BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2026-64280High confidence

fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()

Linux · Linux

8.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

20 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivelinuxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-awsAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azureAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-fdeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gcpAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeopAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-ibmAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-tegraAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oem-6.11Affected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oracleAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspiAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-riscvAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-xilinxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-48992

No EUVD known-exploited evidence

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
8.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

What

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → vulnerable operation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-48992Official EUVD mapping

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

Official EUVD record
BSI · German · WID-SEC-W-2026-2527Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um nicht näher spezifizierte Angriffe durchzuführen, dazu können DoS-Angriffe, die Offenlegung von Informationen, die Beschädigung des Speichers oder die Umgehung von Sicherheitsmaßnahmen gehören.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1069Multiples vulnérabilités dans le noyau Linux de Debian LTS

ectifs (cf. section Documentation). Documentation Bulletin de sécurité Debian LTS msg00035 du 18 août 2026 https://lists.debian.org/debian-lts-announce/2026/08/msg00035.html Référence CVE CVE-2025-40098 https://www.cve.org/CVERecord?id=CVE-2025-40098 Référence CVE CVE-2026-45897 https://www.cve.org/CVERecord?id=CVE-2026-45897 Référence CVE CVE-2026-45901 https://www.cve.org/CVERecord?id=CVE-2026-45901 Référence CVE CVE-2026-53078 https://www.cve.org/CVERecord?id=CVE-2026-53078 Référence CVE CVE-2026-53090 https://www.cve.org/CVERecord?id=CVE-2026-53090 Référence CVE CVE-2026-64205 https://www.cve.org/CVERecord?id=CVE-2026-64205 Référence CVE CVE-2026-64280 https://www.cve.org/CVERecord?id=CVE-2026-64280 Référence CVE CVE-2026-64290 https://www.cve.org/CVERecord?id=CVE-2026-64290 Référence CVE CVE-2026-64561 https://www.cve.org/CVERecord?id=CVE-2026-64561 Référence CVE CVE-2026-64562 https://www.cve.org/CVERecord?id=CVE-2026-64562 Référence CVE CVE-2026-64563 https://www.cve.org/CVERecord?id=CVE-2026-64563 Référence CVE CVE-2026-64564 https://www.cve.org/CVERecord?id=CVE-2026-64564 Référence CVE CVE-2026-64565 https://www.cve.org/CVERecord?id=CVE-2026-64565 Référence CVE CVE-2026-64567 https://www.cve.org/CVERecord?id=CVE-2026-64567 Référence CVE CVE-2026-64568 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1030Multiples vulnérabilités dans le noyau Linux de Debian

rrectifs (cf. section Documentation). Documentation Bulletin de sécurité Debian msg00326 du 06 août 2026 https://lists.debian.org/debian-security-announce/2026/msg00326.html Référence CVE CVE-2025-40098 https://www.cve.org/CVERecord?id=CVE-2025-40098 Référence CVE CVE-2026-45897 https://www.cve.org/CVERecord?id=CVE-2026-45897 Référence CVE CVE-2026-45901 https://www.cve.org/CVERecord?id=CVE-2026-45901 Référence CVE CVE-2026-53078 https://www.cve.org/CVERecord?id=CVE-2026-53078 Référence CVE CVE-2026-53090 https://www.cve.org/CVERecord?id=CVE-2026-53090 Référence CVE CVE-2026-64205 https://www.cve.org/CVERecord?id=CVE-2026-64205 Référence CVE CVE-2026-64280 https://www.cve.org/CVERecord?id=CVE-2026-64280 Référence CVE CVE-2026-64290 https://www.cve.org/CVERecord?id=CVE-2026-64290 Référence CVE CVE-2026-64561 https://www.cve.org/CVERecord?id=CVE-2026-64561 Référence CVE CVE-2026-64562 https://www.cve.org/CVERecord?id=CVE-2026-64562 Référence CVE CVE-2026-64563 https://www.cve.org/CVERecord?id=CVE-2026-64563 Référence CVE CVE-2026-64564 https://www.cve.org/CVERecord?id=CVE-2026-64564 Référence CVE CVE-2026-64565 https://www.cve.org/CVERecord?id=CVE-2026-64565 Référence CVE CVE-2026-64567 https://www.cve.org/CVERecord?id=CVE-2026-64567 Référence CVE CVE-2026-64568 https://www.cve.org/CVERecord?id=

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
fa8dda1edef9ebc3af467c644c5533ac97171e12 < 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc; fa8dda1edef9ebc3af467c644c5533ac97171e12 < d7e787eee2ea619b6dbb98890472ee73daf2e7fd; fa8dda1edef9ebc3af467c644c5533ac97171e12 < a6a3884ff500f04f3088d6d09eec803cd35331a2; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ff; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27
Fixed
< 4.19; 5.10.266 ≤ 5.10.*; 5.15.217 ≤ 5.15.*; 6.1.184 ≤ 6.1.*; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.39 ≤ 6.18.*; 7.1.4 ≤ 7.1.*
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 25 Jul 2026 · Last source change 23 Aug 2026, 12:45 UTC · CWE not yet assigned

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-48992
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD modified after enrichment

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates →
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    fa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ff; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27; 4.19 · Fixed: < 4.19; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.39 ≤ 6.18.*; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
    After
    fa8dda1edef9ebc3af467c644c5533ac97171e12 < 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc; fa8dda1edef9ebc3af467c644c5533ac97171e12 < d7e787eee2ea619b6dbb98890472ee73daf2e7fd; fa8dda1edef9ebc3af467c644c5533ac97171e12 < a6a3884ff500f04f3088d6d09eec803cd35331a2; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ff; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27 · Fixed: < 4.19; 5.10.266 ≤ 5.10.*; 5.15.217 ≤ 5.15.*; 6.1.184 ≤ 6.1.*; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.39 ≤ 6.18.*; 7.1.4 ≤ 7.1.*
    CNA
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    fa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ff; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27; 4.19 · Fixed: < 4.19; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.39 ≤ 6.18.*; 7.1.4 ≤ 7.1.*; 7.2-rc1 ≤ *
    After
    fa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ff; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231; fa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27; 4.19 · Fixed: < 4.19; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.39 ≤ 6.18.*; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
    CNA
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-64280 · cve.blacktree.nl