BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-64427High confidence

HID: logitech-dj: Fix maxfield check in DJ short report validation

Linux · Linux

5.5MediumCVSS 3.1

Recommended action

Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available

Distribution package intelligence

Ubuntu vendor package status

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

13 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 release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · standard archive	`linux-aws-6.14`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-azure-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-azure-fde-6.14`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-azure-nvidia-6.14`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-gcp-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-hwe-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-lowlatency-hwe-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-nvidia-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-oem-6.11`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-oracle-6.14`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-raspi-realtime`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-realtime`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026
Ubuntu 24.04 LTSnoble · standard archive	`linux-riscv`	Affected, 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 feed`	Canonical record ↗Source updated 9 Sept 2026

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-2026-48771

No EUVD known-exploited evidence

In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix maxfield check in DJ short report validation Commit b6a57912854e ("HID: logitech-dj: Prevent REPORT_ID_DJ_SHORT related user initiated OOB write") added validation for the DJ short output report, but the error path dereferences rep->field[0] even when rep->maxfield is zero. Commit 8b9a097eb2fc ("HID: logitech-dj: fix wrong detection of bad DJ_SHORT output report") made the check conditional on rep being present, but a crafted descriptor can still create report ID 0x20 with only padding output items. hid-core registers the report, ignores the padding field, and leaves rep->maxfield as zero. In that case the validation enters the rep->maxfield < 1 branch and then dereferences rep->field[0]->report_count while printing the error message, causing a NULL pointer dereference during probe. This is reproducible with uhid by emulating a Logitech receiver with a padding-only DJ short output report: BUG: KASAN: null-ptr-deref in logi_dj_probe+0xb1/0x754 [hid_logitech_dj] Read of size 4 at addr 0000000000000028 by task kworker/4:1/129 ... Call Trace: logi_dj_probe+0xb1/0x754 [hid_logitech_dj] hid_device_probe+0x329/0x3f0 [hid] really_probe+0x162/0x570 __device_attach+0x137/0x2c0 bus_probe_device+0x38/0xc0 device_add+0xa56/0xce0 hid_add_device+0x19c/0x280 [hid] uhid_device_add_worker+0x2c/0xb0 [uhid] Reject the zero-field report before printing the field report_count.

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: 0.0
Advisory evidence: No linked advisory details stored yet

Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available

What, why and how

What

Why

The product dereferences a pointer that it expects to be valid but is NULL.

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

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

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 → NULL Pointer Dereference → 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: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-476 ↗
CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.
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:U/C:N/I:N/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.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.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.

CWE-476

Official authority intelligence

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

ENISA EUVD · EUVD-2026-48771Official EUVD mapping

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

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: 7754ade02d0fb1caf20392baf4e02937378fd136 < f3790a6af9c7f47d454225cab9dc145270e48f62; 2ed9638cfbf9d49bdef9b0f5ee547236c2c2f500 < 1215febd644c3e16f77e0f1799d89544dd57a754; eeb5ad388595ca2b6624689198a057847f3a3e19 < 6f7f22a8d244c2e586b8eb61c7585784b62aea01; 968e84f5c0dca4960580d174500e4bbf0c45dc15 < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872; ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500; bc3bba4656ad280267ea78cf845ab6b1d95b9fcd < 2b70bebc709489d29a31ac2935aeffb8d5228395; b6a57912854e7ea36f3b270032661140cc4209cd < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f; b6a57912854e7ea36f3b270032661140cc4209cd < 590cc4d782487632a52f37c2171bee1eeea29627
Fixed: < 7.1; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
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.

Evidence and provenance

Published 25 Jul 2026 · Last source change 19 Aug 2026, 16:28 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.2

CVSS sourceNIST NVD

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-2026-48771

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

19 Aug 2026, 16:28 UTC
Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link · patch.
Before
authoritative remediation link
After
authoritative remediation link · patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 ↗
19 Aug 2026, 16:28 UTC
SeveritySeverity changed from Unknown to Medium.
Before
Unknown
After
Medium
NIST NVD ↗
19 Aug 2026, 16:28 UTC
CVSS scoreCVSS score changed from not recorded to 5.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Before
not recorded
After
5.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
NIST NVD ↗
19 Aug 2026, 16:28 UTC
Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link.
Before
authoritative remediation link
After
authoritative remediation link
CNA ↗
19 Aug 2026, 16:28 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
968e84f5c0dca4960580d174500e4bbf0c45dc15 < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872; ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500; bc3bba4656ad280267ea78cf845ab6b1d95b9fcd < 2b70bebc709489d29a31ac2935aeffb8d5228395; b6a57912854e7ea36f3b270032661140cc4209cd < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f; b6a57912854e7ea36f3b270032661140cc4209cd < 590cc4d782487632a52f37c2171bee1eeea29627; 7.1 · Fixed: < 7.1; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
After
7754ade02d0fb1caf20392baf4e02937378fd136 < f3790a6af9c7f47d454225cab9dc145270e48f62; 2ed9638cfbf9d49bdef9b0f5ee547236c2c2f500 < 1215febd644c3e16f77e0f1799d89544dd57a754; eeb5ad388595ca2b6624689198a057847f3a3e19 < 6f7f22a8d244c2e586b8eb61c7585784b62aea01; 968e84f5c0dca4960580d174500e4bbf0c45dc15 < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872; ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500; bc3bba4656ad280267ea78cf845ab6b1d95b9fcd < 2b70bebc709489d29a31ac2935aeffb8d5228395; b6a57912854e7ea36f3b270032661140cc4209cd < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f; b6a57912854e7ea36f3b270032661140cc4209cd < 590cc4d782487632a52f37c2171bee1eeea29627 · Fixed: < 7.1; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
CNA ↗
17 Aug 2026, 04:55 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
968e84f5c0dca4960580d174500e4bbf0c45dc15 < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872; ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500; bc3bba4656ad280267ea78cf845ab6b1d95b9fcd < 2b70bebc709489d29a31ac2935aeffb8d5228395; b6a57912854e7ea36f3b270032661140cc4209cd < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f; b6a57912854e7ea36f3b270032661140cc4209cd < 590cc4d782487632a52f37c2171bee1eeea29627; 7.1 · Fixed: < 7.1; 7.1.4 ≤ 7.1.*; 7.2-rc3 ≤ *
After
968e84f5c0dca4960580d174500e4bbf0c45dc15 < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872; ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500; bc3bba4656ad280267ea78cf845ab6b1d95b9fcd < 2b70bebc709489d29a31ac2935aeffb8d5228395; b6a57912854e7ea36f3b270032661140cc4209cd < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f; b6a57912854e7ea36f3b270032661140cc4209cd < 590cc4d782487632a52f37c2171bee1eeea29627; 7.1 · Fixed: < 7.1; 7.1.4 ≤ 7.1.*; 7.2 ≤ *
CNA ↗

2026-07-25CVE published

2026-08-19Fixed release or patch reference recorded

ENISA EUVD · EUVD-2026-48771↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗

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.