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Full vulnerability report · 2025
CVE-2022-49776High confidence

macvlan: enforce a consistent minimal mtu

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.

2 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 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 9 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 9 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-2025-12996

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
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
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: macvlan: enforce a consistent minimal mtu macvlan should enforce a minimal mtu of 68, even at link creation. This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up) $ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

What

In the Linux kernel, the following vulnerability has been resolved: macvlan: enforce a consistent minimal mtu macvlan should enforce a minimal mtu of 68, even at link creation. This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up) $ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

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 disrupt the affected service.

What

In the Linux kernel, the following vulnerability has been resolved: macvlan: enforce a consistent minimal mtu macvlan should enforce a minimal mtu of 68, even at link creation. This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up) $ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

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 disrupt the affected service.

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 → disrupt the affected service
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.
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: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.
Denial of service
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2026-AVI-0081Multiples vulnérabilités dans le noyau Linux de SUSE

rd?id=CVE-2022-4662 Référence CVE CVE-2022-49110 https://www.cve.org/CVERecord?id=CVE-2022-49110 Référence CVE CVE-2022-49139 https://www.cve.org/CVERecord?id=CVE-2022-49139 Référence CVE CVE-2022-49767 https://www.cve.org/CVERecord?id=CVE-2022-49767 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=CVE-2022-49788 Référence CVE CVE-2022-49789 https://www.cve.org/CVERecord?id=CVE-2022-49789 Référence CVE CVE-2022-49790 https://www.cve.org/CVERecord?id=CVE-2022-49790 Référence CVE CVE-2022-49792 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-1009Multiples vulnérabilités dans le noyau Linux de SUSE

rd?id=CVE-2022-4662 Référence CVE CVE-2022-49762 https://www.cve.org/CVERecord?id=CVE-2022-49762 Référence CVE CVE-2022-49763 https://www.cve.org/CVERecord?id=CVE-2022-49763 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49773 https://www.cve.org/CVERecord?id=CVE-2022-49773 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49781 https://www.cve.org/CVERecord?id=CVE-2022-49781 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49784 https://www.cve.org/CVERecord?id=CVE-2022-49784 Référence CVE CVE-2022-49786 https://www.cve.org/CVERecord?id=CVE-2022-49786 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0587Multiples vulnérabilités dans le noyau Linux de SUSE

rd?id=CVE-2022-4662 Référence CVE CVE-2022-49110 https://www.cve.org/CVERecord?id=CVE-2022-49110 Référence CVE CVE-2022-49139 https://www.cve.org/CVERecord?id=CVE-2022-49139 Référence CVE CVE-2022-49767 https://www.cve.org/CVERecord?id=CVE-2022-49767 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=CVE-2022-49788 Référence CVE CVE-2022-49789 https://www.cve.org/CVERecord?id=CVE-2022-49789 Référence CVE CVE-2022-49790 https://www.cve.org/CVERecord?id=CVE-2022-49790 Référence CVE CVE-2022-49792 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0560Multiples vulnérabilités dans le noyau Linux de SUSE

rd?id=CVE-2022-3640 Référence CVE CVE-2022-49762 https://www.cve.org/CVERecord?id=CVE-2022-49762 Référence CVE CVE-2022-49763 https://www.cve.org/CVERecord?id=CVE-2022-49763 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49773 https://www.cve.org/CVERecord?id=CVE-2022-49773 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49781 https://www.cve.org/CVERecord?id=CVE-2022-49781 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49784 https://www.cve.org/CVERecord?id=CVE-2022-49784 Référence CVE CVE-2022-49786 https://www.cve.org/CVERecord?id=CVE-2022-49786 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0529Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2022-49762 Référence CVE CVE-2022-49763 https://www.cve.org/CVERecord?id=CVE-2022-49763 Référence CVE CVE-2022-49767 https://www.cve.org/CVERecord?id=CVE-2022-49767 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49773 https://www.cve.org/CVERecord?id=CVE-2022-49773 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49781 https://www.cve.org/CVERecord?id=CVE-2022-49781 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49784 https://www.cve.org/CVERecord?id=CVE-2022-49784 Référence CVE CVE-2022-49786 https://www.cve.org/CVERecord?id=CVE-2022-49786 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0509Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2022-49139 Référence CVE CVE-2022-49563 https://www.cve.org/CVERecord?id=CVE-2022-49563 Référence CVE CVE-2022-49564 https://www.cve.org/CVERecord?id=CVE-2022-49564 Référence CVE CVE-2022-49767 https://www.cve.org/CVERecord?id=CVE-2022-49767 Référence CVE CVE-2022-49769 https://www.cve.org/CVERecord?id=CVE-2022-49769 Référence CVE CVE-2022-49770 https://www.cve.org/CVERecord?id=CVE-2022-49770 Référence CVE CVE-2022-49771 https://www.cve.org/CVERecord?id=CVE-2022-49771 Référence CVE CVE-2022-49772 https://www.cve.org/CVERecord?id=CVE-2022-49772 Référence CVE CVE-2022-49775 https://www.cve.org/CVERecord?id=CVE-2022-49775 Référence CVE CVE-2022-49776 https://www.cve.org/CVERecord?id=CVE-2022-49776 Référence CVE CVE-2022-49777 https://www.cve.org/CVERecord?id=CVE-2022-49777 Référence CVE CVE-2022-49779 https://www.cve.org/CVERecord?id=CVE-2022-49779 Référence CVE CVE-2022-49783 https://www.cve.org/CVERecord?id=CVE-2022-49783 Référence CVE CVE-2022-49787 https://www.cve.org/CVERecord?id=CVE-2022-49787 Référence CVE CVE-2022-49788 https://www.cve.org/CVERecord?id=CVE-2022-49788 Référence CVE CVE-2022-49789 https://www.cve.org/CVERecord?id=CVE-2022-49789 Référence CVE CVE-2022-49790 https://www.cve.org/CVERecord?id=CVE-2022-49790 Référence CVE CVE-2022-49792 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
91572088e3fdbf4fe31cf397926d8b890fdb3237 < d2fee7d121d189c6dc905b727d60e7043a6655bb; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < 650137a7c0b2892df2e5b0bc112d7b09a78c93c8; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < a62aa84fe19eb24d083d600a074c009a0a66d4f3; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < e929ec98c0c3b10d9c07f3776df0c1a02d7a763e; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < e41cbf98df22d08402e65174d147cbb187fe1a33; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < 2b055c719d8f94c15ec9b7659978133030c6a353; 91572088e3fdbf4fe31cf397926d8b890fdb3237 < b64085b00044bdf3cd1c9825e9ef5b2e0feae91a; 4.10
Fixed
< 4.10; 4.14.300 ≤ 4.14.*; 4.19.267 ≤ 4.19.*; 5.4.225 ≤ 5.4.*; 5.10.156 ≤ 5.10.*; 5.15.80 ≤ 5.15.*; 6.0.10 ≤ 6.0.*; 6.1 ≤ *
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 1 May 2025 · Last source change 11 May 2026, 19:06 UTC · CWE not yet assigned

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-2025-12996
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD enriched

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 →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2025-12996↗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.
Free version - for non-commercial use only.CVE-2022-49776 · cve.blacktree.nl