net: sched: act_csum: validate nested VLAN headers

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Summary

CVECVE-2026-31684
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:02 UTC
Updated2026-06-01 17:16:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: sched: act_csum: validate nested VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area. If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants. Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing error path.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.046080000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 0410c619e86551677fb79887a38eccad3f5a0725 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 886469b6455611a511aa6013e957e15e50577513 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 a69738efea0996d05a3c7d2178551b891744df1b git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 ec4930979b3f7bbeb7af5744599fc6603a4dba62 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 3d165d975305cf76ff0b10a3c798fb31e5f5f9a5 git Not specified
CNA Linux Linux affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 c842743d073bdd683606cb414eb0ca84465dd834 git Not specified
CNA Linux Linux affected 3764bfae5056e95617b6ee074129297e11710886 git Not specified
CNA Linux Linux affected 4.19.99 4.20 semver Not specified
CNA Linux Linux affected 5.1 Not specified
CNA Linux Linux unaffected 5.1 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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