neigh: let neigh_xmit take skb ownership

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-52981
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:08 UTC
Updated2026-07-14 16:51:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005390000 probability, percentile 0.415790000 (date 2026-07-13)

Problem Types: CWE-401

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/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 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a git Not specified
CNA Linux Linux affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 9247d59ca15bf60a57dca08103f055d8a4340877 git Not specified
CNA Linux Linux affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 0084712e0bee204b284510cdb63182fd5a30c2b7 git Not specified
CNA Linux Linux affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 63063ba60d2dc334e34f1e3f9271d7f3f6f30307 git Not specified
CNA Linux Linux affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 445e45a2c3a078316a62d2d331a570cf34ef5079 git Not specified
CNA Linux Linux affected 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 4438113be604ee67a7bf4f81da6e1cca41332ce4 git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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