bridge: br_nd_send: validate ND option lengths

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Summary

CVECVE-2026-31752
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:38 UTC
Updated2026-05-07 19:08:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

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: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

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 ed842faeb2bd49256f00485402f3113205f91d30 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 259466f76f5a2148aff11134e68f4b4c6d52725b git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 c49b9256bbacb6a135654aebd12e4c0e87166b7c git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 837392a38445729c22e03d3abcf33f07763efd85 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 e71303a9190496136e240c4f2872b7b0b16027a7 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 850837965af15707fd3142c1cf3c5bfaf022299b git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c49b9256bbacb6a135654aebd12e4c0e87166b7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e71303a9190496136e240c4f2872b7b0b16027a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/259466f76f5a2148aff11134e68f4b4c6d52725b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/850837965af15707fd3142c1cf3c5bfaf022299b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/837392a38445729c22e03d3abcf33f07763efd85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82a42eceec7c6bdb0e0da94c0542a173b7ea57f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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