bridge: br_nd_send: linearize skb before parsing ND options

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Summary

CVECVE-2026-31682
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:01 UTC
Updated2026-05-06 21:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000280000 probability, percentile 0.078980000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 c68433fd291c9e88c00292095172c62d1997d662 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 4f397b950c916e9a1f8a4fce04ea0110206cad47 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 bd91ec85aa4c77d645bd2739fc56784157a88ca2 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 658261898130da620fc3d0fbb0523efb3366cb55 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 2ba4caba423ed94d63006eb1d2227b0332ab7fcd git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 9c55e41c73af5c4511070933b1bd25248521270c git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 3a30f6469b058574f49efde61cd6f5d79e576053 git Not specified
CNA Linux Linux affected ed842faeb2bd49256f00485402f3113205f91d30 a01aee7cafc575bb82f5529e8734e7052f9b16ea 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/658261898130da620fc3d0fbb0523efb3366cb55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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