CVE-2026-31682

bridge: br_nd_send: linearize skb before parsing ND options

State: Published
Severity: 9.1 Critical
Published: Apr 25, 2026
Updated: Oct 19, 2026
Reserved: Mar 9, 2026

Description

In 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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	ed842faeb2bd49256f00485402f3113205f91d30 to before c68433fd291c9e88c00292095172c62d1997d662Affected ed842faeb2bd49256f00485402f3113205f91d30 to before 4f397b950c916e9a1f8a4fce04ea0110206cad47Affected ed842faeb2bd49256f00485402f3113205f91d30 to before bd91ec85aa4c77d645bd2739fc56784157a88ca2Affected ed842faeb2bd49256f00485402f3113205f91d30 to before 658261898130da620fc3d0fbb0523efb3366cb55Affected ed842faeb2bd49256f00485402f3113205f91d30 to before 2ba4caba423ed94d63006eb1d2227b0332ab7fcdAffected ed842faeb2bd49256f00485402f3113205f91d30 to before 9c55e41c73af5c4511070933b1bd25248521270cAffected ed842faeb2bd49256f00485402f3113205f91d30 to before 3a30f6469b058574f49efde61cd6f5d79e576053Affected ed842faeb2bd49256f00485402f3113205f91d30 to before a01aee7cafc575bb82f5529e8734e7052f9b16eaAffected
LinuxLinux	4.15Affected before 4.15Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

ed842faeb2bd49256f00485402f3113205f91d30 to before c68433fd291c9e88c00292095172c62d1997d662Affected
ed842faeb2bd49256f00485402f3113205f91d30 to before 4f397b950c916e9a1f8a4fce04ea0110206cad47Affected
ed842faeb2bd49256f00485402f3113205f91d30 to before bd91ec85aa4c77d645bd2739fc56784157a88ca2Affected
ed842faeb2bd49256f00485402f3113205f91d30 to before 658261898130da620fc3d0fbb0523efb3366cb55Affected
ed842faeb2bd49256f00485402f3113205f91d30 to before 2ba4caba423ed94d63006eb1d2227b0332ab7fcdAffected
ed842faeb2bd49256f00485402f3113205f91d30 to before 9c55e41c73af5c4511070933b1bd25248521270cAffected
ed842faeb2bd49256f00485402f3113205f91d30 to before 3a30f6469b058574f49efde61cd6f5d79e576053Affected
ed842faeb2bd49256f00485402f3113205f91d30 to before a01aee7cafc575bb82f5529e8734e7052f9b16eaAffected

LinuxLinux

4.15Affected
before 4.15Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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