CVE-2026-31682 PUBLISHED

bridge: br_nd_send: linearize skb before parsing ND options

Assigner: Linux
Reserved: 09.03.2026 Published: 25.04.2026 Updated: 27.04.2026

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.

Metrics

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

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to c68433fd291c9e88c00292095172c62d1997d662 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 4f397b950c916e9a1f8a4fce04ea0110206cad47 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to bd91ec85aa4c77d645bd2739fc56784157a88ca2 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 658261898130da620fc3d0fbb0523efb3366cb55 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 2ba4caba423ed94d63006eb1d2227b0332ab7fcd (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 9c55e41c73af5c4511070933b1bd25248521270c (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to 3a30f6469b058574f49efde61cd6f5d79e576053 (excl.)
  • affected from ed842faeb2bd49256f00485402f3113205f91d30 to a01aee7cafc575bb82f5529e8734e7052f9b16ea (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.15 is affected
  • unaffected from 0 to 4.15 (excl.)
  • unaffected from 5.10.253 to 5.10.* (incl.)
  • unaffected from 5.15.203 to 5.15.* (incl.)
  • unaffected from 6.1.168 to 6.1.* (incl.)
  • unaffected from 6.6.134 to 6.6.* (incl.)
  • unaffected from 6.12.81 to 6.12.* (incl.)
  • unaffected from 6.18.22 to 6.18.* (incl.)
  • unaffected from 6.19.12 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References