Linearize skb before ND option parsing in Linux kernel bridge (br_nd_send)
CVE-2026-31682 Published on April 25, 2026
bridge: br_nd_send: linearize skb before parsing ND options
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.
Products Associated with CVE-2026-31682
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Affected Versions
Linux:- Version ed842faeb2bd49256f00485402f3113205f91d30 and below c68433fd291c9e88c00292095172c62d1997d662 is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below 4f397b950c916e9a1f8a4fce04ea0110206cad47 is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below bd91ec85aa4c77d645bd2739fc56784157a88ca2 is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below 658261898130da620fc3d0fbb0523efb3366cb55 is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below 2ba4caba423ed94d63006eb1d2227b0332ab7fcd is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below 9c55e41c73af5c4511070933b1bd25248521270c is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below 3a30f6469b058574f49efde61cd6f5d79e576053 is affected.
- Version ed842faeb2bd49256f00485402f3113205f91d30 and below a01aee7cafc575bb82f5529e8734e7052f9b16ea is affected.
- Version 4.15 is affected.
- Before 4.15 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.168, <= 6.1.* is unaffected.
- Version 6.6.134, <= 6.6.* is unaffected.
- Version 6.12.81, <= 6.12.* is unaffected.
- Version 6.18.22, <= 6.18.* is unaffected.
- Version 6.19.12, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.