CVE-2026-31682

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < c68433fd291c9e88c00292095172c62d1997d662affected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < 4f397b950c916e9a1f8a4fce04ea0110206cad47affected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < bd91ec85aa4c77d645bd2739fc56784157a88ca2affected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < 658261898130da620fc3d0fbb0523efb3366cb55affected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < 2ba4caba423ed94d63006eb1d2227b0332ab7fcdaffected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < 9c55e41c73af5c4511070933b1bd25248521270caffected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < 3a30f6469b058574f49efde61cd6f5d79e576053affected
LinuxLinuxed842faeb2bd49256f00485402f3113205f91d30 < a01aee7cafc575bb82f5529e8734e7052f9b16eaaffected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References