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Vulnerability record · CVE-2026-31682 · published 25 April 2026

CVE-2026-31682: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.1 CVSS 3.1 Critical EPSS 0.85% · top 43.7%
9.1CVSS 3.1 base score
0.85%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
14 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd Patch
https://git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053 Patch
https://git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47 Patch
https://git.kernel.org/stable/c/658261898130da620fc3d0fbb0523efb3366cb55 Patch
https://git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c Patch
https://git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea Patch
https://git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2 Patch
https://git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2026-31682), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.