Critical 9.1Published Apr 25, 2026

CVE-2026-31682bridge: br_nd_send: linearize skb before parsing ND options

Updated under an hour ago (Oct 27, 2026, 11:40 PM ET)

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It affects Linux and 4 other products. Add what you run to find out whether that includes you.

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Exploited in the last 30 days

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: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ed842faeb2bd49256f00485402f3113205f91d30 before c68433fd291c9e88c00292095172c62d1997d662; from ed842faeb2bd49256f00485402f3113205f91d30 before 4f397b950c916e9a1f8a4fce04ea0110206cad47; from ed842faeb2bd49256f00485402f3113205f91d30 before bd91ec85aa4c77d645bd2739fc56784157a88ca2; from ed842faeb2bd49256f00485402f3113205f91d30 before 658261898130da620fc3d0fbb0523efb3366cb55; from ed842faeb2bd49256f00485402f3113205f91d30 before 2ba4caba423ed94d63006eb1d2227b0332ab7fcd; from ed842faeb2bd49256f00485402f3113205f91d30 before 9c55e41c73af5c4511070933b1bd25248521270c; from ed842faeb2bd49256f00485402f3113205f91d30 before 3a30f6469b058574f49efde61cd6f5d79e576053; from ed842faeb2bd49256f00485402f3113205f91d30 before a01aee7cafc575bb82f5529e8734e7052f9b16ea	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.15 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/c68433fd291c9e88c00292095172c62d1997d662	patch
https://git.kernel.org/stable/c/4f397b950c916e9a1f8a4fce04ea0110206cad47	patch
https://git.kernel.org/stable/c/bd91ec85aa4c77d645bd2739fc56784157a88ca2	patch
https://git.kernel.org/stable/c/658261898130da620fc3d0fbb0523efb3366cb55	patch
https://git.kernel.org/stable/c/2ba4caba423ed94d63006eb1d2227b0332ab7fcd	patch
https://git.kernel.org/stable/c/9c55e41c73af5c4511070933b1bd25248521270c	patch
https://git.kernel.org/stable/c/3a30f6469b058574f49efde61cd6f5d79e576053	patch
https://git.kernel.org/stable/c/a01aee7cafc575bb82f5529e8734e7052f9b16ea	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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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.