Medium 5.5Published May 1, 2026

CVE-2026-31752bridge: br_nd_send: validate ND option lengths

Updated under an hour ago (Oct 27, 2026, 5:20 PM ET)

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

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
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 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ed842faeb2bd49256f00485402f3113205f91d30 before 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2; from ed842faeb2bd49256f00485402f3113205f91d30 before 259466f76f5a2148aff11134e68f4b4c6d52725b; from ed842faeb2bd49256f00485402f3113205f91d30 before ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a; from ed842faeb2bd49256f00485402f3113205f91d30 before e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa; from ed842faeb2bd49256f00485402f3113205f91d30 before c49b9256bbacb6a135654aebd12e4c0e87166b7c; from ed842faeb2bd49256f00485402f3113205f91d30 before 837392a38445729c22e03d3abcf33f07763efd85; from ed842faeb2bd49256f00485402f3113205f91d30 before e71303a9190496136e240c4f2872b7b0b16027a7; from ed842faeb2bd49256f00485402f3113205f91d30 before 850837965af15707fd3142c1cf3c5bfaf022299b	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/82a42eceec7c6bdb0e0da94c0542a173b7ea57f2	patch
https://git.kernel.org/stable/c/259466f76f5a2148aff11134e68f4b4c6d52725b	patch
https://git.kernel.org/stable/c/ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a	patch
https://git.kernel.org/stable/c/e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa	patch
https://git.kernel.org/stable/c/c49b9256bbacb6a135654aebd12e4c0e87166b7c	patch
https://git.kernel.org/stable/c/837392a38445729c22e03d3abcf33f07763efd85	patch
https://git.kernel.org/stable/c/e71303a9190496136e240c4f2872b7b0b16027a7	patch
https://git.kernel.org/stable/c/850837965af15707fd3142c1cf3c5bfaf022299b	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.