High 7.8Published Feb 26, 2025

CVE-2025-21763neighbour: use RCU protection in __neigh_notify()

Updated under an hour ago (Oct 26, 2026, 6:10 PM ET)

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It affects Linux and 2 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: neighbour: use RCU protection in __neigh_notify() __neigh_notify() can be called without RTNL or RCU protection. Use RCU protection to avoid potential UAF.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
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 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 426b5303eb435d98b9bee37a807be386bc2b3320 before e1aed6be381bcd7f46d4ca9d7ef0f5f3d6a1be32; from 426b5303eb435d98b9bee37a807be386bc2b3320 before 8666e9aab801328c1408a19fbf4070609dc0695a; 426b5303eb435d98b9bee37a807be386bc2b3320 builds before 40d8f2f2a373b6c294ffac394d2bb814b572ead1; from 426b5303eb435d98b9bee37a807be386bc2b3320 before 784eb2376270e086f7db136d154b8404edacf97b; 426b5303eb435d98b9bee37a807be386bc2b3320 builds before 1cbb2aa90cd3fba15ad7efb5cdda28f3d1082379; from 426b5303eb435d98b9bee37a807be386bc2b3320 before cdd5c2a12ddad8a77ce1838ff9f29aa587de82df; from 426b5303eb435d98b9bee37a807be386bc2b3320 before 559307d25235e24b5424778c7332451b6c741159; from 426b5303eb435d98b9bee37a807be386bc2b3320 before becbd5850c03ed33b232083dd66c6e38c0c0e569	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.25 before 5.4.291; from 5.5 before 5.10.235; from 5.11 before 5.15.179; from 5.16 before 6.1.129; from 6.2 before 6.6.79; from 6.7 before 6.12.16; from 6.13 before 6.13.4; 6.14; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/e1aed6be381bcd7f46d4ca9d7ef0f5f3d6a1be32	patch
https://git.kernel.org/stable/c/8666e9aab801328c1408a19fbf4070609dc0695a	patch
https://git.kernel.org/stable/c/40d8f2f2a373b6c294ffac394d2bb814b572ead1	patch
https://git.kernel.org/stable/c/784eb2376270e086f7db136d154b8404edacf97b	patch
https://git.kernel.org/stable/c/1cbb2aa90cd3fba15ad7efb5cdda28f3d1082379	patch
https://git.kernel.org/stable/c/cdd5c2a12ddad8a77ce1838ff9f29aa587de82df	patch
https://git.kernel.org/stable/c/559307d25235e24b5424778c7332451b6c741159	patch
https://git.kernel.org/stable/c/becbd5850c03ed33b232083dd66c6e38c0c0e569	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.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.