High 8.1Published Nov 12, 2025

CVE-2025-40158ipv6: use RCU in ip6_output()

Updated under an hour ago (Oct 27, 2026, 3:10 AM ET)

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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: ipv6: use RCU in ip6_output() Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent possible UAF. We can remove rcu_read_lock()/rcu_read_unlock() pairs from ip6_finish_output2().

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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: Deferred
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 before 423895685f367b5a0a956bd14b02df0192bded4c; from 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 before 92803b826e40e49a5e8a6e208f4b4574e9d19426; from 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 before 0393f85c3241c19ba8550f04a812e7d19f6b3082; from 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 before 11709573cc4e48dc34c80fc7ab9ce5b159e29695	CNA record

References

References

https://git.kernel.org/stable/c/423895685f367b5a0a956bd14b02df0192bded4c
https://git.kernel.org/stable/c/92803b826e40e49a5e8a6e208f4b4574e9d19426
https://git.kernel.org/stable/c/0393f85c3241c19ba8550f04a812e7d19f6b3082
https://git.kernel.org/stable/c/11709573cc4e48dc34c80fc7ab9ce5b159e29695

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.