CVE-2025-40158

ipv6: use RCU in ip6_output()

State: Published
Severity: 8.1 High
Published: Nov 12, 2025
Updated: Oct 30, 2026
Reserved: Apr 16, 2025

Read the record on cve.org

Description

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().

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 4549ce1057363c8dc072f40c6aa591c279eafed2Affected 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 423895685f367b5a0a956bd14b02df0192bded4cAffected 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 92803b826e40e49a5e8a6e208f4b4574e9d19426Affected 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 0393f85c3241c19ba8550f04a812e7d19f6b3082Affected 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 11709573cc4e48dc34c80fc7ab9ce5b159e29695Affected
LinuxLinux	4.13Affected before 4.13Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.113 through 6.12.Not affected 6.17.3 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 4549ce1057363c8dc072f40c6aa591c279eafed2Affected
4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 423895685f367b5a0a956bd14b02df0192bded4cAffected
4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 92803b826e40e49a5e8a6e208f4b4574e9d19426Affected
4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 0393f85c3241c19ba8550f04a812e7d19f6b3082Affected
4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 to before 11709573cc4e48dc34c80fc7ab9ce5b159e29695Affected

LinuxLinux

4.13Affected
before 4.13Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.113 through 6.12.*Not affected
6.17.3 through 6.17.*Not affected
6.18 and laterNot affected

References

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