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CVE-2025-22040: ksmbd: fix session use-after-free in multichannel connection

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-16 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix session use-after-free in multichannel connection There is a race condition between session setup and ksmbd_sessions_deregister. The session can be freed before the connection is added to channel list of session. This patch check reference count of session before freeing it.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.15 before 6.1.134; from 6.2 before 6.6.87; from 6.7 before 6.12.23; from 6.13 before 6.13.11; from 6.14 before 6.14.2 — fixed in 6.1.134, 6.12.23, 6.13.11, 6.14.2, 6.6.87

How to fix

Upgrade to a fixed version: Linux kernel 6.1.134, 6.12.23, 6.13.11, 6.14.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737
• https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f
• https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd
• https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d
• https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b
• https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

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