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CVE-2025-22074: ksmbd: fix r_count dec/increment mismatch

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-16 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix r_count dec/increment mismatch r_count is only increased when there is an oplock break wait, so r_count inc/decrement are not paired. This can cause r_count to become negative, which can lead to a problem where the ksmbd thread does not terminate.

Affected products

• Linux kernel: from 6.6.84 before 6.6.87; from 6.12.20 before 6.12.23; from 6.13.8 before 6.13.11; 6.14-rc7; 6.14; 6.14.1 (and their updates) — fixed in 6.6.87, 6.12.23, 6.13.11
• Linux: from 6.6.84 before 6.6.87; from 6.12.20 before 6.12.23; from 6.13.8 before 6.13.11 — fixed in 6.6.87, 6.12.23, 6.13.11

How to fix

Upgrade to a fixed version: Linux kernel 6.6.87, 6.12.23, 6.13.11; Linux 6.6.87, 6.12.23, 6.13.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/20378cf48359f39dee0ef9b61470ebe77bd49c0d
• https://git.kernel.org/stable/c/457db486203c90e10c3efc87fd45cc7000b1cd36
• https://git.kernel.org/stable/c/4790bcb269e5d6d88200a67c54ae6d627332a3be
• https://git.kernel.org/stable/c/8829849da3f68697b830a5b36047b0d8a50ae3ed
• https://git.kernel.org/stable/c/c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9
• https://git.kernel.org/stable/c/ddb7ea36ba7129c2ed107e2186591128618864e1

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