What’s Vulnerable › Vulnerabilities

CVE-2025-38561: ksmbd: fix Preauh_HashValue race condition

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-19 · updated 2026-07-30
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Preauh_HashValue race condition If client send multiple session setup requests to ksmbd, Preauh_HashValue race condition could happen. There is no need to free sess->Preauh_HashValue at session setup phase. It can be freed together with session at connection termination phase.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.15 before 6.1.148; from 6.2 before 6.6.102; from 6.7 before 6.12.42; from 6.13 before 6.15.10; from 6.16 before 6.16.1 — fixed in 6.1.148, 6.12.42, 6.15.10, 6.16.1, 6.6.102

How to fix

Upgrade to a fixed version: Linux kernel 6.1.148, 6.12.42, 6.15.10, 6.16.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6
• https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc
• https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc
• https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829
• https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c
• https://git.kernel.org/stable/c/fbf5c0845ed15122a770bca9be1d9b60b470d3aa
• https://www.zerodayinitiative.com/advisories/ZDI-25-916/
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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