CVE-2025-38561 ksmbd: fix Preauh_HashValue race condition

What is CVE-2025-38561?

CVE-2025-38561 is a critical vulnerability in Debian Debian Linux, published on 19 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2025-38561?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-38561?

Apply the vendor's patch.

Is CVE-2025-38561 being exploited?

There is no known exploitation of CVE-2025-38561 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-38561, DEBIAN-CVE-2025-38561, GHSA-6mwh-579p-fgpg, ROOT-OS-DEBIAN-11-CVE-2025-38561, ROOT-OS-DEBIAN-12-CVE-2025-38561, ROOT-OS-DEBIAN-13-CVE-2025-38561 and 2 more.