What’s Vulnerable › Vulnerabilities

CVE-2024-50086: ksmbd: fix user-after-free from session log off

• Severity: high (CVSS 7.0 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: 2024-10-29 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix user-after-free from session log off There is racy issue between smb2 session log off and smb2 session setup. It will cause user-after-free from session log off. This add session_lock when setting SMB2_SESSION_EXPIRED and referece count to session struct not to free session while it is being used.

Affected products

• Linux kernel: before 6.1.114; from 6.2 before 6.6.58; from 6.7 before 6.11.5; 6.12-rc1, 6.12-rc2, 6.12-rc3 — fixed in 6.1.114, 6.11.5, 6.6.58

How to fix

Upgrade to a fixed version: Linux kernel 6.1.114, 6.11.5, 6.6.58. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f62358ce85b2d4c949ef1b648be01b29cec667a
• https://git.kernel.org/stable/c/5511999e9615e4318e9142d23b29bd1597befc08
• https://git.kernel.org/stable/c/7aa8804c0b67b3cb263a472d17f2cb50d7f1a930
• https://git.kernel.org/stable/c/a9839c37fd813b432988f58a9d9dd59253d3eb2c
• https://git.kernel.org/stable/c/ee371898b53a9b9b51c02d22a8c31bfb86d45f0d
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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