CVE-2024-50086

ksmbd: fix user-after-free from session log off

HIGH

CVSS Score

Published: October 29, 2024 at 12:50 AM UTC

Updated: August 5, 2026 at 12:05 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v < 6.1.1145.15 ≤ v < 5.15.1715.15 ≤ v < 6.1.1145.15 ≤ v < 6.11.55.15 ≤ v < 6.125.15 ≤ v < 6.6.586.2 ≤ v < 6.6.586.7 ≤ v < 6.11.56.12 rc1 6.12 rc2 6.12 rc3626e6641f6b467447c81dd7678a69c66f7746cf

Vendor states this is fixed in 0f62358ce85b2d4c949ef1b648be01b29cec667a (fixed)

Vendor states this is fixed in 5511999e9615e4318e9142d23b29bd1597befc08 (fixed)

Vendor states this is fixed in 7aa8804c0b67b3cb263a472d17f2cb50d7f1a930 (fixed)

Vendor states this is fixed in a9839c37fd813b432988f58a9d9dd59253d3eb2c (fixed)

Vendor states this is fixed in ee371898b53a9b9b51c02d22a8c31bfb86d45f0d (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 5.15.171 (unaffected)

Vendor states this is fixed in 6.1.114 (unaffected)

Vendor states this is fixed in 6.11.5 (unaffected)

Vendor states this is fixed in 6.12 (unaffected)

Vendor states this is fixed in 6.6.58 (unaffected)