Bug 2322322 (CVE-2024-50086) - CVE-2024-50086 kernel: ksmbd: fix user-after-free from session log off
Summary: CVE-2024-50086 kernel: ksmbd: fix user-after-free from session log off
Keywords:
Status: NEW
Alias: CVE-2024-50086
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2322383
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-10-29 01:02 UTC by OSIDB Bzimport
Modified: 2024-10-29 08:29 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2024-10-29 01:02:21 UTC 
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.
Comment 1 Michal Findra 2024-10-29 08:16:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102938-CVE-2024-50086-8134@gregkh/T
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