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Debian: CVE-2023-52503: linux -- security update

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Debian: CVE-2023-52503: linux -- security update

Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
03/02/2024
Created
07/31/2024
Added
07/30/2024
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: tee: amdtee: fix use-after-free vulnerability in amdtee_close_session There is a potential race condition in amdtee_close_session that may cause use-after-free in amdtee_open_session. For instance, if a session has refcount == 1, and one thread tries to free this session via: kref_put(&sess->refcount, destroy_session); the reference count will get decremented, and the next step would be to call destroy_session(). However, if in another thread, amdtee_open_session() is called before destroy_session() has completed execution, alloc_session() may return 'sess' that will be freed up later in destroy_session() leading to use-after-free in amdtee_open_session. To fix this issue, treat decrement of sess->refcount and removal of 'sess' from session list in destroy_session() as a critical section, so that it is executed atomically.

Solution(s)

  • debian-upgrade-linux

References

  • https://attackerkb.com/topics/cve-2023-52503
  • CVE - 2023-52503
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