CVE-2023-52503: Linux Kernel

High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.6, before 5.10.199 (fixed in 5.10.199); from 5.11, before 5.15.136 (fixed in 5.15.136); from 5.16, before 6.1.59 (fixed in 6.1.59); from 6.2, before 6.5.8 (fixed in 6.5.8); version 6.6 only

Published 2024-03-02. Last modified 2026-08-04.