CVE-2023-52503: tee: amdtee: fix use-after-free vulnerability in amdtee_close_session

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-08-04
Weakness: CWE-416

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.

Affected products

Linux kernel: from 5.6 before 5.10.199; from 5.11 before 5.15.136; from 5.16 before 6.1.59; from 6.2 before 6.5.8; 6.6-rc1, 6.6-rc2, 6.6-rc3, 6.6-rc4, 6.6-rc5 — fixed in 5.10.199, 5.15.136, 6.1.59, 6.5.8

How to fix

Upgrade to a fixed version: Linux kernel 5.10.199, 5.15.136, 6.1.59, 6.5.8. Check the vendor advisory for mitigations.

References

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