CVE-2023-52503
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116Patch
- https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0cePatch
- https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05cPatch
- https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27Patch
- https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8fPatch
- https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116Patch
- https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0cePatch
- https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05cPatch
- https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27Patch
- https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8fPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.