{"id":"CVE-2023-52503","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\n\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdt…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\n\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdt…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.6, < 5.10.199","linux_kernel >= 5.11, < 5.15.136","linux_kernel >= 5.16, < 6.1.59","linux_kernel >= 6.2, < 6.5.8","linux_kernel = 6.6"],"patched":["linux_kernel 6.5.8"],"published":"2024-03-02","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-52503","references":[{"url":"https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/1c95574350cd63bc3c5c2fa06658010768f2a0ce","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/60c3e7a00db954947c265b55099c21b216f2a05c","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/da7ce52a2f6c468946195b116615297d3d113a27","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/f4384b3e54ea813868bb81a861bf5b2406e15d8f","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00258,"epssPercentile":0.17786,"ingestedAt":"2026-08-04T10:39:40.009Z","slug":"CVE-2023-52503","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\n\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdtee_open_session. For instance, if a session\nhas refcount == 1, and one thread tries to free this session via:\n\n    kref_put(&sess->refcount, destroy_session);\n\nthe reference count will get decremented, and the next step would be to\ncall destroy_session(). However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\n\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically.\n\n## Affected\n\n- `linux_kernel >= 5.6, < 5.10.199`\n- `linux_kernel >= 5.11, < 5.15.136`\n- `linux_kernel >= 5.16, < 6.1.59`\n- `linux_kernel >= 6.2, < 6.5.8`\n- `linux_kernel = 6.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.8`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}