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Vulnerability record · CVE-2026-53273 · published 25 June 2026

CVE-2026-53273: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: tee: optee: prevent use-after-free when the client exits before the supplicant Commit 70b0d6b0a199 ("tee: optee: Fix supplicant wait loop") made the client wait as killable so it can be interrupted during shutdown or after a supplicant crash. This changes the original lifetime expectations: the client task can now terminate while the supplicant is still processing its request. If the client exits first it removes the request from its queue and kfree()s it, while the request ID remains in supp->idr. A subsequent lookup on the supplicant path then dereferences freed memory, leading to a use-after-free. Serialise access to the request with supp->mutex: * Hold supp->mutex in optee_supp_recv() and optee_supp_send() while looking up and touching the request. * Let optee_supp_thrd_req() notice that the client has terminated and signal optee_supp_send() accordingly. With these changes the request cannot be freed while the supplicant still has a reference, eliminating the race.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.5% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: tee: optee: prevent use-after-free when the client exits before the supplicant Commit 70b0d6b0a199 ("tee: optee: Fix supplicant wait loop") made the client wait as killable so it can be interrupted during shutdown or after a supplicant crash. This changes the original lifetime expectations: the client task can now terminate while the supplicant is still processing its request. If the client exits first it removes the request from its queue and kfree()s it, while the request ID remains in supp->idr. A subsequent lookup on the supplicant path then dereferences freed memory, leading to a use-after-free. Serialise access to the request with supp->mutex: * Hold supp->mutex in optee_supp_recv() and optee_supp_send() while looking up and touching the request. * Let optee_supp_thrd_req() notice that the client has terminated and signal optee_supp_send() accordingly. With these changes the request cannot be freed while the supplicant still has a reference, eliminating the race.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/373152c94e57e9592b68c100e224fbd943cfd608 Patch
https://git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e Patch
https://git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34 Patch
https://git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1 Patch
https://git.kernel.org/stable/c/9a0dc9279d0907b198f205a693aedf696b08145d Patch
https://git.kernel.org/stable/c/ae847ab29ded2d7cece4d5970f0edefa4137bf2f Patch
https://git.kernel.org/stable/c/d366a01475f927402c96a3fe78bfc06b924fc87d Patch
https://git.kernel.org/stable/c/d5b57bb314d79e99bebb58a53588fa11dd4dbf69 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53273), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.