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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00172.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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Vendors Products
References
Link Providers
https://git.kernel.org/stable/c/373152c94e57e9592b68c100e224fbd943cfd608 cve-icon
https://git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e cve-icon
https://git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34 cve-icon
https://git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1 cve-icon
https://git.kernel.org/stable/c/9a0dc9279d0907b198f205a693aedf696b08145d cve-icon
https://git.kernel.org/stable/c/ae847ab29ded2d7cece4d5970f0edefa4137bf2f cve-icon
https://git.kernel.org/stable/c/d366a01475f927402c96a3fe78bfc06b924fc87d cve-icon
https://git.kernel.org/stable/c/d5b57bb314d79e99bebb58a53588fa11dd4dbf69 cve-icon
History

Thu, 25 Jun 2026 12:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
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.
Title tee: optee: prevent use-after-free when the client exits before the supplicant
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:39:57.811Z

Reserved: 2026-06-09T07:44:35.395Z

Link: CVE-2026-53273

cve-icon Vulnrichment

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cve-icon NVD

No data.

cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-25T11:45:03Z