CVE-2026-53273 is a vulnerability in Linux Kernel
Published on June 25, 2026
tee: optee: prevent use-after-free when the client exits before the supplicant
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.
Products Associated with CVE-2026-53273
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 0180cf0373f84fff61b16f8c062553a13dd7cfca and below 416259cb5bffecaaae5f76539deb535a8c1b2c34 is affected.
- Version c0a9a948159153be145f9471435695373904ee6d and below 724d0caffd4204b46f78efe22f18f8338031c6e1 is affected.
- Version ec18520f5edc20a00c34a8c9fdd6507c355e880f and below ae847ab29ded2d7cece4d5970f0edefa4137bf2f is affected.
- Version d61cc1a435e6894bfb0dd3370c6f765d2d12825d and below 9a0dc9279d0907b198f205a693aedf696b08145d is affected.
- Version fd9d2d6124c293e40797a080adf8a9c237efd8b8 and below d366a01475f927402c96a3fe78bfc06b924fc87d is affected.
- Version 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 and below d5b57bb314d79e99bebb58a53588fa11dd4dbf69 is affected.
- Version 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 and below 373152c94e57e9592b68c100e224fbd943cfd608 is affected.
- Version 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 and below 387a926ee166814611acecb960207fe2f3c4fd3e is affected.
- Version 3eb4911364c764572e9db4ab900a57689a54e8ce is affected.
- Version 21234efe2a8474a6d2d01ea9573319de7858ce44 is affected.
- Version 5.10.235 and below 5.10.259 is affected.
- Version 5.15.179 and below 5.15.210 is affected.
- Version 6.1.130 and below 6.1.176 is affected.
- Version 6.6.80 and below 6.6.143 is affected.
- Version 6.12.17 and below 6.12.94 is affected.
- Version 5.4.291 and below 5.5 is affected.
- Version 6.13.5 and below 6.14 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 5.10.259, <= 5.10.* is unaffected.
- Version 5.15.210, <= 5.15.* is unaffected.
- Version 6.1.176, <= 6.1.* is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.