High 7.8Published Jun 25, 2026

CVE-2026-53273tee: optee: prevent use-after-free when the client exits before the supplicant

Updated under an hour ago (Oct 28, 2026, 5:50 AM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 0180cf0373f84fff61b16f8c062553a13dd7cfca before 416259cb5bffecaaae5f76539deb535a8c1b2c34; from c0a9a948159153be145f9471435695373904ee6d before 724d0caffd4204b46f78efe22f18f8338031c6e1; from ec18520f5edc20a00c34a8c9fdd6507c355e880f before ae847ab29ded2d7cece4d5970f0edefa4137bf2f; from d61cc1a435e6894bfb0dd3370c6f765d2d12825d before 9a0dc9279d0907b198f205a693aedf696b08145d; from fd9d2d6124c293e40797a080adf8a9c237efd8b8 before d366a01475f927402c96a3fe78bfc06b924fc87d; from 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 before d5b57bb314d79e99bebb58a53588fa11dd4dbf69; from 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 before 373152c94e57e9592b68c100e224fbd943cfd608; from 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 before 387a926ee166814611acecb960207fe2f3c4fd3e; and 9 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 5.4.291 before 5.5; from 5.10.235 before 5.10.259; from 5.15.179 before 5.15.210; from 6.1.130 before 6.1.176; from 6.6.80 before 6.6.143; from 6.12.17 before 6.12.94; from 6.13.5 before 6.14; from 6.14.1 before 6.18.36; and 12 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.