tee: optee: prevent use-after-free when the client exits before the supplicant
Summary
| CVE | CVE-2026-53273 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-25 09:16:45 UTC |
| Updated | 2026-06-25 09:16:45 UTC |
| 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. |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.068470000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 0180cf0373f84fff61b16f8c062553a13dd7cfca 416259cb5bffecaaae5f76539deb535a8c1b2c34 git | Not specified |
| CNA | Linux | Linux | affected c0a9a948159153be145f9471435695373904ee6d 724d0caffd4204b46f78efe22f18f8338031c6e1 git | Not specified |
| CNA | Linux | Linux | affected ec18520f5edc20a00c34a8c9fdd6507c355e880f ae847ab29ded2d7cece4d5970f0edefa4137bf2f git | Not specified |
| CNA | Linux | Linux | affected d61cc1a435e6894bfb0dd3370c6f765d2d12825d 9a0dc9279d0907b198f205a693aedf696b08145d git | Not specified |
| CNA | Linux | Linux | affected fd9d2d6124c293e40797a080adf8a9c237efd8b8 d366a01475f927402c96a3fe78bfc06b924fc87d git | Not specified |
| CNA | Linux | Linux | affected 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 d5b57bb314d79e99bebb58a53588fa11dd4dbf69 git | Not specified |
| CNA | Linux | Linux | affected 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 373152c94e57e9592b68c100e224fbd943cfd608 git | Not specified |
| CNA | Linux | Linux | affected 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 387a926ee166814611acecb960207fe2f3c4fd3e git | Not specified |
| CNA | Linux | Linux | affected 3eb4911364c764572e9db4ab900a57689a54e8ce git | Not specified |
| CNA | Linux | Linux | affected 21234efe2a8474a6d2d01ea9573319de7858ce44 git | Not specified |
| CNA | Linux | Linux | affected 5.10.235 5.10.259 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.179 5.15.210 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.130 6.1.176 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.80 6.6.143 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.17 6.12.94 semver | Not specified |
| CNA | Linux | Linux | affected 5.4.291 5.5 semver | Not specified |
| CNA | Linux | Linux | affected 6.13.5 6.14 semver | Not specified |
| CNA | Linux | Linux | affected 6.14 | Not specified |
| CNA | Linux | Linux | unaffected 6.14 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.259 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.210 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.94 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.36 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.13 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/373152c94e57e9592b68c100e224fbd943cfd608 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d366a01475f927402c96a3fe78bfc06b924fc87d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9a0dc9279d0907b198f205a693aedf696b08145d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d5b57bb314d79e99bebb58a53588fa11dd4dbf69 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ae847ab29ded2d7cece4d5970f0edefa4137bf2f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.