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.
CVE-2026-53273
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53273
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0180cf0373f84fff61b16f8c062553a13dd7cfca",
"lessThan": "416259cb5bffecaaae5f76539deb535a8c1b2c34",
"versionType": "git"
},
{
"status": "affected",
"version": "c0a9a948159153be145f9471435695373904ee6d",
"lessThan": "724d0caffd4204b46f78efe22f18f8338031c6e1",
"versionType": "git"
},
{
"status": "affected",
"version": "ec18520f5edc20a00c34a8c9fdd6507c355e880f",
"lessThan": "ae847ab29ded2d7cece4d5970f0edefa4137bf2f",
"versionType": "git"
},
{
"status": "affected",
"version": "d61cc1a435e6894bfb0dd3370c6f765d2d12825d",
"lessThan": "9a0dc9279d0907b198f205a693aedf696b08145d",
"versionType": "git"
},
{
"status": "affected",
"version": "fd9d2d6124c293e40797a080adf8a9c237efd8b8",
"lessThan": "d366a01475f927402c96a3fe78bfc06b924fc87d",
"versionType": "git"
},
{
"status": "affected",
"version": "70b0d6b0a199c5a3ee6c72f5e61681ed6f759612",
"lessThan": "d5b57bb314d79e99bebb58a53588fa11dd4dbf69",
"versionType": "git"
},
{
"status": "affected",
"version": "70b0d6b0a199c5a3ee6c72f5e61681ed6f759612",
"lessThan": "373152c94e57e9592b68c100e224fbd943cfd608",
"versionType": "git"
},
{
"status": "affected",
"version": "70b0d6b0a199c5a3ee6c72f5e61681ed6f759612",
"lessThan": "387a926ee166814611acecb960207fe2f3c4fd3e",
"versionType": "git"
},
{
"status": "affected",
"version": "3eb4911364c764572e9db4ab900a57689a54e8ce",
"versionType": "git"
},
{
"status": "affected",
"version": "21234efe2a8474a6d2d01ea9573319de7858ce44",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.235",
"lessThan": "5.10.259",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.179",
"lessThan": "5.15.210",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.130",
"lessThan": "6.1.176",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.80",
"lessThan": "6.6.143",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.17",
"lessThan": "6.12.94",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.291",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.13.5",
"lessThan": "6.14",
"versionType": "semver"
}
],
"programFiles": [
"drivers/tee/optee/supp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/tee/optee/supp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53273
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40802 · Revision 1
- Added to Heist Feed
- Publisher date