CVE-2025-21871tee: optee: Fix supplicant wait loop
- 5.5MediumCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix supplicant wait loop OP-TEE supplicant is a user-space daemon and it's possible for it be hung or crashed or killed in the middle of processing an OP-TEE RPC call. It becomes more complicated when there is incorrect shutdown ordering of the supplicant process vs the OP-TEE client application which can eventually lead to system hang-up waiting for the closure of the client application. Allow the client process waiting in kernel for supplicant response to be killed rather than indefinitely waiting in an unkillable state. Also, a normal uninterruptible wait should not have resulted in the hung-task watchdog getting triggered, but the endless loop would. This fixes issues observed during system reboot/shutdown when supplicant got hung for some reason or gets crashed/killed which lead to client getting hung in an unkillable state. It in turn lead to system being in hung up state requiring hard power off/on to recover.
Timeline
ID reserved
By Linux
- 3 months later
· 3 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < 3eb4911364c764572e9db4ab900a57689a54e8ce
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < 0180cf0373f84fff61b16f8c062553a13dd7cfca
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < c0a9a948159153be145f9471435695373904ee6d
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < ec18520f5edc20a00c34a8c9fdd6507c355e880f
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < d61cc1a435e6894bfb0dd3370c6f765d2d12825d
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < fd9d2d6124c293e40797a080adf8a9c237efd8b8
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < 21234efe2a8474a6d2d01ea9573319de7858ce44
- affected 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 – < 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612
- affected 4.12
- unaffected < 4.12
- unaffected 5.4.291 – ≤ 5.4.*
- unaffected 5.10.235 – ≤ 5.10.*
- unaffected 5.15.179 – ≤ 5.15.*
- unaffected 6.1.130 – ≤ 6.1.*
- unaffected 6.6.80 – ≤ 6.6.*
- unaffected 6.12.17 – ≤ 6.12.*
- unaffected 6.13.5 – ≤ 6.13.*
- unaffected 6.14 – ≤ *
References
References10
- https://git.kernel.org/stable/c/3eb4911364c764572e9db4ab900a57689a54e8ce (opens in a new tab)
- https://git.kernel.org/stable/c/0180cf0373f84fff61b16f8c062553a13dd7cfca (opens in a new tab)
- https://git.kernel.org/stable/c/c0a9a948159153be145f9471435695373904ee6d (opens in a new tab)
- https://git.kernel.org/stable/c/ec18520f5edc20a00c34a8c9fdd6507c355e880f (opens in a new tab)
- https://git.kernel.org/stable/c/d61cc1a435e6894bfb0dd3370c6f765d2d12825d (opens in a new tab)
- https://git.kernel.org/stable/c/fd9d2d6124c293e40797a080adf8a9c237efd8b8 (opens in a new tab)
- https://git.kernel.org/stable/c/21234efe2a8474a6d2d01ea9573319de7858ce44 (opens in a new tab)
- https://git.kernel.org/stable/c/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-8431 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21871)Record last updated .