{"cve":"CVE-2025-21871","nvd":{"published":"2025-03-27T14:15:48.860","modified":"2026-06-17T08:44:30.010","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntee: optee: Fix supplicant wait loop\n\nOP-TEE supplicant is a user-space daemon and it's possible for it\nbe hung or crashed or killed in the middle of processing an OP-TEE\nRPC call. It becomes more complicated when there is incorrect shutdown\nordering of the supplicant process vs the OP-TEE client application which\ncan eventually lead to system hang-up waiting for the closure of the\nclient application.\n\nAllow the client process waiting in kernel for supplicant response to\nbe killed rather than indefinitely waiting in an unkillable state. Also,\na normal uninterruptible wait should not have resulted in the hung-task\nwatchdog getting triggered, but the endless loop would.\n\nThis fixes issues observed during system reboot/shutdown when supplicant\ngot hung for some reason or gets crashed/killed which lead to client\ngetting hung in an unkillable state. It in turn lead to system being in\nhung up state requiring hard power off/on to recover.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-835"],"references":["https://git.kernel.org/stable/c/0180cf0373f84fff61b16f8c062553a13dd7cfca","https://git.kernel.org/stable/c/21234efe2a8474a6d2d01ea9573319de7858ce44","https://git.kernel.org/stable/c/3eb4911364c764572e9db4ab900a57689a54e8ce","https://git.kernel.org/stable/c/70b0d6b0a199c5a3ee6c72f5e61681ed6f759612","https://git.kernel.org/stable/c/c0a9a948159153be145f9471435695373904ee6d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:00:28.034033815+00:00"},"epss":{"cve":"CVE-2025-21871","score":0.00217,"percentile":0.12209,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}