CVE-2025-21871 (GCVE-0-2025-21871)

Vulnerability from cvelistv5 – Published: 2025-03-27 13:38 – Updated: 2026-05-11 21:08
VLAI
Title
tee: optee: Fix supplicant wait loop
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < 3eb4911364c764572e9db4ab900a57689a54e8ce (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < 0180cf0373f84fff61b16f8c062553a13dd7cfca (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < c0a9a948159153be145f9471435695373904ee6d (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < ec18520f5edc20a00c34a8c9fdd6507c355e880f (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < d61cc1a435e6894bfb0dd3370c6f765d2d12825d (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < fd9d2d6124c293e40797a080adf8a9c237efd8b8 (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < 21234efe2a8474a6d2d01ea9573319de7858ce44 (git)
Affected: 4fb0a5eb364d239722e745c02aef0dbd4e0f1ad2 , < 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 (git)
Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.130 , ≤ 6.1.* (semver)
Unaffected: 6.6.80 , ≤ 6.6.* (semver)
Unaffected: 6.12.17 , ≤ 6.12.* (semver)
Unaffected: 6.13.5 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:04:27+00:00",
      "cve": "CVE-2025-21871",
      "id": "CVE-2025-21871",
      "initial_release_date": "2025-03-27T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tee: optee: Fix supplicant wait loop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21871.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-17T13:15:39Z",
      "cve": "CVE-2025-21871",
      "id": "CVE-2025-21871",
      "initial_release_date": "2025-03-28T03:01:02Z",
      "product_status:known_affected": "624",
      "product_status:known_not_affected": "22",
      "product_status:recommended": "421",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21871",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21871.json",
      "version": "41"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.