CVE-2026-53273 (GCVE-0-2026-53273)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41
VLAI
Title
tee: optee: prevent use-after-free when the client exits before the supplicant
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0180cf0373f84fff61b16f8c062553a13dd7cfca , < 416259cb5bffecaaae5f76539deb535a8c1b2c34 (git)
Affected: c0a9a948159153be145f9471435695373904ee6d , < 724d0caffd4204b46f78efe22f18f8338031c6e1 (git)
Affected: ec18520f5edc20a00c34a8c9fdd6507c355e880f , < ae847ab29ded2d7cece4d5970f0edefa4137bf2f (git)
Affected: d61cc1a435e6894bfb0dd3370c6f765d2d12825d , < 9a0dc9279d0907b198f205a693aedf696b08145d (git)
Affected: fd9d2d6124c293e40797a080adf8a9c237efd8b8 , < d366a01475f927402c96a3fe78bfc06b924fc87d (git)
Affected: 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 , < d5b57bb314d79e99bebb58a53588fa11dd4dbf69 (git)
Affected: 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 , < 373152c94e57e9592b68c100e224fbd943cfd608 (git)
Affected: 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612 , < 387a926ee166814611acecb960207fe2f3c4fd3e (git)
Affected: 3eb4911364c764572e9db4ab900a57689a54e8ce (git)
Affected: 21234efe2a8474a6d2d01ea9573319de7858ce44 (git)
Affected: 5.10.235 , < 5.10.259 (semver)
Affected: 5.15.179 , < 5.15.210 (semver)
Affected: 6.1.130 , < 6.1.176 (semver)
Affected: 6.6.80 , < 6.6.143 (semver)
Affected: 6.12.17 , < 6.12.94 (semver)
Affected: 5.4.291 , < 5.5 (semver)
Affected: 6.13.5 , < 6.14 (semver)
Create a notification for this product.
Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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A subsequent\\nlookup on the supplicant path then dereferences freed memory, leading to\\na use-after-free.\\n\\nSerialise access to the request with supp-\u003emutex:\\n\\n  * Hold supp-\u003emutex in optee_supp_recv() and optee_supp_send() while\\n    looking up and touching the request.\\n  * Let optee_supp_thrd_req() notice that the client has terminated and\\n    signal optee_supp_send() accordingly.\\n\\nWith these changes the request cannot be freed while the supplicant still\\nhas a reference, eliminating the 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-26T07:27:53+00:00",
      "cve": "CVE-2026-53273",
      "id": "CVE-2026-53273",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tee: optee: prevent use-after-free when the client exits before the supplicant",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53273.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-01T03:16:41Z",
      "cve": "CVE-2026-53273",
      "id": "CVE-2026-53273",
      "initial_release_date": "2026-06-26T02:07:52Z",
      "product_status:known_affected": "140",
      "product_status:known_not_affected": "151",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53273",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53273.json",
      "version": "5"
    }
  }
}



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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.