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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
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)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: optee: prevent use-after-free when the client exits before the supplicant\n\nCommit 70b0d6b0a199 (\"tee: optee: Fix supplicant wait loop\") made the\nclient wait as killable so it can be interrupted during shutdown or\nafter a supplicant crash. This changes the original lifetime expectations:\nthe client task can now terminate while the supplicant is still processing\nits request.\n\nIf the client exits first it removes the request from its queue and\nkfree()s it, while the request ID remains in supp-\u003eidr. 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 race."
        }
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        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The vulnerable path is reached through local TEE character device ioctls where a client request enters OP-TEE and is later completed by tee-supplicant via TEE_IOC_SUPPL_SEND. It is not directly reachable from network packets.\nAC:L - The attacker can create supplicant-backed OP-TEE requests and interrupt or terminate the waiting client while the supplicant is processing them. This race is attacker-triggerable and repeatable rather than dependent on rare external conditions.\nPR:L - A basic local user can reach the non-privileged TEE client ioctl path and rely on the legitimate system tee-supplicant to complete the request. The privileged supplicant device exists, but attacker control of it is not required to trigger the UAF.\nUI:N - No victim user action is needed after the attacker runs the local client and triggers the ioctl/race sequence. The supplicant daemon processes queued requests automatically.\nS:U - The memory corruption occurs in the normal-world kernel OP-TEE driver and affects the same kernel security authority. This is a standard local kernel compromise path, not a VM escape or separate security-scope bypass.\nC:H - The stale IDR entry points to a freed optee_supp_req that is later dereferenced by optee_supp_send. As a use-after-free in kernel heap memory, it can plausibly be shaped into disclosure of arbitrary kernel memory.\nI:H - The supplicant completion path writes through fields of the freed request, including the request parameter pointer and completion state. This kernel UAF can plausibly be exploited for controlled memory corruption and privilege escalation.\nA:H - Even without full exploitation, dereferencing and updating a freed kernel object can readily cause an oops, panic, or hang. The bug is repeatedly triggerable from a local client while supplicant requests are in flight."
            }
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        "dateUpdated": "2026-08-05T12:34:49.968Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34"
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          "url": "https://git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1"
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        {
          "url": "https://git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e"
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      ],
      "title": "tee: optee: prevent use-after-free when the client exits before the supplicant",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53273",
    "datePublished": "2026-06-25T08:39:57.811Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-08-05T12:34:49.968Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53273",
      "date": "2026-08-08",
      "epss": "0.00117",
      "percentile": "0.01948"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53273\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:45.447\",\"lastModified\":\"2026-07-08T04:00:54.680\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntee: optee: prevent use-after-free when the client exits before the supplicant\\n\\nCommit 70b0d6b0a199 (\\\"tee: optee: Fix supplicant wait loop\\\") made the\\nclient wait as killable so it can be interrupted during shutdown or\\nafter a supplicant crash. This changes the original lifetime expectations:\\nthe client task can now terminate while the supplicant is still processing\\nits request.\\n\\nIf the client exits first it removes the request from its queue and\\nkfree()s it, while the request ID remains in supp-\u003eidr. 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 race.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tee/optee/supp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tee/optee/supp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.291\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"2082E874-B9D3-4B60-9D27-1F3B8A838CD0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.235\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"3CB82F7B-CABF-48EC-AEED-4A5799F64E5F\"},{\"vulner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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": "2026-08-06T01:13:34Z",
      "cve": "CVE-2026-53273",
      "id": "CVE-2026-53273",
      "initial_release_date": "2026-06-26T02:07:52Z",
      "product_status:known_affected": "144",
      "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": "7"
    }
  }
}



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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.