CVE-2026-63823 (GCVE-0-2026-63823)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
keys: Pin request_key_auth payload in instantiate paths
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: Pin request_key_auth payload in instantiate paths A: request_key() B: KEYCTL_INSTANTIATE_IOV ================ ========================= create auth key store rka in auth key wait for helper get auth key load rka from auth key copy user payload sleep on #PF helper completed detach and free rka destroy auth key wake up use rka->target_key **USE-AFTER-FREE** Give request_key_auth payloads a refcount. Take a payload reference while authkey->sem stabilizes the payload and revocation state. Hold that reference across the instantiate and reject paths. Drop the auth key owning reference from revoke and destroy. [jarkko: Replaced the first two paragraphs of text with an actual concurrency scenario.]
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: b5f545c880a2a47947ba2118b2509644ab7a2969 , < d8274181b0f28d450b42489723a5ba81042158d7 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < 4982bfabce6b33b3c9eddb4fb900fe5568b7cf91 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < 708709c65a1832a99b0eef8ae46e343ddaca3d06 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < 35ab4db86774d82389e4b9559e26ab7f68d8e395 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < f9b68632ac93cc742f2e411021c4dbfe452ea0c2 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < 7216ce8cb12fee44e309503955bb83806b106129 (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < 83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f (git)
Affected: b5f545c880a2a47947ba2118b2509644ab7a2969 , < fd15b457a86939c38aa12116adabd8ff686c5e51 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Pin request_key_auth payload in instantiate paths\n\nA: request_key()       B: KEYCTL_INSTANTIATE_IOV\n================       =========================\n\ncreate auth key\nstore rka in auth key\nwait for helper\n                       get auth key\n                       load rka from auth key\n                       copy user payload\n                       sleep on #PF\n\nhelper completed\ndetach and free rka\ndestroy auth key\n                       wake up\n                       use rka-\u003etarget_key\n                       **USE-AFTER-FREE**\n\nGive request_key_auth payloads a refcount.  Take a payload reference while\nauthkey-\u003esem stabilizes the payload and revocation state.  Hold that\nreference across the instantiate and reject paths.  Drop the auth key\nowning reference from revoke and destroy.\n\n[jarkko: Replaced the first two paragraphs of text with an actual\n concurrency scenario.]"
        }
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            "version": "3.1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51"
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      ],
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    "datePublished": "2026-07-19T12:02:19.847Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-07-20T13:40:27.567Z",
    "state": "PUBLISHED"
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    },
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Take a payload reference while\\nauthkey-\u003esem stabilizes the payload and revocation state.  Hold that\\nreference across the instantiate and reject paths.  Drop the auth key\\nowning reference from revoke and destroy.\\n\\n[jarkko: Replaced the first two paragraphs of text with an actual\\n concurrency scenario.]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/keys/request_key_auth-type.h\",\"security/keys/internal.h\",\"security/keys/keyctl.c\",\"security/keys/request_key_auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"d8274181b0f28d450b42489723a5ba81042158d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"4982bfabce6b33b3c9eddb4fb900fe5568b7cf91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"708709c65a1832a99b0eef8ae46e343ddaca3d06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"35ab4db86774d82389e4b9559e26ab7f68d8e395\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"f9b68632ac93cc742f2e411021c4dbfe452ea0c2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"7216ce8cb12fee44e309503955bb83806b106129\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b5f545c880a2a47947ba2118b2509644ab7a2969\",\"lessThan\":\"fd15b457a86939c38aa12116adabd8ff686c5e51\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/keys/request_key_auth-type.h\",\"security/keys/internal.h\",\"security/keys/keyctl.c\",\"security/keys/request_key_auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T17:23:53+00:00",
      "cve": "CVE-2026-63823",
      "id": "CVE-2026-63823",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: keys: Pin request_key_auth payload in instantiate paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63823.json",
      "version": "3"
    }
  }
}



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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

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.