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

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:51
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 CPE status
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)
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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 , ≤ * (original_commit_for_fix)
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{
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          "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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              "value": "AV:L - The bug is reached only through local `request_key()` and `keyctl()` syscalls (`KEYCTL_ASSUME_AUTHORITY`, `KEYCTL_INSTANTIATE`, `KEYCTL_INSTANTIATE_IOV`, `KEYCTL_REJECT`); there is no network, adjacent-radio, or physical-device entry path.\nAC:L - Exploitation is a race the attacker orchestrates by calling `request_key()` and concurrently driving `KEYCTL_INSTANTIATE_IOV` with a user buffer that page-faults during `copy_from_iter_full()`, while a second helper thread or completion path revokes/frees the auth payload.\nPR:L - Any unprivileged local user can invoke `request_key()` and the affected `keyctl` instantiate/reject operations in the spawned helper context; no real-root or non-userns capability is required.\nUI:N - Exploitation does not depend on a victim performing an action beyond the attacker\u2019s own syscall activity and helper process setup.\nS:U - Impact is kernel memory corruption and local privilege escalation within the same kernel security domain, not a VM-guest-to-host or IOMMU boundary escape.\nC:H - This is a heap use-after-free of `struct request_key_auth`; after free the code dereferences `rka-\u003etarget_key` and related fields, enabling attacker-controlled reuse and arbitrary kernel memory disclosure.\nI:H - The UAF corrupts trusted kernel pointers (`target_key`, `dest_keyring`) used in `key_instantiate_and_link()`, which can be turned into arbitrary kernel writes and local privilege escalation.\nA:H - Use-after-free of kernel heap objects can cause kernel oops/panic during post-fault dereferences, and is independently severe even before full exploitation."
            }
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        }
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        "dateUpdated": "2026-08-17T04:51:31.393Z",
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    "datePublished": "2026-07-19T12:02:19.847Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-08-17T04:51:31.393Z",
    "state": "PUBLISHED"
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      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "keys: Pin request_key_auth payload in instantiate paths",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63823.json",
      "version": "4"
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            "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.]"
          }
        ],
        "id": "CVE-2026-63823",
        "lastModified": "2026-08-17T05:17:19.800",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "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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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-07-19T12:16:55.457",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "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"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:47:58Z",
      "cve": "CVE-2026-63823",
      "id": "CVE-2026-63823",
      "initial_release_date": "2026-07-19T17:34:41Z",
      "product_status:first_fixed": "127",
      "product_status:known_affected": "721",
      "product_status:recommended": "111",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63823",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63823.json",
      "version": "12"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.