FKIE_CVE-2026-99222

Vulnerability from fkie_nvd - Published: 2026-11-02 16:17 - Updated: 2026-11-03 20:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: keys: Protect the read method check against type removal keyctl_read_key() checks key->type->read without holding key->sem. A reference keeps the key alive, but does not pin the module containing its type. A surviving RxRPC key can therefore be read while AF_RXRPC is being unloaded: KEYCTL_READ task Module unload and key GC ---------------- ------------------------ lookup_user_key() permission / possession checks load key->type af_rxrpc_exit() unregister_key_type() GC: down_write(key->sem) GC: retype to key_type_dead GC: up_write(key->sem) unregister_key_type() returns free_module() read saved type's read member The final access can read freed module storage. The read invocation in __keyctl_read_key() is already protected by key->sem, but the earlier method check is outside that critical section. Move the method check into __keyctl_read_key(), after key_validate() and under its existing read hold on key->sem. The check and invocation then use the same protected type for length queries and every read retry. The GC cannot retype the key until the semaphore is released, and type unregistration waits for that GC pass before the module can be freed. Return -EOPNOTSUPP when validation succeeds and the type has no read method. A temporary buffer may now be allocated before this result; allocation and copying to userspace remain outside the semaphore.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1486caee47b4909f52835a957c3293e970113e44
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3edc064069d07e7d37359fcb4d03d3bab15ee3ab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a36e2a1a017c51f8a8ad2a094566bad97c46a9b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/925c84e3cc21caf09de92d9bcafab0147790debf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf1af7df80e38bf58bd74c2cccce32fcbd1a596a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2a2deda08d91644f5e30c17d267b1cdc5f124b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5f830ae6611cddbfc504c43f14155f60b63206a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff11cfed85cbfdd7fe1185ebd18d2c7a8353ad8d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff44f1b303aa76a818d898e85c56ed4852c031e2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/keys/keyctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e5f830ae6611cddbfc504c43f14155f60b63206a",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "ff11cfed85cbfdd7fe1185ebd18d2c7a8353ad8d",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "1486caee47b4909f52835a957c3293e970113e44",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "ff44f1b303aa76a818d898e85c56ed4852c031e2",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "6a36e2a1a017c51f8a8ad2a094566bad97c46a9b",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "3edc064069d07e7d37359fcb4d03d3bab15ee3ab",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "cf1af7df80e38bf58bd74c2cccce32fcbd1a596a",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "e2a2deda08d91644f5e30c17d267b1cdc5f124b2",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "lessThan": "925c84e3cc21caf09de92d9bcafab0147790debf",
              "status": "affected",
              "version": "d3ec10aa95819bff18a0d936b18884c7816d0914",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7fa67aa30509ad0da72ac0f757aa76e53c0ea3de",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "18779eac17b5df9dff57138d07631573553a41d4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f1afcf9488fc45765e20e2047d3b776981900e0b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "212d3adb1af4e34acb158d6c6def370016a1011d",
              "versionType": "git"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.177",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.118",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.35",
              "versionType": "semver"
            },
            {
              "lessThan": "5.7",
              "status": "affected",
              "version": "5.6.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "security/keys/keyctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.3.*",
              "status": "unaffected",
              "version": "7.3.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.4-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Protect the read method check against type removal\n\nkeyctl_read_key() checks key-\u003etype-\u003eread without holding key-\u003esem.\nA reference keeps the key alive, but does not pin the module containing\nits type. A surviving RxRPC key can therefore be read while AF_RXRPC\nis being unloaded:\n\n  KEYCTL_READ task                    Module unload and key GC\n  ----------------                   ------------------------\n  lookup_user_key()\n  permission / possession checks\n  load key-\u003etype\n                                     af_rxrpc_exit()\n                                       unregister_key_type()\n                                         GC: down_write(key-\u003esem)\n                                         GC: retype to key_type_dead\n                                         GC: up_write(key-\u003esem)\n                                       unregister_key_type() returns\n                                     free_module()\n  read saved type\u0027s read member\n\nThe final access can read freed module storage. The read invocation in\n__keyctl_read_key() is already protected by key-\u003esem, but the earlier\nmethod check is outside that critical section.\n\nMove the method check into __keyctl_read_key(), after key_validate() and\nunder its existing read hold on key-\u003esem. The check and invocation then\nuse the same protected type for length queries and every read retry.\nThe GC cannot retype the key until the semaphore is released, and type\nunregistration waits for that GC pass before the module can be freed.\n\nReturn -EOPNOTSUPP when validation succeeds and the type has no read\nmethod. A temporary buffer may now be allocated before this result;\nallocation and copying to userspace remain outside the semaphore."
    }
  ],
  "id": "CVE-2026-99222",
  "lastModified": "2026-11-03T20:18:27.500",
  "metrics": {},
  "published": "2026-11-02T16:17:46.460",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1486caee47b4909f52835a957c3293e970113e44"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3edc064069d07e7d37359fcb4d03d3bab15ee3ab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a36e2a1a017c51f8a8ad2a094566bad97c46a9b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/925c84e3cc21caf09de92d9bcafab0147790debf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf1af7df80e38bf58bd74c2cccce32fcbd1a596a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e2a2deda08d91644f5e30c17d267b1cdc5f124b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5f830ae6611cddbfc504c43f14155f60b63206a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff11cfed85cbfdd7fe1185ebd18d2c7a8353ad8d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff44f1b303aa76a818d898e85c56ed4852c031e2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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