CVE-2023-53810 (GCVE-0-2023-53810)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:01 – Updated: 2025-12-09 00:01
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-mq: release crypto keyslot before reporting I/O complete Once all I/O using a blk_crypto_key has completed, filesystems can call blk_crypto_evict_key(). However, the block layer currently doesn't call blk_crypto_put_keyslot() until the request is being freed, which happens after upper layers have been told (via bio_endio()) the I/O has completed. This causes a race condition where blk_crypto_evict_key() can see 'slot_refs != 0' without there being an actual bug. This makes __blk_crypto_evict_key() hit the 'WARN_ON_ONCE(atomic_read(&slot->slot_refs) != 0)' and return without doing anything, eventually causing a use-after-free in blk_crypto_reprogram_all_keys(). (This is a very rare bug and has only been seen when per-file keys are being used with fscrypt.) There are two options to fix this: either release the keyslot before bio_endio() is called on the request's last bio, or make __blk_crypto_evict_key() ignore slot_refs. Let's go with the first solution, since it preserves the ability to report bugs (via WARN_ON_ONCE) where a key is evicted while still in-use.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < 874bdf43b4a7dc5463c31508f62b3e42eb237b08 (git)
Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < d206f79d9cd658665b37ce8134c6ec849ac7af0c (git)
Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < 7d206ec7a04e8545828191b6ea8b49d3ea61391f (git)
Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < b278570e2c59d538216f8b656e97680188a8fba4 (git)
Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < 92d5d233b9ff531cf9cc36ab4251779e07adb633 (git)
Affected: a892c8d52c02284076fbbacae6692aa5c5807d11 , < 9cd1e566676bbcb8a126acd921e4e194e6339603 (git)
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    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-crypto-internal.h",
            "block/blk-crypto.c",
            "block/blk-merge.c",
            "block/blk-mq.c"
          ],
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          "product": "Linux",
          "programFiles": [
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            "block/blk-crypto.c",
            "block/blk-merge.c",
            "block/blk-mq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
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              "version": "5.10.180",
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              "version": "5.15.111",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.28",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.2.*",
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              "version": "6.2.15",
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              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: release crypto keyslot before reporting I/O complete\n\nOnce all I/O using a blk_crypto_key has completed, filesystems can call\nblk_crypto_evict_key().  However, the block layer currently doesn\u0027t call\nblk_crypto_put_keyslot() until the request is being freed, which happens\nafter upper layers have been told (via bio_endio()) the I/O has\ncompleted.  This causes a race condition where blk_crypto_evict_key()\ncan see \u0027slot_refs != 0\u0027 without there being an actual bug.\n\nThis makes __blk_crypto_evict_key() hit the\n\u0027WARN_ON_ONCE(atomic_read(\u0026slot-\u003eslot_refs) != 0)\u0027 and return without\ndoing anything, eventually causing a use-after-free in\nblk_crypto_reprogram_all_keys().  (This is a very rare bug and has only\nbeen seen when per-file keys are being used with fscrypt.)\n\nThere are two options to fix this: either release the keyslot before\nbio_endio() is called on the request\u0027s last bio, or make\n__blk_crypto_evict_key() ignore slot_refs.  Let\u0027s go with the first\nsolution, since it preserves the ability to report bugs (via\nWARN_ON_ONCE) where a key is evicted while still in-use."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:01:08.062Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/874bdf43b4a7dc5463c31508f62b3e42eb237b08"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9cd1e566676bbcb8a126acd921e4e194e6339603"
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      "title": "blk-mq: release crypto keyslot before reporting I/O complete",
      "x_generator": {
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    "datePublished": "2025-12-09T00:01:08.062Z",
    "dateReserved": "2025-12-08T23:58:35.276Z",
    "dateUpdated": "2025-12-09T00:01:08.062Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53810\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:53.073\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblk-mq: release crypto keyslot before reporting I/O complete\\n\\nOnce all I/O using a blk_crypto_key has completed, filesystems can call\\nblk_crypto_evict_key().  However, the block layer currently doesn\u0027t call\\nblk_crypto_put_keyslot() until the request is being freed, which happens\\nafter upper layers have been told (via bio_endio()) the I/O has\\ncompleted.  This causes a race condition where blk_crypto_evict_key()\\ncan see \u0027slot_refs != 0\u0027 without there being an actual bug.\\n\\nThis makes __blk_crypto_evict_key() hit the\\n\u0027WARN_ON_ONCE(atomic_read(\u0026slot-\u003eslot_refs) != 0)\u0027 and return without\\ndoing anything, eventually causing a use-after-free in\\nblk_crypto_reprogram_all_keys().  (This is a very rare bug and has only\\nbeen seen when per-file keys are being used with fscrypt.)\\n\\nThere are two options to fix this: either release the keyslot before\\nbio_endio() is called on the request\u0027s last bio, or make\\n__blk_crypto_evict_key() ignore slot_refs.  Let\u0027s go with the first\\nsolution, since it preserves the ability to report bugs (via\\nWARN_ON_ONCE) where a key is evicted while still in-use.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7d206ec7a04e8545828191b6ea8b49d3ea61391f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/874bdf43b4a7dc5463c31508f62b3e42eb237b08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92d5d233b9ff531cf9cc36ab4251779e07adb633\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9cd1e566676bbcb8a126acd921e4e194e6339603\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b278570e2c59d538216f8b656e97680188a8fba4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d206f79d9cd658665b37ce8134c6ec849ac7af0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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