HighFix available

blk-crypto: make blk_crypto_evict_key() more robust

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blk_crypto_evict_key() more robust If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2
CVEs: CVE-2023-53536
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 21:48 UTC · Revision 1

Source evidence

blk-crypto: make blk_crypto_evict_key() more robust

core-osv · Original source

Published 4 Oct 2025, 15:16 UTC

osv:CVE-2023-53536

Kernel

Fixed versions: 5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2

Complete source record

{
  "id": "383ad7c6b4a428ba3e160ef77c926b5afc6d83d8670c26153fa8973d9ea821d8",
  "url": "https://osv.dev/vulnerability/CVE-2023-53536",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "blk-crypto: make blk_crypto_evict_key() more robust",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blk_crypto_evict_key() more robust If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments.",
    "evidence": "osv:CVE-2023-53536",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.180",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.28",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.15",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.3.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53536",
      "aliases": [
        "CVE-2023-53536"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1b2628397058ebce7277480960b29c788138de90"
                },
                {
                  "fixed": "701a8220762ff90615dc91d3543f789391b63298"
                },
                {
                  "fixed": "5bb4005fb667c6e2188fa87950f8d5faf2994410"
                },
                {
                  "fixed": "64ef787bb1588475163069c2e62fdd8f6c27b1f6"
                },
                {
                  "fixed": "809a5be62e92a444a3c3d7b9f438019d0b322f55"
                },
                {
                  "fixed": "5c62852942667c613de0458fc797c5b8c36112b5"
                },
                {
                  "fixed": "5c7cb94452901a93e90c2230632e2c12a681bc92"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53536.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.8.0"
                },
                {
                  "fixed": "5.10.180"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.28"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.15"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.3.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53536.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.178764258Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410",
        "https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5",
        "https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92",
        "https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6",
        "https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298",
        "https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53536.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53536",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53536.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53536",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490357,
  "published_at": "2025-10-04T15:16:47.304+00:00"
}