md/raid5-cache: fix a deadlock in r5l_exit_log()

{
  "id": "84f3598c8bb380ab192d438adca20deb85cf892a3e4b2f13db758cebc2031578",
  "url": "https://osv.dev/vulnerability/CVE-2023-53848",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "md/raid5-cache: fix a deadlock in r5l_exit_log()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: md/raid5-cache: fix a deadlock in r5l_exit_log() Commit b13015af94cf (\"md/raid5-cache: Clear conf->log after finishing work\") introduce a new problem: // caller hold reconfig_mutex r5l_exit_log flush_work(&log->disable_writeback_work) r5c_disable_writeback_async wait_event /* * conf->log is not NULL, and mddev_trylock() * will fail, wait_event() can never pass. */ conf->log = NULL Fix this problem by setting 'config->log' to NULL before wake_up() as it used to be, so that wait_event() from r5c_disable_writeback_async() can exist. In the meantime, move forward md_unregister_thread() so that null-ptr-deref this commit fixed can still be fixed.",
    "evidence": "osv:CVE-2023-53848",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.53",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.4.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.5.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53848",
      "aliases": [
        "CVE-2023-53848"
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      ],
      "modified": "2026-10-28T02:30:50.248526307Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/71cf23271f015a57038bdc4669952096f9fe5500",
        "https://git.kernel.org/stable/c/a705b11b358dee677aad80630e7608b2d5f56691",
        "https://git.kernel.org/stable/c/ac9e103f282a7854f3274ef5ff0742fbbe8d7d6b",
        "https://git.kernel.org/stable/c/c406984738215dc20ac2dc63e49d70f20797730e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53848.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53848",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518957,
  "published_at": "2025-12-09T01:30:11.895+00:00"
}