{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5ab829f1971dc99f2aac10846c378e67fc875abc"
            },
            {
              "fixed": "c55aa6c17f019b6296952d336939891efa084c06"
            },
            {
              "fixed": "bb7f92d58fca9a9f06f3f51a82481c5f0bbbd46c"
            },
            {
              "fixed": "5553d64e01d9a995be6c3de38501c6dd4ceede3b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90276.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/md-llbitmap: stop daemon timer rearm on destroy\n\nllbitmap_destroy() deletes pending_timer before flushing\nmd_llbitmap_io_wq. However, daemon_work can still be queued or running\nafter the timer has been deleted, and the daemon path can arm\npending_timer again when it finds dirty chunks that are not ready to\nflush yet.\n\nIf that happens during teardown, pending_timer can remain armed after\nllbitmap is freed and later dereference freed memory.\n\nAdd a BITMAP_SHUTDOWN bit to llbitmap-\u003eflags, set it before deleting\nthe timer, and make the timer and daemon paths stop queueing or rearming\nwork once teardown starts. Cancel daemon_work before flushing the shared\nworkqueue so no already queued daemon instance can race with the free.\nUse timer_shutdown_sync() so a daemon instance that passed the shutdown\ncheck before teardown cannot rearm the timer afterward.\n\nBITMAP_SHUTDOWN is a runtime-only state. Mask it out when reading and\nupdating the llbitmap superblock so the shutdown state is never loaded\nfrom disk or persisted to disk.",
  "id": "CVE-2026-90276",
  "modified": "2026-09-19T03:30:35.021399364Z",
  "published": "2026-09-17T16:08:08.697Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5553d64e01d9a995be6c3de38501c6dd4ceede3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb7f92d58fca9a9f06f3f51a82481c5f0bbbd46c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c55aa6c17f019b6296952d336939891efa084c06"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90276.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90276"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "md/md-llbitmap: stop daemon timer rearm on destroy"
}