block: stop the timeout timer when releasing a never added disk

{
  "id": "796a7a74236b8708034e478be6fbb038dfca4fd04e9c0303fdcba9e120ca104c",
  "url": "https://osv.dev/vulnerability/CVE-2026-80589",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "block: stop the timeout timer when releasing a never added disk",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: block: stop the timeout timer when releasing a never added disk disk_release() undoes blk_mq_init_allocated_queue() for a disk whose probe failed before add_disk(), but it only calls blk_mq_exit_queue(). Nothing there stops q->timeout, and that timer rolls forward: it stays pending until it next expires, not until the last request completes. So if the driver issued any I/O before adding the disk, the request_queue is freed while still linked into a timer wheel bucket. Commit 6f8191fdf41d (\"block: simplify disk shutdown\") dropped the blk_cleanup_queue() call that used to stop it. __del_gendisk() and blk_mq_destroy_queue() still do; only the probe failure path lost it. nvme gets there because nvme_update_ns_info() submits Report Zones or FDP io-mgmt-recv on ns->queue before the disk is added, so a later failure - a concurrent reset setting NVME_CTRL_FROZEN, or device_add_disk() failing - lands in put_disk() with the timer armed: BUG: KASAN: slab-use-after-free in detach_if_pending+0x30c/0x340 Write of size 8 at addr ffff888004d71310 by task kworker/u8:2/37 __timer_delete_sync+0x156/0x240 kernel/time/timer.c:1621 blk_sync_queue+0x22/0x40 block/blk-core.c:222 nvme_sync_queues+0x100/0x150 drivers/nvme/host/core.c:5362 nvme_reset_work+0x138/0x930 drivers/nvme/host/pci.c:3264 Allocated by task 34: __blk_mq_alloc_disk+0x33/0x100 block/blk-mq.c:4462 nvme_alloc_ns+0x290/0x3870 drivers/nvme/host/core.c:4146 Freed by tas",
    "evidence": "osv:CVE-2026-80589",
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          "type": "CVSS_V3",
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      "modified": "2026-10-28T02:30:28.334302285Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1a0ae4d502062a2759f2a92d12bdeab3c64c7372",
        "https://git.kernel.org/stable/c/26cb8ebbfaf713c82e142d08828d4d765057633b",
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        "https://git.kernel.org/stable/c/bb03b56d1d754908a37a160603be21769da423cf",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80589.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80589",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "cna_assigner": "Linux",
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 495019,
  "published_at": "2026-08-26T14:37:43.293+00:00"
}