CVE-2026-80589 (GCVE-0-2026-80589)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:02
VLAI
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 task 0: blk_free_queue_rcu+0x3a/0x50 block/blk-core.c:254 rcu_core+0xc10/0x1730 kernel/rcu/tree.c:2857 The queue being synced there is ctrl->admin_q, only a victim sharing a timer wheel bucket with the freed queue's dangling entry; other runs tripped in enqueue_timer(), __run_timers() or blk_mq_timeout_work(). Failing nvme_alloc_ns() with a debug patch makes it deterministic: one leaked timer trips KASAN within seconds, while 1987 patched releases produced no splat. Stop the timer and the queue work items before blk_mq_exit_queue(), like blk_mq_destroy_queue() does. Found by FuzzNvme.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0 (git)
Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < 6f06dbe5012c160e0dba418a5a9cb16c456ad46a (git)
Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < 1a0ae4d502062a2759f2a92d12bdeab3c64c7372 (git)
Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < bb03b56d1d754908a37a160603be21769da423cf (git)
Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < 93d620519d71dfc6ee64b5baea74f1d85d4439fb (git)
Affected: 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 , < 26cb8ebbfaf713c82e142d08828d4d765057633b (git)
Affected: d27b66257db183fe11c10f31246ae965adb005d3 (git)
Affected: 5.19.12 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: stop the timeout timer when releasing a never added disk\n\ndisk_release() undoes blk_mq_init_allocated_queue() for a disk whose\nprobe failed before add_disk(), but it only calls blk_mq_exit_queue().\nNothing there stops q-\u003etimeout, and that timer rolls forward: it stays\npending until it next expires, not until the last request completes.\nSo if the driver issued any I/O before adding the disk, the\nrequest_queue is freed while still linked into a timer wheel bucket.\n\nCommit 6f8191fdf41d (\"block: simplify disk shutdown\") dropped the\nblk_cleanup_queue() call that used to stop it.  __del_gendisk() and\nblk_mq_destroy_queue() still do; only the probe failure path lost it.\n\nnvme gets there because nvme_update_ns_info() submits Report Zones or\nFDP io-mgmt-recv on ns-\u003equeue before the disk is added, so a later\nfailure - a concurrent reset setting NVME_CTRL_FROZEN, or\ndevice_add_disk() failing - lands in put_disk() with the timer armed:\n\n  BUG: KASAN: slab-use-after-free in detach_if_pending+0x30c/0x340\n  Write of size 8 at addr ffff888004d71310 by task kworker/u8:2/37\n   __timer_delete_sync+0x156/0x240 kernel/time/timer.c:1621\n   blk_sync_queue+0x22/0x40 block/blk-core.c:222\n   nvme_sync_queues+0x100/0x150 drivers/nvme/host/core.c:5362\n   nvme_reset_work+0x138/0x930 drivers/nvme/host/pci.c:3264\n\n  Allocated by task 34:\n   __blk_mq_alloc_disk+0x33/0x100 block/blk-mq.c:4462\n   nvme_alloc_ns+0x290/0x3870 drivers/nvme/host/core.c:4146\n\n  Freed by task 0:\n   blk_free_queue_rcu+0x3a/0x50 block/blk-core.c:254\n   rcu_core+0xc10/0x1730 kernel/rcu/tree.c:2857\n\nThe queue being synced there is ctrl-\u003eadmin_q, only a victim sharing a\ntimer wheel bucket with the freed queue\u0027s dangling entry; other runs\ntripped in enqueue_timer(), __run_timers() or blk_mq_timeout_work().\nFailing nvme_alloc_ns() with a debug patch makes it deterministic: one\nleaked timer trips KASAN within seconds, while 1987 patched releases\nproduced no splat.\n\nStop the timer and the queue work items before blk_mq_exit_queue(), like\nblk_mq_destroy_queue() does.\n\nFound by FuzzNvme."
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              "value": "AV:N - Exploitation reaches disk_release() via NVMe namespace probing that issues pre-add_disk I/O (FDP io-mgmt-recv, Report Zones) over NVMe-oF TCP/RDMA; a remote or storage-network peer can supply crafted responses during automatic scan/reconnect on cloud/datacenter initiators.\nAC:L - An attacker controlling the NVMe endpoint can reliably time namespace enumeration I/O (arming q-\u003etimeout) with a concurrent probe failure (controller reset/NVME_CTRL_FROZEN or device_add_disk failure); FuzzNvme made this deterministic, and the attacker controls both sides of the race.\nPR:N - No local account or capability is required on the victim host at exploitation time; once an NVMe fabric path exists, a remote/compromised target or storage-network attacker can trigger the probe-failure teardown without CAP_SYS_ADMIN, ioctl, or sysfs access.\nUI:N - The bug fires during automatic kernel namespace scan/reconnect and queue teardown on probe failure; no victim mount, login, or manual device interaction is required beyond normal background storage enumeration.\nS:U - Impact is kernel slab corruption and crashes within the host kernel block layer; it does not cross a VM, container, or IOMMU security boundary even though virtio_blk shares the same pre-add_disk probe pattern.\nC:H - KASAN reports slab use-after-free with an 8-byte write in detach_if_pending on a freed request_queue whose timeout timer remains on the timer wheel; UAF of queue/timer structures enables arbitrary kernel memory disclosure primitives.\nI:H - The dangling timer wheel entry corrupts kernel heap metadata and can affect unrelated queues (e.g., ctrl-\u003eadmin_q in the reported stack); UAF on request_queue/timer state is exploitable for arbitrary write and control-flow hijacking, not merely a crash.\nA:H - Observed impact includes KASAN BUG/oops from timer deletion and queue sync on freed memory; leaked timers also trip in enqueue_timer(), __run_timers(), and blk_mq_timeout_work(), causing kernel panics and denial of service."
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        {
          "url": "https://git.kernel.org/stable/c/26cb8ebbfaf713c82e142d08828d4d765057633b"
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      "title": "block: stop the timeout timer when releasing a never added disk",
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    "dateUpdated": "2026-08-27T05:02:10.391Z",
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only the probe failure path lost it.\\n\\nnvme gets there because nvme_update_ns_info() submits Report Zones or\\nFDP io-mgmt-recv on ns-\u003equeue before the disk is added, so a later\\nfailure - a concurrent reset setting NVME_CTRL_FROZEN, or\\ndevice_add_disk() failing - lands in put_disk() with the timer armed:\\n\\n  BUG: KASAN: slab-use-after-free in detach_if_pending+0x30c/0x340\\n  Write of size 8 at addr ffff888004d71310 by task kworker/u8:2/37\\n   __timer_delete_sync+0x156/0x240 kernel/time/timer.c:1621\\n   blk_sync_queue+0x22/0x40 block/blk-core.c:222\\n   nvme_sync_queues+0x100/0x150 drivers/nvme/host/core.c:5362\\n   nvme_reset_work+0x138/0x930 drivers/nvme/host/pci.c:3264\\n\\n  Allocated by task 34:\\n   __blk_mq_alloc_disk+0x33/0x100 block/blk-mq.c:4462\\n   nvme_alloc_ns+0x290/0x3870 drivers/nvme/host/core.c:4146\\n\\n  Freed by task 0:\\n   blk_free_queue_rcu+0x3a/0x50 block/blk-core.c:254\\n   rcu_core+0xc10/0x1730 kernel/rcu/tree.c:2857\\n\\nThe queue being synced there is ctrl-\u003eadmin_q, only a victim sharing a\\ntimer wheel bucket with the freed queue\u0027s dangling entry; other runs\\ntripped in enqueue_timer(), __run_timers() or blk_mq_timeout_work().\\nFailing nvme_alloc_ns() with a debug patch makes it deterministic: one\\nleaked timer trips KASAN within seconds, while 1987 patched releases\\nproduced no splat.\\n\\nStop the timer and the queue work items before blk_mq_exit_queue(), like\\nblk_mq_destroy_queue() does.\\n\\nFound by FuzzNvme.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"block/genhd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"6ae7364f68e6c7af6b6df4bbb14040b89e5975d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"6f06dbe5012c160e0dba418a5a9cb16c456ad46a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"1a0ae4d502062a2759f2a92d12bdeab3c64c7372\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"bb03b56d1d754908a37a160603be21769da423cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"93d620519d71dfc6ee64b5baea74f1d85d4439fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f8191fdf41d3a53cc1d63fe2234e812c55a0092\",\"lessThan\":\"26cb8ebbfaf713c82e142d08828d4d765057633b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d27b66257db183fe11c10f31246ae965adb005d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.19.12\",\"lessThan\":\"5.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"block/genhd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a0ae4d502062a2759f2a92d12bdeab3c64c7372\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26cb8ebbfaf713c82e142d08828d4d765057633b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ae7364f68e6c7af6b6df4bbb14040b89e5975d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f06dbe5012c160e0dba418a5a9cb16c456ad46a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93d620519d71dfc6ee64b5baea74f1d85d4439fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb03b56d1d754908a37a160603be21769da423cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T13:38:59+00:00",
      "cve": "CVE-2026-80589",
      "id": "CVE-2026-80589",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: block: stop the timeout timer when releasing a never added disk",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80589.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.