{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80589","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.770Z","datePublished":"2026-08-26T14:37:43.293Z","dateUpdated":"2026-08-27T05:02:10.391Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-27T05:02:10.391Z"},"descriptions":[{"lang":"en","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->timeout, 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->queue 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->admin_q, only a victim sharing a\ntimer wheel bucket with the freed queue's 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."}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","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->timeout) 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->admin_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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"],"versions":[{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"6ae7364f68e6c7af6b6df4bbb14040b89e5975d0","status":"affected","versionType":"git"},{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"6f06dbe5012c160e0dba418a5a9cb16c456ad46a","status":"affected","versionType":"git"},{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"1a0ae4d502062a2759f2a92d12bdeab3c64c7372","status":"affected","versionType":"git"},{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"bb03b56d1d754908a37a160603be21769da423cf","status":"affected","versionType":"git"},{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"93d620519d71dfc6ee64b5baea74f1d85d4439fb","status":"affected","versionType":"git"},{"version":"6f8191fdf41d3a53cc1d63fe2234e812c55a0092","lessThan":"26cb8ebbfaf713c82e142d08828d4d765057633b","status":"affected","versionType":"git"},{"version":"d27b66257db183fe11c10f31246ae965adb005d3","status":"affected","versionType":"git"},{"version":"5.19.12","lessThan":"5.20","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/genhd.c"],"versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.1.184","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.153","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.105","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.46","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.10","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.1.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19.12"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6ae7364f68e6c7af6b6df4bbb14040b89e5975d0"},{"url":"https://git.kernel.org/stable/c/6f06dbe5012c160e0dba418a5a9cb16c456ad46a"},{"url":"https://git.kernel.org/stable/c/1a0ae4d502062a2759f2a92d12bdeab3c64c7372"},{"url":"https://git.kernel.org/stable/c/bb03b56d1d754908a37a160603be21769da423cf"},{"url":"https://git.kernel.org/stable/c/93d620519d71dfc6ee64b5baea74f1d85d4439fb"},{"url":"https://git.kernel.org/stable/c/26cb8ebbfaf713c82e142d08828d4d765057633b"}],"title":"block: stop the timeout timer when releasing a never added disk","x_generator":{"engine":"bippy-1.2.0"}}}}