{"id":"CVE-2026-80589","title":"block: stop the timeout timer when releasing a never added disk","summary":"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(), bu…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0","Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 6f06dbe5012c160e0dba418a5a9cb16c456ad46a","Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 1a0ae4d502062a2759f2a92d12bdeab3c64c7372","Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < bb03b56d1d754908a37a160603be21769da423cf","Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 93d620519d71dfc6ee64b5baea74f1d85d4439fb","Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 26cb8ebbfaf713c82e142d08828d4d765057633b","Linux d27b66257db183fe11c10f31246ae965adb005d3","Linux >= 5.19.12 < 5.20","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:18:09.871712Z"},"published":"2026-08-26","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:29.099Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80589","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"}],"tags":["cve.org"],"epss":0.0037,"epssPercentile":0.29399,"ingestedAt":"2026-10-16T19:46:24.310Z","slug":"CVE-2026-80589","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0`\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 6f06dbe5012c160e0dba418a5a9cb16c456ad46a`\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 1a0ae4d502062a2759f2a92d12bdeab3c64c7372`\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < bb03b56d1d754908a37a160603be21769da423cf`\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 93d620519d71dfc6ee64b5baea74f1d85d4439fb`\n- `Linux >= 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 < 26cb8ebbfaf713c82e142d08828d4d765057633b`\n- `Linux d27b66257db183fe11c10f31246ae965adb005d3`\n- `Linux >= 5.19.12 < 5.20`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}