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CVE-2026-80589— block: stop the timeout timer when releasing a never added disk

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： block: 在释放一个从未被添加的磁盘时停止超时定时器 对于在 之前探测失败的磁盘， 会撤销 的操作，但它仅调用了 。该函数中没有任何地方去停止 定时器，导致该定时器继续向前滚动：它会保持“待处理”状态直到其自身到期，而不是在最后一个请求完成时停止。因此，如果驱动在添加磁盘之前已经发出了任何 I/O 请求， 结构体仍被链接在一个定时器轮（timer wheel）的某个桶中时，就被释放了。 提交 （"block: simplify disk shutdown"）删除了原本用

AI Predicted 7.8 Difficulty: Hard

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 6f8191fdf41d3a53cc1d63fe2234e812c55a0092< 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0 affected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092< 6f06dbe5012c160e0dba418a5a9cb16c456ad46a affected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092< 1a0ae4d502062a2759f2a92d12bdeab3c64c7372 affected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092< bb03b56d1d754908a37a160603be21769da423cf affected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092< 93d620519d71dfc6ee64b5baea74f1d85d4439fb affected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092< 26cb8ebbfaf713c82e142d08828d4d765057633b affected
d27b66257db183fe11c10f31246ae965adb005d3 affected
5.19.12< 5.20 affected
… +8 more rows
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I. Basic Information for CVE-2026-80589

Vulnerability Information
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Vulnerability Title
block: stop the timeout timer when releasing a never added disk
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6f8191fdf41d3a53cc1d63fe2234e812c55a0092 ~ 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-80589

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III. Intelligence Information for CVE-2026-80589

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Patches & Fixes for CVE-2026-80589 (6)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80553 s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80545 s390/zcrypt: Improve EP11 CPRB length and overflow checks
CVE-2026-80543 s390/zcrypt: Pad trailing CCA or EP11 message with zeros
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80555 s390/vfio_ccw: Free all memory if cp_init() fails
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80556 mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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