CVE-2026-80589

Status: UPDATED  |  Advisory ID: CVE-2026-80589

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References