CVE-2026-22995 - ublk: fix use-after-free in ublk_partition_scan_work

CVE-2026-22995 - ublk: fix use-after-free in ublk_partition_scan_work

https://cvefeed.io/rssfeed/latest.atom / Fri, 01/23/2026 - 19:58
CVE ID : CVE-2026-22995
Published : Jan. 23, 2026, 4:15 p.m. | 58 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: ublk: fix use-after-free in ublk_partition_scan_work A race condition exists between the async partition scan work and device teardown that can lead to a use-after-free of ub->ub_disk: 1. ublk_ctrl_start_dev() schedules partition_scan_work after add_disk() 2. ublk_stop_dev() calls ublk_stop_dev_unlocked() which does: - del_gendisk(ub->ub_disk) - ublk_detach_disk() sets ub->ub_disk = NULL - put_disk() which may free the disk 3. The worker ublk_partition_scan_work() then dereferences ub->ub_disk leading to UAF Fix this by using ublk_get_disk()/ublk_put_disk() in the worker to hold a reference to the disk during the partition scan. The spinlock in ublk_get_disk() synchronizes with ublk_detach_disk() ensuring the worker either gets a valid reference or sees NULL and exits early. Also change flush_work() to cancel_work_sync() to avoid running the partition scan work unnecessarily when the disk is already detached.
Severity: 0.0 | NA
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