n 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.
Configuration 1 (hide)
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26 Feb 2026, 17:13
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
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| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CWE | CWE-416 | |
| References | () https://git.kernel.org/stable/c/72e28774e9644c2bdbb4920842fbf77103a15a85 - Patch | |
| References | () https://git.kernel.org/stable/c/f0d385f6689f37a2828c686fb279121df006b4cb - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* |
23 Jan 2026, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2026-01-23 16:15
Updated : 2026-02-26 17:13
NVD link : CVE-2026-22995
Mitre link : CVE-2026-22995
CVE.ORG link : CVE-2026-22995
JSON object : View
Use After Free