CVE-2025-37759

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ublk: fix handling recovery & reissue in ublk_abort_queue()

Commit 8284066946e6 ("ublk: grab request reference when the request is handled

by userspace") doesn't grab request reference in case of recovery reissue.

Then the request can be requeued & re-dispatch & failed when canceling

uring command.

If it is one zc request, the request can be freed before io_uring

returns the zc buffer back, then cause kernel panic:

[ 126.773061] BUG: kernel NULL pointer dereference, address: 00000000000000c8

[ 126.773657] #PF: supervisor read access in kernel mode

[ 126.774052] #PF: error_code(0x0000) - not-present page

[ 126.774455] PGD 0 P4D 0

[ 126.774698] Oops: Oops: 0000 [#1] SMP NOPTI

[ 126.775034] CPU: 13 UID: 0 PID: 1612 Comm: kworker/u64:55 Not tainted 6.14.0_blk+ #182 PREEMPT(full)

[ 126.775676] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39 04/01/2014

[ 126.776275] Workqueue: iou_exit io_r

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References