vulnerability
Ubuntu: (Multiple Advisories) (CVE-2025-37759): Linux kernel vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | May 1, 2025 | Jun 26, 2025 | Feb 13, 2026 |
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_ring_exit_work
[ 126.776651] RIP: 0010:ublk_io_release+0x14/0x130 [ublk_drv]
Fixes it by always grabbing request reference for aborting the request.
Solutions
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