Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2022-49995

Severity CVSS v4.0:
Pending analysis
Type:
CWE-416 Use After Free
Publication date:
18/06/2025
Last modified:
14/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> writeback: avoid use-after-free after removing device<br /> <br /> When a disk is removed, bdi_unregister gets called to stop further<br /> writeback and wait for associated delayed work to complete. However,<br /> wb_inode_writeback_end() may schedule bandwidth estimation dwork after<br /> this has completed, which can result in the timer attempting to access the<br /> just freed bdi_writeback.<br /> <br /> Fix this by checking if the bdi_writeback is alive, similar to when<br /> scheduling writeback work.<br /> <br /> Since this requires wb-&gt;work_lock, and wb_inode_writeback_end() may get<br /> called from interrupt, switch wb-&gt;work_lock to an irqsafe lock.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.15 (including) 5.15.64 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 5.19.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools