CVE-2021-47356

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

21/05/2024

Last modified:

02/04/2025

Description

In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible use-after-free in HFC_cleanup() This module&#39;s remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver&#39;s remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

Impact

Vector 3.x

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

Base Score: 7.70 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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

Base Score 3.x

7.70

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::		4.4.276 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.5 (including)	4.9.276 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.240 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.198 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.133 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.51 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.12.18 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.13 (including)	5.13.3 (excluding)

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

CVE-2021-47356

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools