CVE-2021-47294

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

21/05/2024

Last modified:

23/06/2025

Description

In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.

Impact

Vector 3.x

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

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	4.4.173 (including)	4.4.277 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.9.155 (including)	4.9.277 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.14.98 (including)	4.14.241 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.19.20 (including)	4.19.199 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.0 (including)	5.4.136 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.54 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.13.6 (excluding)
cpe:2.3:o:linux:linux_kernel:3.18.134:::::::*
cpe:2.3:o:linux:linux_kernel:4.20.7:::::::*
cpe:2.3:o:linux:linux_kernel:5.14:rc1::::::
cpe:2.3:o:linux:linux_kernel:5.14:rc2::::::

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

CVE-2021-47294

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools