What is CVE-2021-47294?

CVE-2021-47294 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2021-47294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47294?

CVE-2021-47294 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47294?

No patch is currently available for CVE-2021-47294. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-47294 actively exploited?

CVE-2021-47294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47294

Medium

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.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-06-23

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-672

CVE-2021-47294 is classified as CWE-672

See CWE-672 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2021-47294 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3
Patch
Kernel patch commit
https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef
Patch
Kernel patch commit
https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2021-47294

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-06-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-47294?

CVE-2021-47294 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2021-47294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47294?

CVE-2021-47294 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47294?

No patch is currently available for CVE-2021-47294. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-47294 actively exploited?

No — CVE-2021-47294 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.