CVE-2021-4149

Public Exploit

Description

A vulnerability was found in btrfs_alloc_tree_b in fs/btrfs/extent-tree.c in the Linux kernel due to an improper lock operation in btrfs. In this flaw, a user with a local privilege may cause a denial of service (DOS) due to a deadlock problem.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.01%
Third-Party Advisory redhat.com Third-Party Advisory debian.org Third-Party Advisory lkml.org Third-Party Advisory lkml.org
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2026485 issue tracking third party advisory
https://lkml.org/lkml/2021/10/18/885 mailing list patch exploit third party advisory
https://lkml.org/lkml/2021/9/13/2565 mailing list exploit third party advisory
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-4149?
CVE-2021-4149 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4149?
To fix CVE-2021-4149, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4149 being actively exploited in the wild?
It is possible that CVE-2021-4149 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4149?
CVE-2021-4149 affects n/a kernel.
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