Vulnerability in Linux Kernel
CVE-2021-4149
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.
EPSS: 0.004 (32.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux Linux_kernel — versions 5.15
- Debian Debian_linux — versions 9.0
- N/a Kernel — versions kernel 5.15 rc6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Exploit, Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Exploit, Mailing List, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4149?
- CVE-2021-4149 is a medium-severity vulnerability in Linux Kernel, classified under Improper Locking. CVSS score: 5.5/10. Published 2022-03-23.
- How severe is CVE-2021-4149?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-4149 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.