Vulnerability · Published Mar 23, 2022 · Assigned by redhat
CVE-2021-4149
Medium 5.5
In plain English
A medium-severity security flaw in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 65.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.14.16-1 | DEBIAN-CVE-2021-4149 |
| Debian:13 | linux | 5.14.16-1 | DEBIAN-CVE-2021-4149 |
| Debian:14 | linux | 5.14.16-1 | DEBIAN-CVE-2021-4149 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2021-4149 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2021-4149 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2021-4149 |
Affected products (as reported)
Weakness: CWE-667
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2026485 x_refsource_MISC
- https://lkml.org/lkml/2021/10/18/885 x_refsource_MISC
- https://lkml.org/lkml/2021/9/13/2565 x_refsource_MISC
- [debian-lts-announce] 20220701 [SECURITY] [DLA 3065-1] linux security update mailing-list, x_refsource_MLIST