Vulnerability · Published Mar 7, 2022 · Assigned by redhat
CVE-2021-3739
High 7.1
In plain English
A high-severity null pointer dereference in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.1High
Exploit odds (30 days)0.6%top 50.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3739 |
| Debian:13 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3739 |
| Debian:14 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3739 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2021-3739 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2021-3739 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2021-3739 |
Affected products (as reported)
Weakness: CWE-476
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1997958 x_refsource_MISC
- https://ubuntu.com/security/CVE-2021-3739 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/08/25/3 x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091 x_refsource_MISC
- https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20220407-0006/ x_refsource_CONFIRM