Vulnerability · Published Mar 7, 2022 · Assigned by redhat
CVE-2021-3732
Medium 5.5
In plain English
A medium-severity information exposure 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 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.4%top 70.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
| Debian:12 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3732 |
| Debian:13 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3732 |
| Debian:14 | linux | 5.14.6-1 | DEBIAN-CVE-2021-3732 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2021-3732 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2021-3732 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2021-3732 |
Affected products (as reported)
Weakness: CWE-200
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1995249 x_refsource_MISC
- https://ubuntu.com/security/CVE-2021-3732 x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631 x_refsource_MISC
- https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631 x_refsource_MISC