CVE-2021-3493
Linux Kernel Privilege Escalation Vulnerability
7.8
HIGH
CVSS 3.1
⚠ KEVEPSS 80.0%
Description
The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.
How to fix CVE-2021-3493
To remediate CVE-2021-3493, upgrade the affected package to a fixed version below.
- —upgrade to 5.10.38-1 or later
Is CVE-2021-3493 being exploited?
Yes — CVE-2021-3493 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.
Affected packages (1)
- from 0, < 5.10.38-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |