CVE-2021-3493
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
linux kernel
- Vendor
- Ubuntu
- Product
- linux kernel
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.8 kernel | affected | custom | 5.8.0-50.56 | Unavailable | None listed |
| 5.4 kernel | affected | custom | 5.4.0-72.80 | Unavailable | None listed |
| 4.15 kernel | affected | custom | 4.15.0-142.146 | Unavailable | None listed |
| 4.4 kernel | affected | custom | 4.4.0-209.241 | Unavailable | None listed |