Coverage › CVE-2021-3493
CVE-2021-3493 Unmapped
Linux Kernel Privilege Escalation Vulnerability
- Vendor / product
- Linux — Kernel
- Description (CISA)
- The overlayfs stacking file system in Linux kernel does not properly validate the application of file capabilities against user namespaces, which could lead to privilege escalation.
- Added to KEV
- 2022-10-20
- Due date
- 2022-11-10
- Required action
- Apply updates per vendor instructions.
- Known ransomware use
- Unknown
- CWE
- CWE-862
- CISA notes
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52
https://nvd.nist.gov/vuln/detail/CVE-2021-3493 - Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2021-3493. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-862) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.