CVE-2021-3493 — Linux Kernel Privilege Escalation Vulnerability
CVE-2021-3493: Linux Kernel Privilege Escalation Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | Linux |
| Product | Kernel |
| Date added | 2022-10-20 |
| Due date | 2022-11-10 |
| Ransomware campaign use | Unknown |
Description
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.
Required action (CISA)
Apply updates per vendor instructions.
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
Weakness behind it
CISA records this vulnerability as an instance of CWE-862. From there the chain continues into CAPEC attack patterns and ATT&CK techniques, all inside this corpus.
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3493
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
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