CVE-2021-3493 — Linux Kernel Privilege Escalation Vulnerability

provenance: imported · CVE: CVE-2021-3493

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

References

NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3493
KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog