CVE-2021-3493

unknown KEV

Published 2022-10-20 · Modified 2022-10-20

CVSS v3

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CVSS v2

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VIR risk

1.5

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.

CISA KEV

Vendor: Linux
Product: Kernel
Due date: 2022-11-10

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cisa-kev — https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52; https://nvd.nist.gov/vuln/detail/CVE-2021-3493

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-3493

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-3493.html

Exploits

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`5.10.38-1`
debian	bullseye	fixed	`5.10.38-1`
debian	forky	fixed	`5.10.38-1`
debian	sid	fixed	`5.10.38-1`
debian	trixie	fixed	`5.10.38-1`

References

Verify integrity in audit chain (admin only). AS-IS.