CVE-2021-3998

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-3998

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-3998.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`2.34-1`
sles		affected
debian	bookworm	fixed	`2.33-4`
debian	bullseye	fixed	`0`
debian	forky	fixed	`2.33-4`
debian	sid	fixed	`2.33-4`
debian	trixie	fixed	`2.33-4`

References

https://www.suse.com/security/cve/CVE-2021-3998.html
https://security-tracker.debian.org/tracker/CVE-2021-3998

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