Improper Access Control Affecting linux-qemu-melange package, versions <6.18.16-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.75% (52nd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXQEMUMELANGE-15338393
  • published24 Feb 2026
  • disclosed26 Aug 2022

Introduced: 26 Aug 2022

CVE-2021-3864  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-qemu-melange to version 6.18.16-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-qemu-melange package and not the linux-qemu-melange package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants. The prerequisite is a SUID binary that sets real UID equal to effective UID, and real GID equal to effective GID. The descendant will then have a dumpable value set to 1. As a result, if the descendant process crashes and core_pattern is set to a relative value, its core dump is stored in the current directory with uid:gid permissions. An unprivileged local user with eligible root SUID binary could use this flaw to place core dumps into root-owned directories, potentially resulting in escalation of privileges.

CVSS Base Scores

version 3.1