VULNERABILITY INTELLIGENCE

CVE-2021-3864

CVSS score7 HIGH
EPSS probability0.78%
CISA KEVNot currently listed
Published2022-08-26
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • secalert@redhat.com: CWE-284
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references