CVEvulnerability
CVE-2021-3864
7.0 HIGH
Official page ↗
- Status
- Modified
- Published
- 2022-08-26
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-284
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.
Affected configurations
• linux linux kernel
• debian debian linux 10.0
• debian debian linux 11.0
• redhat enterprise linux 6.0
• redhat enterprise linux 7.0
• redhat enterprise linux 9.0
Related
Weakness · CWE (1)
- CWE-284 Improper Access Control weakness
References
- https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking, Patch, Third Party Advisory
- https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ lore.kernel.org
- https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ lore.kernel.org
- https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ lore.kernel.org
- https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit, Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking, Patch, Third Party Advisory
- https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ lore.kernel.org
- https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ lore.kernel.org
- https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ lore.kernel.org
- https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit, Mailing List, Third Party Advisory