CVE-2023-4911

Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 9

Published 3 Oct 2023 · updated 17 Jun 2026 · Analyzed

7.8 High · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 21 Nov 2023, with a remediation deadline of 12 Dec 2023 for US federal agencies.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

References

access.redhat.com/errata/RHSA-2023:5453 · Third Party Advisory
access.redhat.com/errata/RHSA-2023:5454 · Third Party Advisory
access.redhat.com/errata/RHSA-2023:5455 · Third Party Advisory
access.redhat.com/errata/RHSA-2023:5476 · Third Party Advisory
access.redhat.com/errata/RHSA-2024:0033 · Third Party Advisory
access.redhat.com/security/cve/CVE-2023-4911 · Third Party Advisory
bugzilla.redhat.com/show_bug.cgi?id=2238352 · Issue Tracking, Patch
www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt · Exploit, Third Party Advisory
www.qualys.com/cve-2023-4911/ · Third Party Advisory
packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html · Exploit, Third Party Advisory, VDB Entry
packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html · Exploit, Third Party Advisory, VDB Entry
seclists.org/fulldisclosure/2023/Oct/11 · Exploit, Mailing List, Third Party Advisory
www.openwall.com/lists/oss-security/2023/10/03/2 · Exploit, Mailing List
www.openwall.com/lists/oss-security/2023/10/03/3 · Mailing List
www.openwall.com/lists/oss-security/2023/10/05/1 · Mailing List
www.openwall.com/lists/oss-security/2023/10/13/11 · Mailing List
www.openwall.com/lists/oss-security/2023/10/14/3 · Mailing List
www.openwall.com/lists/oss-security/2023/10/14/5 · Mailing List
www.openwall.com/lists/oss-security/2023/10/14/6 · Mailing List
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ · Mailing List
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ · Mailing List
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ · Mailing List
security.gentoo.org/glsa/202310-03 · Third Party Advisory
security.netapp.com/advisory/ntap-20231013-0006/ · Third Party Advisory
www.debian.org/security/2023/dsa-5514 · Mailing List