Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2023-4911

CVE-2023-4911HIGH

Glibc: buffer overflow in ld.so leading to privilege escalation

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .8142   99.6   YES

AFFECTED
  Product                                                  Versions     Fixed
  glibc                                                    2.34 –       —
  Red Hat Enterprise Linux 8                               unspecified  0:2.28-225.el8_8.6
  Red Hat Enterprise Linux 8                               unspecified  0:2.28-225.el8_8.6
  Red Hat Enterprise Linux 8.6 Extended Update Support     unspecified  0:2.28-189.6.el8_6
  Red Hat Enterprise Linux 9                               unspecified  0:2.34-60.el9_2.7
  Red Hat Enterprise Linux 9                               unspecified  0:2.34-60.el9_2.7
  Red Hat Enterprise Linux 9.0 Extended Update Support     unspecified  0:2.34-28.el9_0.4
  Red Hat Virtualization 4 for Red Hat Enterprise Linux 8  unspecified  0:2.28-189.6.el8_6
  Red Hat Virtualization 4 for Red Hat Enterprise Linux 8  unspecified  0:4.5.3-10.el8ev
  Red Hat Virtualization 4 for Red Hat Enterprise Linux 8  unspecified  0:4.5.3-202312060823_8.6
  + 3 more

TIMELINE
  Sep 12  Reserved by redhat
  Oct 3   Published (CNA: redhat)
  Nov 21  Added to CISA KEV, remediation due 2023-12-12

CWE-122 · CNA: redhat · CVSS v3.1 · 30 references · KEV due December 12, 2023

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 12, 2023	Reserved	Reserved by redhat
October 3, 2023	Published	Published (CNA: redhat)
November 21, 2023	KEV ADDED	Added to CISA KEV, remediation due 2023-12-12

Affected

Affected products and packages — 13 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
—	glibc	—	2.34	—
Red Hat	Red Hat Enterprise Linux 8	—	—	0:2.28-225.el8_8.6
Red Hat	Red Hat Enterprise Linux 8	—	—	0:2.28-225.el8_8.6
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	—	—	0:2.28-189.6.el8_6
Red Hat	Red Hat Enterprise Linux 9	—	—	0:2.34-60.el9_2.7
Red Hat	Red Hat Enterprise Linux 9	—	—	0:2.34-60.el9_2.7
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	—	—	0:2.34-28.el9_0.4
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	—	—	0:2.28-189.6.el8_6
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	—	—	0:4.5.3-10.el8ev
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	—	—	0:4.5.3-202312060823_8.6
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—

Weaknesses

CWE-122

References (30)

http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html [x_transferred]
http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html [x_transferred]
http://seclists.org/fulldisclosure/2023/Oct/11 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/03/2 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/03/3 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/05/1 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/13/11 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/14/3 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/14/5 [x_transferred]
http://www.openwall.com/lists/oss-security/2023/10/14/6 [x_transferred]
https://access.redhat.com/errata/RHSA-2023:5453 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2023:5454 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2023:5455 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2023:5476 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2024:0033 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2023-4911 [vdb-entry, x_refsource_REDHAT]
https://bugzilla.redhat.com/show_bug.cgi?id=2238352 [issue-tracking, x_refsource_REDHAT]
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-794697.html
https://cert-portal.siemens.com/productcert/html/ssa-831302.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ [x_transferred]
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ [x_transferred]
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ [x_transferred]
https://security.gentoo.org/glsa/202310-03 [x_transferred]
https://security.netapp.com/advisory/ntap-20231013-0006/ [x_transferred]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911 [government-resource]
https://www.debian.org/security/2023/dsa-5514 [x_transferred]
https://www.exploit-db.com/exploits/52479
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
https://www.qualys.com/cve-2023-4911/

Authoritative record: CVE-2023-4911 at cve.org

Vendors: red hat

Weaknesses: CWE-122

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-4911 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.