CVE-2023-4911

7.8 high KEV · due 2023-12-12 exploit ×24 SSVC exploitation: active Analyzed

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.

Fix

Public exploits 24

Glibc Tunables Privilege Escalation CVE-2023-4911 (aka Looney Tunables) (exploit module) Metasploit · verified · 2023-10-03
glibc 2.38 - Buffer Overflow (local · linux) Exploit-DB · 2026-02-11
0xMOGA/CVE-2023-4911-Lab PoC on GitHub
Aryan20057/CVE-2023-4911 PoC on GitHub
Billar42/CVE-2023-4911 PoC on GitHub
Diego-AltF4/CVE-2023-4911 PoC on GitHub
Green-Avocado/CVE-2023-4911 PoC on GitHub
KernelKrise/CVE-2023-4911 PoC on GitHub
KillReal01/CVE-2023-4911 PoC on GitHub
NishanthAnand21/CVE-2023-4911-PoC PoC on GitHub
RickdeJager/CVE-2023-4911 PoC on GitHub
adewlee87-rgb/cve-2023-4911-looney-tunables PoC on GitHub
baeseungwon1010/CVE-2023-4911 PoC on GitHub
chaudharyarjun/LooneyPwner PoC on GitHub
guffre/CVE-2023-4911 PoC on GitHub
hadrian3689/looney-tunables-CVE-2023-4911 PoC on GitHub
jarpex/cve-2023-4911-exploit-optimized PoC on GitHub
leesh3288/CVE-2023-4911 PoC on GitHub
puckiestyle/CVE-2023-4911 PoC on GitHub
ruycr4ft/CVE-2023-4911 PoC on GitHub
and 4 more

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

CISA KEV required action · due 2023-12-12

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

Added to the catalog 2023-11-21. CISA KEV

Patch, vendor advisory and mitigation references on NVD 2

https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Issue Tracking, Patch
https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Issue Tracking, Patch

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

2026-10-15 00:45First seenCVSS 7.8 · in KEV · netapp, siemens, gnuNVD modified 2026-10-14 22:17

Affected (CPE criteria) 73

cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_tm_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder:9.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_eus:8.6:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_eus:9.2:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_eus:9.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_eus:9.6:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_arm64:9.0_aarch64:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:8.6:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.2_aarch64:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.4_aarch64:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.6_aarch64:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.2_s390x:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.4_s390x:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.6_s390x:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:8.6:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.2_ppc64le:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.4_ppc64le:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:9.6_ppc64le:*:*:*:*:*:*:*
cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_arm_64:9.0_aarch64:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.6_aarch64:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:9.2_aarch64:*:*:*:*:*:*:*
and 33 more

References 39

https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5454 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5476 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0033 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4911 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Issue Tracking, Patch
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt Exploit, Third Party Advisory
https://www.qualys.com/cve-2023-4911/ Third Party Advisory
http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2023/Oct/11 Exploit, Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/03/2 Exploit, Mailing List
http://www.openwall.com/lists/oss-security/2023/10/03/3 Mailing List
http://www.openwall.com/lists/oss-security/2023/10/05/1 Mailing List
http://www.openwall.com/lists/oss-security/2023/10/13/11 Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/3 Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/5 Mailing List
http://www.openwall.com/lists/oss-security/2023/10/14/6 Mailing List
https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5454 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5476 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0033 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4911 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2238352 Issue Tracking, Patch
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ Mailing List
https://security.gentoo.org/glsa/202310-03 Third Party Advisory
https://security.netapp.com/advisory/ntap-20231013-0006/ Third Party Advisory
https://www.debian.org/security/2023/dsa-5514 Mailing List
https://www.exploit-db.com/exploits/52479 Exploit, Third Party Advisory, VDB Entry
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt Exploit, Third Party Advisory
https://www.qualys.com/cve-2023-4911/ Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-794697.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-831302.html Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911 US Government Resource