CVE-2023-4911 kev in the critical feed json
Glibc: buffer overflow in ld.so leading to privilege escalation
published 2023-10-03 3 y ago modified 2026-11-07 2 d ago also EUVD-2023-54750
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2023-11-21
- epss
- 63.8%
- EPSS 63.8% chance of exploitation in 30 days, percentile 99.2%
- public exploits
- 2
- Metasploit, Exploit-DB
Summary
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.
Patch / fix
cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 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 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, 0:4.5.3-10.el8ev, 0:4.5.3-202312060823_8.6
- Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1
- glibc Debian 12 2.36-9+deb12u3
- glibc Debian 14, Debian 13 2.37-12
debian advisories DEBIAN-CVE-2023-4911
- glibc Ubuntu 22.04 LTS 2.35-0ubuntu3.4
- glibc Ubuntu 24.04 LTS 2.38-1ubuntu6
ubuntu advisories UBUNTU-CVE-2023-4911
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- redhat-virtualization-host rhev hypervisor 4.4 4.5.3-202312060823_8.6
- redhat-release-virtualization-host rhev hypervisor 4.4 4.5.3-10.el8ev
- redhat-virtualization-host-image-update rhev hypervisor 4.4 4.5.3-202312060823_8.6
- redhat-release-virtualization-host-content rhev hypervisor 4.4 4.5.3-10.el8ev
- redhat-virtualization-host-image-update-placeholder rhev hypervisor 4.4 4.5.3-10.el8ev
- glibc RHEL 9 2.34-60.el9_2.7
- nscd RHEL 9 2.34-60.el9_2.7
- libnsl RHEL 9 2.34-60.el9_2.7
red hat advisories RHSA-2024:0033RHSA-2023:5476RHSA-2023:5453RHSA-2023:5455RHSA-2023:5454
- glibc openSUSE Tumbleweed 2.38-4.1
opensuse advisories openSUSE-SU-2024:13294-1
- glibc AlmaLinux 9 2.34-60.el9_2.7
- nscd AlmaLinux 9 2.34-60.el9_2.7
- libnsl AlmaLinux 9 2.34-60.el9_2.7
- nss_db AlmaLinux 9 2.34-60.el9_2.7
- nss_hesiod AlmaLinux 9 2.34-60.el9_2.7
- glibc-utils AlmaLinux 9 2.34-60.el9_2.7
- glibc-common AlmaLinux 9 2.34-60.el9_2.7
- glibc-benchtests AlmaLinux 9 2.34-60.el9_2.7
almalinux advisories ALSA-2023:5453ALSA-2023:5455
- glibc Rocky Linux 8 2.28-225.el8_8.6
rocky linux advisories RLSA-2023:5455
- glibc CBL-Mariner 2.0 2.35-5
- glibc Azure Linux 3.0 2.38-6
azure linux advisories AZL-31117AZL-34733
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2023-4911 updated cvss 7.8
glibc: buffer overflow in ld.so leading to privilege escalation
-
Red Hat CodeReady Linux Builder EUS (v.8.6) nss_hesiod 2.28-189.6.el8_6, glibc-benchtests 2.28-189.6.el8_6fixed: vendor fix RHSA-2023:5476
-
Red Hat CodeReady Linux Builder EUS (v.9.0) nss_db 2.34-28.el9_0.4, nss_hesiod 2.34-28.el9_0.4, glibc-benchtests 2.34-28.el9_0.4fixed: vendor fix RHSA-2023:5454
-
Red Hat Enterprise Linux AppStream (v. 8) glibc-utils 2.28-225.el8_8.6, compat-libpthread-nonshared 2.28-225.el8_8.6fixed: vendor fix RHSA-2023:5455
-
Red Hat Enterprise Linux AppStream (v. 9) glibc-utils 2.34-60.el9_2.7, glibc-locale-source 2.34-60.el9_2.7fixed: vendor fix RHSA-2023:5453
-
Red Hat Enterprise Linux AppStream EUS (v.8.6) glibc-utils 2.28-189.6.el8_6, compat-libpthread-nonshared 2.28-189.6.el8_6fixed: vendor fix RHSA-2023:5476
-
Red Hat Enterprise Linux AppStream EUS (v.9.0) glibc-utils 2.34-28.el9_0.4, glibc-locale-source 2.34-28.el9_0.4fixed: vendor fix RHSA-2023:5454
-
Red Hat Enterprise Linux BaseOS (v. 8) nscd 2.28-225.el8_8.6, glibc 2.28-225.el8_8.6, libnsl 2.28-225.el8_8.6, nss_db 2.28-225.el8_8.6, glibc-common 2.28-225.el8_8.6, glibc-gconv-extra 2.28-225.el8_8.6, +3 morefixed: vendor fix RHSA-2023:5455
-
Red Hat Enterprise Linux BaseOS (v. 9) nscd 2.34-60.el9_2.7, glibc 2.34-60.el9_2.7, libnsl 2.34-60.el9_2.7, glibc-common 2.34-60.el9_2.7, glibc-gconv-extra 2.34-60.el9_2.7, glibc-all-langpacks 2.34-60.el9_2.7, +1 morefixed: vendor fix RHSA-2023:5453
show 7 moreshow fewer
-
Red Hat Enterprise Linux BaseOS EUS (v.8.6) nscd 2.28-189.6.el8_6, glibc 2.28-189.6.el8_6, libnsl 2.28-189.6.el8_6, nss_db 2.28-189.6.el8_6, glibc-common 2.28-189.6.el8_6, glibc-gconv-extra 2.28-189.6.el8_6, +3 morefixed: vendor fix RHSA-2023:5476
-
Red Hat Enterprise Linux BaseOS EUS (v.9.0) nscd 2.34-28.el9_0.4, glibc 2.34-28.el9_0.4, libnsl 2.34-28.el9_0.4, glibc-common 2.34-28.el9_0.4, glibc-gconv-extra 2.34-28.el9_0.4, glibc-all-langpacks 2.34-28.el9_0.4, +1 morefixed: vendor fix RHSA-2023:5454
-
Red Hat Enterprise Linux CRB (v. 8) nss_hesiod 2.28-225.el8_8.6, glibc-benchtests 2.28-225.el8_8.6fixed: vendor fix RHSA-2023:5455
-
Red Hat Enterprise Linux CRB (v. 9) nss_db 2.34-60.el9_2.7, nss_hesiod 2.34-60.el9_2.7, glibc-benchtests 2.34-60.el9_2.7fixed: vendor fix RHSA-2023:5453
-
Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host 4.5.3-202312060823_8.6, redhat-virtualization-host-image-update 4.5.3-202312060823_8.6fixed: vendor fix RHSA-2023:5476
-
Red Hat RHEL 8-based RHEV-H for RHEV 4 (build requirements) redhat-release-virtualization-host 4.5.3-10.el8ev, redhat-release-virtualization-host-content 4.5.3-10.el8ev, redhat-virtualization-host-image-update-placeholder 4.5.3-10.el8evfixed: vendor fix RHSA-2024:0033
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Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, glibc-common Red Hat Enterprise Linux 7 nscd, glibc, glibc-utils, compat-glibc, glibc-commonnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
cisa ICSA-25-162-05 updated cvss 7.8
Siemens SIMATIC S7-1500 CPU family
-
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.5affected: mitigation, no fix available
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
cisa ICSA-23-166-10 updated cvss 7.8
Siemens SIMATIC S7-1500 TM MFP BIOS
-
Siemens SIMATIC S7-1500 TM MFP - BIOS <V1.3.0affected: fixed in V1.3.0, workaround support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
cisa ICSA-23-166-11 updated cvss 7.8
Siemens SIMATIC S7-1500 TM MFP Linux Kernel
-
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem <V1.1affected: fixed in V1.1, workaround support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
Timeline
- First public exploit (Metasploit exploit/linux/local/glibc_tunables_priv_esc)
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 2 y ago
- Patch by
- 2023-12-12 (2 y ago)
- Ransomware
- Not known
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Vendor, product
- GNU, GNU C Library
- CISA name
- GNU C Library Buffer Overflow Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- total
- Assessed
- 12 mo ago
Exploit prediction
63.77% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/linux/local/glibc_tunables_priv_esc Glibc Tunables Privilege Escalation CVE-2023-4911 (aka Looney Tunables) metasploit exploit, excellent rank, 2023-10-03
- EDB-52479 glibc 2.38 - Buffer Overflow local, 2026-02-11
- qualys.com https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified
- seclists.org http://seclists.org/fulldisclosure/2023/Oct/11 referenced PoC, tagged "exploit" by a source, unverified
- openwall.com http://www.openwall.com/lists/oss-security/2023/10/03/2 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
- Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
- Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classification
References
-
bugzilla.redhat.com
/show_bug.cgi?id=2238352
issue-tracking, patch
-
qualys.com
/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
exploit, third-party-advisory
-
exploit-db.com
/exploits/52479
exploit, third-party-advisory, vdb-entry
-
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
-
openwall.com
/lists/oss-security/2023/10/03/2
exploit, mailing-list
-
access.redhat.com
/errata/RHSA-2023:5453
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2023:5454
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2023:5455
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2023:5476
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2024:0033
vendor-advisory, third-party-advisory
-
access.redhat.com
/security/cve/CVE-2023-4911
vdb-entry, third-party-advisory
-
qualys.com
/cve-2023-4911/
third-party-advisory
-
openwall.com
/lists/oss-security/2023/10/03/3
mailing-list
-
openwall.com
/lists/oss-security/2023/10/05/1
mailing-list
-
openwall.com
/lists/oss-security/2023/10/13/11
mailing-list
-
openwall.com
/lists/oss-security/2023/10/14/3
mailing-list
-
openwall.com
/lists/oss-security/2023/10/14/5
mailing-list
-
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
-
debian.org
/security/2023/dsa-5514
mailing-list
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911
government-resource, us-government-resource
-
cert-portal.siemens.com
/productcert/html/ssa-831302.html
third-party-advisory
-
cert-portal.siemens.com
/productcert/html/ssa-794697.html
third-party-advisory
-
cert-portal.siemens.com
/productcert/html/ssa-082556.html
third-party-advisory
Sources
- CVE List CVE-2023-4911
- NVD CVE-2023-4911
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.