CVE Feed

    Dashboard / CVE / CVE-2023-4911

    CVE-2023-4911

    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.

    Published:Oct 3, 2023
    Last Modified:May 12, 2026
    EPS:Oct 3, 2023
    EPSS Score:0.71534
    CVSS Score:7.8

    CISA Notification

    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.

    Required Action:

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

    Notes:

    No extra notes provided.

    Due Date
    Dec 12, 2023
    1004 days ago
    Alert Date
    Nov 21, 2023
    1025 days ago

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnu
    Product
    Glibc
    Vendor
    Netapp
    Product
    Bootstrap Os
    Vendor
    Netapp
    Product
    H300s
    Vendor
    Netapp
    Product
    H300s Firmware
    Vendor
    Netapp
    Product
    H410c
    Vendor
    Netapp
    Product
    H410c Firmware
    Vendor
    Netapp
    Product
    H410s
    Vendor
    Netapp
    Product
    H410s Firmware
    Vendor
    Netapp
    Product
    H500s
    Vendor
    Netapp
    Product
    H500s Firmware
    Vendor
    Netapp
    Product
    H700s
    Vendor
    Netapp
    Product
    H700s Firmware
    Vendor
    Netapp
    Product
    Hci Compute Node
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Redhat
    Product
    Codeready Linux Builder
    Vendor
    Redhat
    Product
    Codeready Linux Builder Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Arm64
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Arm64 Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Ibm Z Systems
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Ibm Z Systems Eus
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Power Little Endian
    Vendor
    Redhat
    Product
    Codeready Linux Builder For Power Little Endian Eus
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64
    Vendor
    Redhat
    Product
    Enterprise Linux For Arm 64 Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Ibm Z Systems Eus S390x
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Big Endian Eus
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian
    Vendor
    Redhat
    Product
    Enterprise Linux For Power Little Endian Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions
    Vendor
    Redhat
    Product
    Enterprise Linux Server Tus
    Vendor
    Redhat
    Product
    Enterprise Linux Update Services For Sap Solutions
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhev Hypervisor
    Vendor
    Redhat
    Product
    Virtualization
    Vendor
    Redhat
    Product
    Virtualization Host
    Vendor
    Siemens
    Product
    Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp
    Vendor
    Siemens
    Product
    Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
    Vendor
    Siemens
    Product
    Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp
    Vendor
    Siemens
    Product
    Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware
    Vendor
    Siemens
    Product
    Simatic S7-1500 Tm Mfp
    Vendor
    Siemens
    Product
    Simatic S7-1500 Tm Mfp Firmware
    Vendor
    Siemens
    Product
    Siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp
    Vendor
    Siemens
    Product
    Siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware

    Exploits

    https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txthttp://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.htmlhttp://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.htmlhttp://seclists.org/fulldisclosure/2023/Oct/11http://www.openwall.com/lists/oss-security/2023/10/03/2https://www.exploit-db.com/exploits/52479https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txthttps://www.exploit-db.com/exploits/52479https://github.com/0xMOGA/CVE-2023-4911-Labhttps://github.com/Aryan20057/CVE-2023-4911https://github.com/baeseungwon1010/CVE-2023-4911https://github.com/Billar42/CVE-2023-4911https://github.com/chaudharyarjun/LooneyPwnerhttps://github.com/Diego-AltF4/CVE-2023-4911https://github.com/Green-Avocado/CVE-2023-4911https://github.com/guffre/CVE-2023-4911https://github.com/hadrian3689/looney-tunables-CVE-2023-4911https://github.com/jarpex/cve-2023-4911-exploit-optimizedhttps://github.com/KernelKrise/CVE-2023-4911https://github.com/KillReal01/CVE-2023-4911https://github.com/leesh3288/CVE-2023-4911https://github.com/NishanthAnand21/CVE-2023-4911-PoChttps://github.com/puckiestyle/CVE-2023-4911https://github.com/RickdeJager/CVE-2023-4911https://github.com/RRespxwnss/Looney-Tunables-CVE-2023-4911https://github.com/ruycr4ft/CVE-2023-4911https://github.com/shacojx/CVE-2023-4911-Exploithttps://github.com/silent6trinity/looney-tuneableshttps://github.com/snurkeburk/Looney-Tunableshttps://github.com/teraGL/looneyCVEhttps://github.com/xiaoQ1z/CVE-2023-4911

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    https://access.redhat.com/errata/RHSA-2023:5453
    https://access.redhat.com/errata/RHSA-2023:5454
    https://access.redhat.com/errata/RHSA-2023:5455
    https://access.redhat.com/errata/RHSA-2023:5476
    https://access.redhat.com/errata/RHSA-2024:0033
    https://access.redhat.com/security/cve/CVE-2023-4911
    https://bugzilla.redhat.com/show_bug.cgi?id=2238352
    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/
    http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html
    http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html
    http://seclists.org/fulldisclosure/2023/Oct/11
    http://www.openwall.com/lists/oss-security/2023/10/03/2
    http://www.openwall.com/lists/oss-security/2023/10/03/3
    http://www.openwall.com/lists/oss-security/2023/10/05/1
    http://www.openwall.com/lists/oss-security/2023/10/13/11
    http://www.openwall.com/lists/oss-security/2023/10/14/3
    http://www.openwall.com/lists/oss-security/2023/10/14/5
    http://www.openwall.com/lists/oss-security/2023/10/14/6
    https://access.redhat.com/errata/RHSA-2023:5453
    https://access.redhat.com/errata/RHSA-2023:5454
    https://access.redhat.com/errata/RHSA-2023:5455
    https://access.redhat.com/errata/RHSA-2023:5476
    https://access.redhat.com/errata/RHSA-2024:0033
    https://access.redhat.com/security/cve/CVE-2023-4911
    https://bugzilla.redhat.com/show_bug.cgi?id=2238352
    https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/
    https://security.gentoo.org/glsa/202310-03
    https://security.netapp.com/advisory/ntap-20231013-0006/
    https://www.debian.org/security/2023/dsa-5514
    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/
    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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High