--- title: "CVE-2023-4911: Glibc: buffer overflow in ld.so leading… | CubePath" 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…" language: en source: https://cubepath.com/security/cve/CVE-2023-4911 --- # CVE-2023-4911: Glibc: buffer overflow in ld.so leading… | CubePath ## 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. Official description from the CVE record, published by redhat. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-4911) ## Key data ### CVSS 3.1 High 7.8 Score published by redhat in the CVE record. CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------------- | | Attack vector | Local | The attacker needs local access to the system, or to trick a user into running something. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | Low | A basic user account is needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.63769 (63.8% probability) Percentile 99.2% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog GNU C Library Buffer Overflow Vulnerability Added to the catalog Nov 21, 2023 Federal due date Dec 12, 2023 ### CISA assessment as of Oct 15, 2025 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-122](https://cwe.mitre.org/data/definitions/122.html) Heap-based Buffer Overflow ## Affected products Products listed in the CVE record, as the CNA published them. - glibc - affected: 2.34 up to before 2.39 - Red Hat Enterprise Linux 8 - unaffected: 0:2.28-225.el8\_8.6 up to before \* - Red Hat Enterprise Linux 8 - unaffected: 0:2.28-225.el8\_8.6 up to before \* - Red Hat Enterprise Linux 8.6 Extended Update Support - unaffected: 0:2.28-189.6.el8\_6 up to before \* - Red Hat Enterprise Linux 9 - unaffected: 0:2.34-60.el9\_2.7 up to before \* - Red Hat Enterprise Linux 9 - unaffected: 0:2.34-60.el9\_2.7 up to before \* - Red Hat Enterprise Linux 9.0 Extended Update Support - unaffected: 0:2.34-28.el9\_0.4 up to before \* - Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 - unaffected: 0:2.28-189.6.el8\_6 up to before \* - Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 - unaffected: 0:4.5.3-10.el8ev up to before \* - Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 - unaffected: 0:4.5.3-202312060823\_8.6 up to before \* ### Listed as not affected - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 7 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [RHSA-2023:5453](https://access.redhat.com/errata/RHSA-2023:5453) (access.redhat.com) vendor-advisory - [RHSA-2023:5454](https://access.redhat.com/errata/RHSA-2023:5454) (access.redhat.com) vendor-advisory - [RHSA-2023:5455](https://access.redhat.com/errata/RHSA-2023:5455) (access.redhat.com) vendor-advisory - [RHSA-2023:5476](https://access.redhat.com/errata/RHSA-2023:5476) (access.redhat.com) vendor-advisory - [RHSA-2024:0033](https://access.redhat.com/errata/RHSA-2024:0033) (access.redhat.com) vendor-advisory - [access.redhat.com/security/cve/CVE-2023-4911](https://access.redhat.com/security/cve/CVE-2023-4911) vdb-entry - [RHBZ#2238352](https://bugzilla.redhat.com/show%5Fbug.cgi?id=2238352) (bugzilla.redhat.com) issue-tracking - [qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-p…](https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt) - [qualys.com/cve-2023-4911](https://www.qualys.com/cve-2023-4911/) - [exploit-db.com/exploits/52479](https://www.exploit-db.com/exploits/52479) - [packetstormsecurity.com/files/174986/glibc-ld.so-Local-Priv…](http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html) - [packetstormsecurity.com/files/176288/Glibc-Tunables-Privile…](http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html) - [seclists.org/fulldisclosure/2023/Oct/11](http://seclists.org/fulldisclosure/2023/Oct/11) - [openwall.com/lists/oss-security/2023/10/03/2](http://www.openwall.com/lists/oss-security/2023/10/03/2) - [openwall.com/lists/oss-security/2023/10/03/3](http://www.openwall.com/lists/oss-security/2023/10/03/3) - [openwall.com/lists/oss-security/2023/10/05/1](http://www.openwall.com/lists/oss-security/2023/10/05/1) - [openwall.com/lists/oss-security/2023/10/13/11](http://www.openwall.com/lists/oss-security/2023/10/13/11) - [openwall.com/lists/oss-security/2023/10/14/3](http://www.openwall.com/lists/oss-security/2023/10/14/3) - [openwall.com/lists/oss-security/2023/10/14/5](http://www.openwall.com/lists/oss-security/2023/10/14/5) - [openwall.com/lists/oss-security/2023/10/14/6](http://www.openwall.com/lists/oss-security/2023/10/14/6) - [lists.fedoraproject.org/archives/list/package-announce@list…](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/) - [lists.fedoraproject.org/archives/list/package-announce@list…](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/) - [lists.fedoraproject.org/archives/list/package-announce@list…](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/) - [security.gentoo.org/glsa/202310-03](https://security.gentoo.org/glsa/202310-03) - [security.netapp.com/advisory/ntap-20231013-0006](https://security.netapp.com/advisory/ntap-20231013-0006/) - [debian.org/security/2023/dsa-5514](https://www.debian.org/security/2023/dsa-5514) ## Timeline 1. ID reserved Sep 12, 2023 2. Record published Oct 3, 2023 3. Added to CISA KEV Nov 21, 2023 4. Record last updated Nov 7, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:24 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)