CVE-2023-4911
KEVGNU C Library Buffer Overflow Vulnerability
Description
GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.
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.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HPublishedOct 3, 2023
Last modifiedOct 14, 2026
Added to KEVNov 21, 2023
Remediation dueDec 12, 2023
References
- access.redhat.com/errata/RHSA-2023:5453Third Party Advisory
- access.redhat.com/errata/RHSA-2023:5454Third Party Advisory
- access.redhat.com/errata/RHSA-2023:5455Third Party Advisory
- access.redhat.com/errata/RHSA-2023:5476Third Party Advisory
- access.redhat.com/errata/RHSA-2024:0033Third Party Advisory
- access.redhat.com/security/cve/CVE-2023-4911Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2238352Issue TrackingPatch
- qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txtExploitThird Party Advisory
- qualys.com/cve-2023-4911/Third Party Advisory
- packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.htmlExploitThird Party Advisory
- packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.htmlExploitThird Party Advisory
- seclists.org/fulldisclosure/2023/Oct/11ExploitMailing List
0 recent articles mention this CVE
75
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1050 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 63.8% · top 1% of all CVEs
- Weakness
- CWE-122
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.