CVE-2023-4911
Glibc: buffer overflow in ld.so leading to privilege escalation
- Published
- Oct 3, 2023
- Updated
- Oct 14, 2026
- Assigning CNA
- redhat
- Evidence observed
- Nov 21, 2023
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.2%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
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.
Sources
modules/exploits/linux/local/glibc_tunables_priv_esc.rb
Metasploit Framework modulesDeclared conditions
- platform: Linux,Unix($.exploit_linux/local/glibc_tunables_priv_esc.platform)
- verification: check_declared($.exploit_linux/local/glibc_tunables_priv_esc.check)
- CVE-2023-4911-LabResearch
Docker-based CVE-2023-4911 lab for analyzing glibc ld.so buffer overflow and developing a local privilege escalation exploit with GDB debugging.
Responsible use
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