CVE-2023-4911

HIGH7.8

CISA KEV

Published 2023-10-03 · Updated 2026-10-14 · Source secalert@redhat.com

Summary

CVE-2023-4911 is a high-severity (CVSS 7.8) vulnerability in GNU GNU C Library. CISA added it to the Known Exploited Vulnerabilities catalog on November 21, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by December 12, 2023. CISA does not currently list it as used in ransomware campaigns. GNU has 5 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 5 known-exploited GNU vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-122CWE-787

CISA Known-Exploited Vulnerability

Product: GNU — GNU C Library

Name: GNU C Library Buffer Overflow Vulnerability

Date added: 2023-11-21 · Due: 2023-12-12

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

References

View on NVD

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