CVE-2023-4911 HIGH

CVE-2023-4911: Glibc: buffer overflow in ld.so leading to privilege escalation

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-122
KEV Status Known Exploited
Published October 3, 2023
Last update May 12, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA Required Action

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

Key dates

03Disclosure timeline

October 3, 2023 CVE published
May 12, 2026 Record updated