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CVE REMEDIATION GUIDE
CISA KEV · Known exploitedHighFixed-version data available

CVE-2023-4911 remediation guide

GNU GNU C Library

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.

Open CVE record
ProductGNU GNU C Library
Affected versions2.34, V3.1.5, >= 3.1.5, < 1.1, >= 2.34 < 2.39, 37, 38, 39, 9.0, 8.6, 9.2, 9.4, 9.6, 9.0 aarch64, 9.2 aarch64, 9.4 aarch64, 9.6 aarch64, 9.0 s390x, 9.2 s390x, 9.4 s390x
Fixed versions1.1, 2.39
Priority basisImmediate · CVSS 7.8 · EPSS 81.4%
01

Identify the affected asset

Confirm whether GNU GNU C Library is installed, record the deployed version and installation path, and identify exposed interfaces.

  • Record the product name, package or appliance identifier, and installed version.
  • Identify internet-facing, administrative, API, and internal access paths.
  • Preserve the pre-change configuration and relevant service logs.
02

Validate the affected-version match

Compare the deployed version with the affected range: 2.34, V3.1.5, >= 3.1.5, < 1.1, >= 2.34 < 2.39, 37, 38, 39, 9.0, 8.6, 9.2, 9.4, 9.6, 9.0 aarch64, 9.2 aarch64, 9.4 aarch64, 9.6 aarch64, 9.0 s390x, 9.2 s390x, 9.4 s390x. Treat incomplete inventory results as unresolved.

03

Prioritize with independent signals

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

04

Apply supported remediation

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

05

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

  • Confirm the expected version and package state.
  • Run a functional health check for critical service paths.
  • Review authentication, error, application, and security monitoring logs.
  • Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.