CVE-2023-4911

CVE-2023-4911 is a high-severity vulnerability in Redhat Codeready Linux Builder with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-11-21). The underlying weakness is classified as CWE-787.

Key facts

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.

Frequently asked questions

What is CVE-2023-4911?
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.
How severe is CVE-2023-4911?
CVE-2023-4911 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-4911 being actively exploited?
Yes. CVE-2023-4911 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-11-21, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-4911?
CVE-2023-4911 primarily affects Redhat Codeready Linux Builder. In total, 73 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-4911?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-4911 have an EU (EUVD) identifier?
Yes. CVE-2023-4911 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-54750. It is also flagged as exploited in the EUVD (since 2023-11-21).
When was CVE-2023-4911 published?
CVE-2023-4911 was published on 2023-10-03 and last updated on 2026-06-17.

References

Affected products (73)

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