CVE-2023-4911
HIGH severity · CVSS 7.8 · CWE-122 · actively exploited (CISA KEV)
7.8CVSS HIGH ● exploited
🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2023-11-21. US federal agencies must patch by 2023-12-12.
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)65%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=2238352 ↗
Additional information
- NVD record
- https://bugzilla.redhat.com/show_bug.cgi?id=2238352Patch
- https://access.redhat.com/errata/RHSA-2023:5453Advisory
- https://access.redhat.com/errata/RHSA-2023:5454Advisory
- https://access.redhat.com/errata/RHSA-2023:5455Advisory
- https://access.redhat.com/errata/RHSA-2023:5476Advisory
- https://access.redhat.com/errata/RHSA-2024:0033Advisory
- https://access.redhat.com/security/cve/CVE-2023-4911Advisory
- https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txtAdvisory