UpHeron
All vulnerabilities

Servers and applications

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.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 21 Nov 2023.

Severity
High 7.8
Published
3 Oct 2023
Last changed
14 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.39
Sources
NVD

Affected software

SoftwareAffected versions
GNU C LibraryServers and applications · cpe:a:gnu:glibc
  • From 2.34 before 2.39

Known exploited

CISA name
GNU C Library Buffer Overflow Vulnerability
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Due for US agencies
12 Dec 2023
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2023-4911
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2023-4911