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CVE-2023-4911

high CISA KEV

GNU C Library Buffer Overflow Vulnerability

Vendor / product: 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.

CVSS
7.8
7.8 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2023-10-03 18:15
Modified: 2026-10-14 22:17
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2023-11-21 · due 2023-12-12
Known ransomware use: Unknown

Required action (CISA)

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

Affected products

netapp / bootstrap_os all versions
siemens / simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware ≥3.1.5
siemens / simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware ≥3.1.5
siemens / siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware ≥3.1.5
siemens / simatic_s7-1500_tm_mfp_firmware <1.1
gnu / glibc ≥2.34 <2.39
fedoraproject / fedora 37, 38, 39
redhat / codeready_linux_builder 9.0
redhat / codeready_linux_builder_eus 8.6, 9.2, 9.4, 9.6
redhat / codeready_linux_builder_for_arm64 9.0_aarch64
redhat / codeready_linux_builder_for_arm64_eus 8.6, 9.2_aarch64, 9.4_aarch64, 9.6_aarch64
redhat / codeready_linux_builder_for_ibm_z_systems 9.0_s390x
redhat / codeready_linux_builder_for_ibm_z_systems_eus 8.6, 9.2_s390x, 9.4_s390x, 9.6_s390x
redhat / codeready_linux_builder_for_power_little_endian 9.0_ppc64le
redhat / codeready_linux_builder_for_power_little_endian_eus 8.6, 9.2_ppc64le, 9.4_ppc64le, 9.6_ppc64le
redhat / virtualization 4.0
redhat / virtualization_host 4.0
redhat / enterprise_linux 8.0, 9.0
redhat / enterprise_linux_eus 8.6, 9.2, 9.4, 9.6
redhat / enterprise_linux_for_arm_64 9.0_aarch64
redhat / enterprise_linux_for_arm_64_eus 8.6_aarch64, 9.2_aarch64, 9.4_aarch64, 9.6_aarch64
redhat / enterprise_linux_for_ibm_z_systems 9.0_s390x
redhat / enterprise_linux_for_ibm_z_systems_eus 9.2_s390x, 9.4_s390x, 9.6_s390x
redhat / enterprise_linux_for_ibm_z_systems_eus_s390x 8.6
redhat / enterprise_linux_for_power_big_endian_eus 8.6_ppc64le
redhat / enterprise_linux_for_power_little_endian 9.0_ppc64le
redhat / enterprise_linux_for_power_little_endian_eus 9.2_ppc64le, 9.4_ppc64le, 9.6_ppc64le
redhat / enterprise_linux_server_aus 8.6, 9.2, 9.4, 9.6
redhat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 9.2_ppc64le, 9.4_ppc64le, 9.6_ppc64le
redhat / enterprise_linux_server_tus 8.6
redhat / enterprise_linux_update_services_for_sap_solutions 9.2, 9.4, 9.6
canonical / ubuntu_linux 22.04, 23.04
debian / debian_linux 11.0, 12.0
netapp / h410c_firmware all versions
netapp / h300s_firmware all versions
netapp / h500s_firmware all versions
netapp / h700s_firmware all versions
netapp / h410s_firmware all versions
netapp / ontap_select_deploy_administration_utility all versions

Weakness classification (CWE)

CWE-122 CWE-787

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2238352
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2238352

References

Data sources

CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗

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