CVE-2023-4806

MEDIUM

MEDIUM Priority: 0.09 BB Relevance: 62/100

Published: 2023-09-18 Modified: 2026-11-07 First seen: 2026-11-07 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

AV: Network

AC: High

PR: None

UI: None

S: Unchanged

C: None

I: None

A: High

Description

A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.

Weakness Classification (1)

CWE-416 — Use After Free

Affected Software (29)

Vendor	Product	Version
fedoraproject	fedora	37
fedoraproject	fedora	38
fedoraproject	fedora	39
gnu	glibc	2.33
redhat	codeready_linux_builder_eus	9.2
redhat	codeready_linux_builder_eus_for_power_little_endian	9.0_ppc64le
redhat	codeready_linux_builder_eus_for_power_little_endian_eus	9.2_ppc64le
redhat	codeready_linux_builder_for_arm64	9.0_aarch64
redhat	codeready_linux_builder_for_arm64_eus	9.2_aarch64
redhat	codeready_linux_builder_for_ibm_z_systems	9.0_s390x
redhat	codeready_linux_builder_for_ibm_z_systems_eus	9.2_s390x
redhat	enterprise_linux	7.0
redhat	enterprise_linux	8.0
redhat	enterprise_linux	9.0
redhat	enterprise_linux_eus	8.8
redhat	enterprise_linux_eus	9.2
redhat	enterprise_linux_for_arm_64	9.0_aarch64
redhat	enterprise_linux_for_arm_64_eus	9.2_aarch64
redhat	enterprise_linux_for_ibm_z_systems	8.0_s390x
redhat	enterprise_linux_for_ibm_z_systems_eus	8.8_s390x
redhat	enterprise_linux_for_ibm_z_systems_eus_s390x	9.2
redhat	enterprise_linux_for_ibm_z_systems_s390x	9.2
redhat	enterprise_linux_for_power_little_endian	8.0_ppc64le
redhat	enterprise_linux_for_power_little_endian	9.2_ppc64le
redhat	enterprise_linux_for_power_little_endian_eus	8.8_ppc64le
redhat	enterprise_linux_for_power_little_endian_eus	9.2_ppc64le
redhat	enterprise_linux_server_aus	9.2
redhat	enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions	9.2_ppc64le
redhat	enterprise_linux_tus	8.8