CVE-2023-4806 Information

Description

A flaw was found 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.

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=2237782 https://access.redhat.com/security/cve/CVE-2023-4806