CVE-2023-4806

Name	CVE-2023-4806
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
glibc (PTS)	buster	2.28-10+deb10u1	vulnerable
	buster (security)	2.28-10+deb10u2	vulnerable
	bullseye	2.31-13+deb11u8	vulnerable
	bullseye (security)	2.31-13+deb11u9	vulnerable
	bookworm	2.36-9+deb12u4	fixed
	bookworm (security)	2.36-9+deb12u6	fixed
	trixie, sid	2.37-18	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
glibc	source	bookworm	2.36-9+deb12u3
glibc	source	(unstable)	2.37-10

Notes

[bullseye] - glibc <no-dsa> (Minor issue)
[buster] - glibc <no-dsa> (Minor issue)
https://sourceware.org/bugzilla/show_bug.cgi?id=30843
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=973fe93a5675c42798b2161c6f29c01b0e243994
When fixing this issue in older releases make sure to not open CVE-2023-5156.
https://sourceware.org/cgit/glibc/tree/advisories/GLIBC-SA-2023-0003