CVE-2023-32251

Name	CVE-2023-32251
Description	A vulnerability has been identified in the Linux kernel's ksmbd component (kernel SMB/CIFS server). A security control designed to prevent dictionary attacks, which introduces a 5-second delay during session setup, can be bypassed through the use of asynchronous requests. This bypass negates the intended anti-brute-force protection, potentially allowing attackers to conduct dictionary attacks more efficiently against user credentials or other authentication mechanisms.
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
linux (PTS)	bullseye	5.10.223-1	vulnerable
	bullseye (security)	5.10.237-1	vulnerable
	bookworm	6.1.137-1	fixed
	bookworm (security)	6.1.140-1	fixed
	trixie, sid	6.12.38-1	fixed
	trixie (security)	6.12.31-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
linux	source	bookworm	6.1.37-1
linux	source	(unstable)	6.3.7-1

https://git.kernel.org/linus/b096d97f47326b1e2dbdef1c91fab69ffda54d17 (6.4-rc1)
https://www.zerodayinitiative.com/advisories/ZDI-23-699/