CVE-2021-3178

Name	CVE-2021-3178
Description	fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2586-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	fixed
	bullseye (security)	5.10.226-1	fixed
	bookworm	6.1.123-1	fixed
	bookworm (security)	6.1.119-1	fixed
	trixie	6.12.10-1	fixed
	sid	6.12.11-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
linux	source	stretch	4.9.258-1		DLA-2586-1
linux	source	buster	4.19.171-1
linux	source	(unstable)	5.10.12-1	unimportant

https://patchwork.kernel.org/project/linux-nfs/patch/20210111210129.GA11652@fieldses.org/
Disputed/mild security relevance/impact