CVE-2023-1076

Name	CVE-2023-1076
Description	A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3404-1

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)	5.10.237-1	fixed
	bookworm	6.1.148-1	fixed
	bookworm (security)	6.1.147-1	fixed
	trixie	6.12.43-1	fixed
	trixie (security)	6.12.41-1	fixed
	forky	6.16.3-1	fixed
	sid	6.16.7-1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	bullseye	5.10.178-1
linux	source	(unstable)	6.1.20-1
linux-5.10	source	buster	5.10.178-3~deb10u1	DLA-3404-1

Notes

https://git.kernel.org/linus/66b2c338adce580dfce2199591e65e2bab889cff
https://git.kernel.org/linus/a096ccca6e503a5c575717ff8a36ace27510ab0a
https://www.openwall.com/lists/oss-security/2023/03/01/5