CVE-2023-3776

Name	CVE-2023-3776
Description	A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
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-3623-1, DLA-3710-1, DSA-5480-1, DSA-5492-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	buster	4.19.249-2	vulnerable
	buster (security)	4.19.304-1	fixed
	bullseye	5.10.209-2	fixed
	bullseye (security)	5.10.205-2	fixed
	bookworm	6.1.76-1	fixed
	bookworm (security)	6.1.85-1	fixed
	sid, trixie	6.7.12-1	fixed
linux-5.10 (PTS)	buster (security)	5.10.209-2~deb10u1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	buster	4.19.304-1	DLA-3710-1
linux	source	bullseye	5.10.191-1	DSA-5480-1
linux	source	bookworm	6.1.52-1	DSA-5492-1
linux	source	(unstable)	6.4.4-2
linux-5.10	source	buster	5.10.197-1~deb10u1	DLA-3623-1

https://git.kernel.org/linus/0323bce598eea038714f941ce2b22541c46d488f (6.5-rc2)