CVE-2021-4159

Name	CVE-2021-4159
Description	A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, 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)	buster, buster (security)	4.19.249-2	vulnerable
	bullseye	5.10.140-1	fixed
	bullseye (security)	5.10.136-1	fixed
	bookworm	5.19.6-1	fixed
	sid	5.19.11-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
linux	source	(unstable)	5.7.6-1

Notes

[stretch] - linux <ignored> (Too risky to backport, and mitigated by default)
Fixed by: https://git.kernel.org/linus/294f2fc6da27620a506e6c050241655459ccd6bd (5.7-rc1)