CVE-2023-46813

Name	CVE-2023-46813
Description	An issue was discovered in the Linux kernel before 6.5.9, exploitable by local users with userspace access to MMIO registers. Incorrect access checking in the #VC handler and instruction emulation of the SEV-ES emulation of MMIO accesses could lead to arbitrary write access to kernel memory (and thus privilege escalation). This depends on a race condition through which userspace can replace an instruction before the #VC handler reads it.
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)	buster	4.19.249-2	vulnerable
	buster (security)	4.19.289-2	vulnerable
	bullseye	5.10.197-1	vulnerable
	bullseye (security)	5.10.191-1	vulnerable
	bookworm	6.1.55-1	vulnerable
	bookworm (security)	6.1.52-1	vulnerable
	sid, trixie	6.5.10-1	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)	6.5.10-1

Notes

https://git.kernel.org/linus/63e44bc52047f182601e7817da969a105aa1f721 (6.6-rc7)
https://git.kernel.org/linus/b9cb9c45583b911e0db71d09caa6b56469eb2bdf (6.6-rc7)
https://git.kernel.org/linus/a37cd2a59d0cb270b1bba568fd3a3b8668b9d3ba (6.6-rc7)