CVE-2020-15852

Name	CVE-2020-15852
Description	An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	stretch	4.9.228-1	fixed
	stretch (security)	4.9.303-1	fixed
	buster	4.19.235-1	fixed
	buster (security)	4.19.232-1	fixed
	bullseye	5.10.106-1	fixed
	bullseye (security)	5.10.113-1	fixed
	bookworm	5.17.3-1	fixed
	sid	5.17.6-1	fixed

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

Package	Type	Release	Fixed Version
linux	source	stretch	(not affected)
linux	source	buster	(not affected)
linux	source	(unstable)	5.7.10-1

Notes

[buster] - linux <not-affected> (Only affects 5.5 and later)
[stretch] - linux <not-affected> (Only affects 5.5 and later)
https://www.openwall.com/lists/oss-security/2020/07/16/1