CVE-2026-79607

Name	CVE-2026-79607
Description	During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing. This results in an inconsistent state when reading the state back in the new Xenstore, causing a crash of Xenstore or wrong Xenstore data.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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
xen (PTS)	bookworm	4.17.5+72-g01140da4e8-1	fixed
	bookworm (security)	4.17.7-0+deb12u1	fixed
	trixie	4.20.3+127-gc42374a105-0+deb13u1	fixed
	trixie (security)	4.20.4+39-gf1e1321c87-0+deb13u1	fixed
	forky, sid	4.20.4+39-gf1e1321c87-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
xen	source	(unstable)	(not affected)

- xen <not-affected> (Only affects Xen 4.22)
https://xenbits.xen.org/xsa/advisory-514.html