CVE-2026-79610

Name	CVE-2026-79610
Description	XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.
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)
References	DSA-6571-1

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	vulnerable
	bookworm (security)	4.17.7-0+deb12u1	vulnerable
	trixie	4.20.3+127-gc42374a105-0+deb13u1	vulnerable
	trixie (security)	4.20.4+39-gf1e1321c87-0+deb13u1	fixed
	forky	4.20.3+127-gc42374a105-1	vulnerable
	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	trixie	4.20.4+39-gf1e1321c87-0+deb13u1		DSA-6571-1
xen	source	(unstable)	4.20.4+39-gf1e1321c87-1

https://xenbits.xen.org/xsa/advisory-517.html