{"action":"Upgrade xen to 4.20.3+127-gc42374a105-0+deb13u1 or later.","affected":[{"fixed":"4.20.3+127-gc42374a105-0+deb13u1","introduced":"0"}],"component":"xen","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["4.20.3+127-gc42374a105-0+deb13u1"],"id":"tcs_01M5NR3XMNW8MHV89S84QS4PHM","modified_at":"2026-10-15T09:47:40.701504705Z","published_at":"2026-05-19T14:16:38.960Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-23558","https://security-tracker.debian.org/tracker/CVE-2026-23558"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-23558#Debian:13/xen","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-23558"}],"summary":"The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mappi"}