{"action":"Upgrade xen to 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5 or later.","affected":[{"fixed":"4.8.3+comet2+shim4.10.0+comet3-1+deb9u5","introduced":"0"}],"component":"xen","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["4.8.3+comet2+shim4.10.0+comet3-1+deb9u5"],"id":"tcs_01M5NC9PXX08GSTJWCS7REM35X","modified_at":"2026-09-01T20:03:45.839697100Z","published_at":"2017-12-12T23:29:00.300Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2017-17563","https://security-tracker.debian.org/tracker/CVE-2017-17563"],"severity":{"label":"high","score":7.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2017-17563","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2017-17563"}],"summary":"An issue was discovered in Xen through 4.9.x allowing guest OS users to cause a denial of service (host OS crash) or gain host OS privileges by leveraging an incorrect mask for reference-count overflo"}