CriticalFix available
xen — security advisory
The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see: http://xenbits.xen.org/xsa/advisory-433.html
- Products
- xen
- Affected versions
- 4.17.1+2-gb773c48e36-1, 4.17.2+55-g0b56bed864-1, 4.17.2+76-ge1f9cb16e2-1, 4.17.2+76-ge1f9cb16e2-1~deb12u1, 4.17.2-1, 4.17.3+10-g091466ba55-1, 4.17.3+10-g091466ba55-1.1, 4.17.3+10-g091466ba55-1.1~exp1, 4.17.3+10-g091466ba55-1.1~exp2, 4.17.3+10-g091466ba55-1~deb12u1, 4.17.3+36-g54dacb5c02-1, 4.17.5+23-ga4e5191dc0-1, 4.17.5+23-ga4e5191dc0-1+deb12u1, 4.17.5+72-g01140da4e8-1, 4.17.7-0+deb12u1, 4.19.0+14-g0918434e0f-1~exp1, 4.19.1-1, 4.19.1-1~exp1, 4.19.1-1~exp4, 4.20.0+68-g35cb38b222-1, 4.20.0-1, 4.20.0~rc2+1-gfcde5e0de8-1~exp1, 4.20.2+37-g61ff35323e-0+deb13u1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-0+deb13u1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-2, 4.20.3+127-gc42374a105-0+deb13u1, 4.20.3+127-gc42374a105-1, 4.20.4+39-gf1e1321c87-1
- Fixed versions
- 4.20.4+39-gf1e1321c87-0+deb13u1, 4.20.4+39-gf1e1321c87-1
- CVEs
- CVE-2026-79608
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 02:20 UTC · Revision 1
Source evidence
The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see: http://xenbits.xen.org/xsa/advisory-433.html
osv:DEBIAN-CVE-2026-79608
xen
Fixed versions: Not specified
xen
Fixed versions: 4.20.4+39-gf1e1321c87-0+deb13u1
xen
Fixed versions: 4.20.4+39-gf1e1321c87-1
Complete source record
{
"id": "4b8da46a32941134e5b076803adb821165a76174a85a980bfe44124c4e08a5e9",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-79608",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-79608",
"summary": "The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see: http://xenbits.xen.org/xsa/advisory-433.html",
"evidence": "osv:DEBIAN-CVE-2026-79608",
"products": [
{
"name": {
"value": "xen",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.17.1+2-gb773c48e36-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.2+55-g0b56bed864-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.2+76-ge1f9cb16e2-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.2+76-ge1f9cb16e2-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+10-g091466ba55-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+10-g091466ba55-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+10-g091466ba55-1.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+10-g091466ba55-1.1~exp2",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+10-g091466ba55-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.3+36-g54dacb5c02-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.5+23-ga4e5191dc0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.5+23-ga4e5191dc0-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.5+72-g01140da4e8-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.17.7-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.19.0+14-g0918434e0f-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "4.19.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.19.1-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "4.19.1-1~exp4",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.0+68-g35cb38b222-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.0~rc2+1-gfcde5e0de8-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.2+37-g61ff35323e-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.2+7-g1badcf5035-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.2+7-g1badcf5035-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.3+127-gc42374a105-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.20.4+39-gf1e1321c87-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.20.4+39-gf1e1321c87-0+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "4.20.0+68-g35cb38b222-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.2+37-g61ff35323e-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.2+37-g61ff35323e-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.2+7-g1badcf5035-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.2+7-g1badcf5035-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.2+7-g1badcf5035-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.3+127-gc42374a105-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "4.20.3+127-gc42374a105-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "xen",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.20.4+39-gf1e1321c87-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.20.0+68-g35cb38b222-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.20.2+37-g61ff35323e-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.20.2+7-g1badcf5035-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.20.2+7-g1badcf5035-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.20.3+127-gc42374a105-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-79608",
"aliases": [
"DEBIAN-CVE-2026-79608"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/debian/xen?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.17.1+2-gb773c48e36-1",
"4.17.2+55-g0b56bed864-1",
"4.17.2+76-ge1f9cb16e2-1",
"4.17.2+76-ge1f9cb16e2-1~deb12u1",
"4.17.2-1",
"4.17.3+10-g091466ba55-1",
"4.17.3+10-g091466ba55-1.1",
"4.17.3+10-g091466ba55-1.1~exp1",
"4.17.3+10-g091466ba55-1.1~exp2",
"4.17.3+10-g091466ba55-1~deb12u1",
"4.17.3+36-g54dacb5c02-1",
"4.17.5+23-ga4e5191dc0-1",
"4.17.5+23-ga4e5191dc0-1+deb12u1",
"4.17.5+72-g01140da4e8-1",
"4.17.7-0+deb12u1",
"4.19.0+14-g0918434e0f-1~exp1",
"4.19.1-1",
"4.19.1-1~exp1",
"4.19.1-1~exp4",
"4.20.0+68-g35cb38b222-1",
"4.20.0-1",
"4.20.0~rc2+1-gfcde5e0de8-1~exp1",
"4.20.2+37-g61ff35323e-1",
"4.20.2+7-g1badcf5035-1",
"4.20.2+7-g1badcf5035-2",
"4.20.3+127-gc42374a105-1",
"4.20.4+39-gf1e1321c87-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-79608.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.20.4+39-gf1e1321c87-0+deb13u1"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/debian/xen?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.20.0+68-g35cb38b222-1",
"4.20.2+37-g61ff35323e-0+deb13u1",
"4.20.2+37-g61ff35323e-1",
"4.20.2+7-g1badcf5035-0+deb13u1",
"4.20.2+7-g1badcf5035-1",
"4.20.2+7-g1badcf5035-2",
"4.20.3+127-gc42374a105-0+deb13u1",
"4.20.3+127-gc42374a105-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-79608.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.20.4+39-gf1e1321c87-1"
}
]
}
],
"package": {
"name": "xen",
"purl": "pkg:deb/debian/xen?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.20.0+68-g35cb38b222-1",
"4.20.2+37-g61ff35323e-1",
"4.20.2+7-g1badcf5035-1",
"4.20.2+7-g1badcf5035-2",
"4.20.3+127-gc42374a105-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-79608.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:05:44.804109097Z",
"provider": "osv",
"upstream": [
"CVE-2026-79608"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-79608"
]
},
"related_cves": [
{
"value": "CVE-2026-79608",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 424556,
"published_at": "2026-10-13T16:17:23.04+00:00"
}