{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-79603", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2026-08-25T07:35:05.289Z", "datePublished": "2026-09-08T12:11:21.789Z", "dateUpdated": "2026-09-08T17:08:33.807Z"}, "containers": {"cna": {"title": "Unconditionally do TLB flushing ahead of page scrubbing", "datePublic": "2026-09-08T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "x86 PV guests can free memory pages while still keeping a stale TLB entry\npointing to them. A TLB flush is only issued by Xen (if needed) when the\npage is re-used. Since it's possible for the page to be scrubbed ahead of\nthe TLB flush, there's a window where a PV guest can modify an already\nscrubbed page."}], "impacts": [{"descriptions": [{"lang": "en", "value": "Deployments using `xsm=silo scrub-domheap` with the aim of not allowing the\nexchange of information amongst guests are not effective in the presence of\nPV guests."}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-511"}]}], "configurations": [{"lang": "en", "value": "All Xen versions from 4.13 onwards are vulnerable. Xen versions 4.12 and\nearlier are not vulnerable as they lack the `scrub-domheap` command line\noption.\n\nOnly x86 PV guests can exploit the vulnerability."}], "workarounds": [{"lang": "en", "value": "There is no known mitigation."}], "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered by Roger Pau Monn\u00e9 of AMD."}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-511.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-09-08T12:11:21.789Z"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://xenbits.xen.org/xsa/advisory-511.html"}, {"url": "http://www.openwall.com/lists/oss-security/2026/09/08/8"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-08T17:08:33.807Z"}}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-664", "lang": "en", "description": "CWE-664 Improper Control of a Resource Through its Lifetime"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T13:42:37.092287Z", "id": "CVE-2026-79603", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T13:42:41.424Z"}}]}}

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