{"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 Monné 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"}}]}}