CVE-2026-102699

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102699", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2026-09-29T16:11:40.973Z", "datePublished": "2026-10-13T15:45:13.073Z", "dateUpdated": "2026-10-20T17:30:12.740Z"}, "containers": {"cna": {"title": "Arm: multiple issues with GNTTABOP_cache_flush", "datePublic": "2026-10-13T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\n1) XSA-437 (CVE-2023-34321) addressed issues with overflows in\n calculations involved in guests flushing caches through\n GNTTABOP_cache_flush. Unfortunately the fix there introduced a\n calculation which may underflow, resulting in a loop which would - at\n least on 64-bit Arm - take excessively long, and which would likely\n eventually crash the hypervisor.\n\n This is CVE-2026-102699.\n\n2) GNTTABOP_cache_flush may be issued on memory mapped from another\n domain using the grant table interface. However there was no\n restriction to disallow the use of invalidate-without-clean against\n read-only grant mappings, which may corrupt the granted memory.\n\n This is CVE-2026-102702."}], "impacts": [{"descriptions": [{"lang": "en", "value": "A malicious unprivileged guest may crash the hypervisor, causing a\nDenial of Service (DoS) affecting the entire host, or corrupt memory\nbelonging to another domain. Privilege escalation and information leaks\ncannot be ruled out."}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-519"}]}], "configurations": [{"lang": "en", "value": "All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and\nearlier are not vulnerable.\n\nOnly Arm systems are vulnerable. x86 systems are not vulnerable."}], "workarounds": [{"lang": "en", "value": "There is no known mitigation."}], "credits": [{"lang": "en", "type": "finder", "value": "CVE-2026-102699 was discovered by Leonid Komarianskyi of EPAM. It was\nlater independently reported by Ayan Kumar Halder of AMD.\n\nCVE-2026-102702 was found by the security team while looking at the\nsurrounding code."}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-519.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-10-13T15:45:13.073Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-191", "lang": "en", "description": "CWE-191 Integer Underflow (Wrap or Wraparound)"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-10-20T17:30:06.666789Z", "id": "CVE-2026-102699", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-10-20T17:30:12.740Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102699", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2026-09-29T16:11:40.973Z", "datePublished": "2026-10-13T15:45:13.073Z", "dateUpdated": "2026-10-20T17:30:12.740Z"}, "containers": {"cna": {"title": "Arm: multiple issues with GNTTABOP_cache_flush", "datePublic": "2026-10-13T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\n1) XSA-437 (CVE-2023-34321) addressed issues with overflows in\n calculations involved in guests flushing caches through\n GNTTABOP_cache_flush. Unfortunately the fix there introduced a\n calculation which may underflow, resulting in a loop which would - at\n least on 64-bit Arm - take excessively long, and which would likely\n eventually crash the hypervisor.\n\n This is CVE-2026-102699.\n\n2) GNTTABOP_cache_flush may be issued on memory mapped from another\n domain using the grant table interface. However there was no\n restriction to disallow the use of invalidate-without-clean against\n read-only grant mappings, which may corrupt the granted memory.\n\n This is CVE-2026-102702."}], "impacts": [{"descriptions": [{"lang": "en", "value": "A malicious unprivileged guest may crash the hypervisor, causing a\nDenial of Service (DoS) affecting the entire host, or corrupt memory\nbelonging to another domain. Privilege escalation and information leaks\ncannot be ruled out."}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-519"}]}], "configurations": [{"lang": "en", "value": "All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and\nearlier are not vulnerable.\n\nOnly Arm systems are vulnerable. x86 systems are not vulnerable."}], "workarounds": [{"lang": "en", "value": "There is no known mitigation."}], "credits": [{"lang": "en", "type": "finder", "value": "CVE-2026-102699 was discovered by Leonid Komarianskyi of EPAM. It was\nlater independently reported by Ayan Kumar Halder of AMD.\n\nCVE-2026-102702 was found by the security team while looking at the\nsurrounding code."}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-519.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-10-13T15:45:13.073Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-102699", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-20T17:30:06.666789Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-191", "description": "CWE-191 Integer Underflow (Wrap or Wraparound)"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-20T17:29:52.815Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-519"}]}], "source": "security@xen.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\n1) XSA-437 (CVE-2023-34321) addressed issues with overflows in\n calculations involved in guests flushing caches through\n GNTTABOP_cache_flush. Unfortunately the fix there introduced a\n calculation which may underflow, resulting in a loop which would - at\n least on 64-bit Arm - take excessively long, and which would likely\n eventually crash the hypervisor.\n\n This is CVE-2026-102699.\n\n2) GNTTABOP_cache_flush may be issued on memory mapped from another\n domain using the grant table interface. However there was no\n restriction to disallow the use of invalidate-without-clean against\n read-only grant mappings, which may corrupt the granted memory.\n\n This is CVE-2026-102702."}], "id": "CVE-2026-102699", "lastModified": "2026-10-20T18:17:15.180", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102699", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-20T17:30:06.666789Z", "version": "2.0.3"}}]}, "published": "2026-10-13T16:17:09.510", "references": [{"source": "security@xen.org", "url": "https://xenbits.xenproject.org/xsa/advisory-519.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-191"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "unknown", "versions": {"scheme": "generic", "value": "consult Xen advisory XSA-519"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Xen", "source": "cna", "vendor": "Xen"}, "product": "xen", "vendor": "xen"}], "created": "2026-10-13T18:15:16.480027+00:00", "updated": "2026-10-23T07:15:17.235318+00:00", "vendors": ["xen", "xen$PRODUCT$xen"]}