155 lines
6.5 KiB
JSON
155 lines
6.5 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-79611",
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"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
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"state": "PUBLISHED",
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"assignerShortName": "XEN",
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"dateReserved": "2026-08-25T07:35:05.290Z",
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"datePublished": "2026-10-13T15:44:56.361Z",
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"dateUpdated": "2026-10-20T17:31:41.971Z"
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},
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"containers": {
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"cna": {
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"title": "VMX: VMentry failure with branch tracing and blocked states",
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"datePublic": "2026-10-13T12:00:00.000Z",
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"descriptions": [
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{
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"lang": "en",
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"value": "For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in. The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled. In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest."
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}
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],
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"impacts": [
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{
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"descriptions": [
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{
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"lang": "en",
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"value": "HVM/PVH guest userspace code may be able to crash the guest, resulting\nin a guest Denial of Service."
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}
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]
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}
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],
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"affected": [
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{
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"defaultStatus": "unknown",
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"product": "Xen",
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"vendor": "Xen",
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"versions": [
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{
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"status": "unknown",
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"version": "consult Xen advisory XSA-518"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"value": "All versions of Xen are affected.\n\nOnly systems supporting VMX hardware virtual extensions (Intel, VIA or\nZhaoxin CPUs) are affected. Arm as well as AMD and Hygon systems are\nunaffected.\n\nOnly HVM/PVH guests are affected. PV guests cannot leverage the\nvulnerability."
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}
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],
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"workarounds": [
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{
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"lang": "en",
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"value": "Running only PV guests will avoid this vulnerability.\n\nRunning HVM guests on only AMD or Hygon hardware will also avoid this\nvulnerability."
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "This issue was discovered by Claude Opus and diagnosed as a security issue\nby Teddy Astie of Vates."
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}
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],
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"references": [
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{
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"url": "https://xenbits.xenproject.org/xsa/advisory-518.html"
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}
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],
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"providerMetadata": {
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"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
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"shortName": "XEN",
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"dateUpdated": "2026-10-13T15:44:56.361Z"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "http://xenbits.xen.org/xsa/advisory-518.html"
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},
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{
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"url": "http://www.openwall.com/lists/oss-security/2026/10/13/7"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2026-10-13T16:13:51.786Z"
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}
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},
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{
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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"cweId": "CWE-843",
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"lang": "en",
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"description": "CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-10-20T17:31:36.841344Z",
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"id": "CVE-2026-79611",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-20T17:31:41.971Z"
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}
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}
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]
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}
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} |