CVE-2025-27466 (GCVE-0-2025-27466)
Vulnerability from cvelistv5
Published
2025-09-11 14:05
Modified
2025-09-11 14:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
There are multiple issues related to the handling and accessing of guest
memory pages in the viridian code:
1. A NULL pointer dereference in the updating of the reference TSC area.
This is CVE-2025-27466.
2. A NULL pointer dereference by assuming the SIM page is mapped when
a synthetic timer message has to be delivered. This is
CVE-2025-58142.
3. A race in the mapping of the reference TSC page, where a guest can
get Xen to free a page while still present in the guest physical to
machine (p2m) page tables. This is CVE-2025-58143.
References
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Xen versions 4.12 and older\nare not vulnerable.\n\nOnly x86 HVM guests which have the reference_tsc or stimer viridian\nextensions enabled are vulnerable." } ], "credits": [ { "lang": "en", "type": "finder", "value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer." } ], "datePublic": "2025-09-09T11:53:00.000Z", "descriptions": [ { "lang": "en", "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThere are multiple issues related to the handling and accessing of guest\nmemory pages in the viridian code:\n\n 1. A NULL pointer dereference in the updating of the reference TSC area.\n This is CVE-2025-27466.\n\n 2. A NULL pointer dereference by assuming the SIM page is mapped when\n a synthetic timer message has to be delivered. This is\n CVE-2025-58142.\n\n 3. A race in the mapping of the reference TSC page, where a guest can\n get Xen to free a page while still present in the guest physical to\n machine (p2m) page tables. This is CVE-2025-58143." } ], "impacts": [ { "descriptions": [ { "lang": "en", "value": "Denial of Service (DoS) affecting the entire host, information leaks, or\nelevation of privilege." } ] } ], "providerMetadata": { "dateUpdated": "2025-09-11T14:05:29.525Z", "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN" }, "references": [ { "url": "https://xenbits.xenproject.org/xsa/advisory-472.html" } ], "title": "Mutiple vulnerabilities in the Viridian interface", "workarounds": [ { "lang": "en", "value": "Not enabling the reference_tsc and stimer viridian extensions will avoid\nthe issues." } ] } }, "cveMetadata": { "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "assignerShortName": "XEN", "cveId": "CVE-2025-27466", "datePublished": "2025-09-11T14:05:29.525Z", "dateReserved": "2025-02-26T09:16:54.462Z", "dateUpdated": "2025-09-11T14:40:33.401Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "vulnerability-lookup:meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2025-27466\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2025-09-11T14:15:41.413\",\"lastModified\":\"2025-09-11T17:14:10.147\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"[This CNA information record relates to multiple CVEs; the\\ntext explains which aspects/vulnerabilities correspond to which CVE.]\\n\\nThere are multiple issues related to the handling and accessing of guest\\nmemory pages in the viridian code:\\n\\n 1. A NULL pointer dereference in the updating of the reference TSC area.\\n This is CVE-2025-27466.\\n\\n 2. A NULL pointer dereference by assuming the SIM page is mapped when\\n a synthetic timer message has to be delivered. This is\\n CVE-2025-58142.\\n\\n 3. A race in the mapping of the reference TSC page, where a guest can\\n get Xen to free a page while still present in the guest physical to\\n machine (p2m) page tables. This is CVE-2025-58143.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-395\"}]}],\"references\":[{\"url\":\"https://xenbits.xenproject.org/xsa/advisory-472.html\",\"source\":\"security@xen.org\"}]}}", "vulnrichment": { "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 9.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-27466\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-09-11T14:25:53.637084Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-395\", \"description\": \"CWE-395 Use of NullPointerException Catch to Detect NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-09-11T14:26:20.300Z\"}}], \"cna\": {\"title\": \"Mutiple vulnerabilities in the Viridian interface\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Roger Pau Monn\\u00e9 of XenServer.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"Denial of Service (DoS) affecting the entire host, information leaks, or\\nelevation of privilege.\"}]}], \"affected\": [{\"vendor\": \"Xen\", \"product\": \"Xen\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-472\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2025-09-09T11:53:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-472.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Not enabling the reference_tsc and stimer viridian extensions will avoid\\nthe issues.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"[This CNA information record relates to multiple CVEs; the\\ntext explains which aspects/vulnerabilities correspond to which CVE.]\\n\\nThere are multiple issues related to the handling and accessing of guest\\nmemory pages in the viridian code:\\n\\n 1. A NULL pointer dereference in the updating of the reference TSC area.\\n This is CVE-2025-27466.\\n\\n 2. A NULL pointer dereference by assuming the SIM page is mapped when\\n a synthetic timer message has to be delivered. This is\\n CVE-2025-58142.\\n\\n 3. A race in the mapping of the reference TSC page, where a guest can\\n get Xen to free a page while still present in the guest physical to\\n machine (p2m) page tables. This is CVE-2025-58143.\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"Xen versions 4.13 and newer are vulnerable. Xen versions 4.12 and older\\nare not vulnerable.\\n\\nOnly x86 HVM guests which have the reference_tsc or stimer viridian\\nextensions enabled are vulnerable.\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2025-09-11T14:05:29.525Z\"}}}", "cveMetadata": "{\"cveId\": \"CVE-2025-27466\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-09-11T14:40:33.401Z\", \"dateReserved\": \"2025-02-26T09:16:54.462Z\", \"assignerOrgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"datePublished\": \"2025-09-11T14:05:29.525Z\", \"assignerShortName\": \"XEN\"}", "dataType": "CVE_RECORD", "dataVersion": "5.1" } } }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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