CVE-2025-27465 (GCVE-0-2025-27465)
Vulnerability from cvelistv5
Published
2025-07-16 09:08
Modified
2025-07-17 15:00
Severity ?
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Summary
Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.
References
Impacted products
Vendor Product Version
Xen Xen Create a notification for this product.
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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
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                "timestamp": "2025-07-16T20:46:06.289437Z",
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        }
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          "url": "https://xenbits.xenproject.org/xsa/advisory-470.html"
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      "title": "x86: Incorrect stubs exception handling for flags recovery",
      "workarounds": [
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          "value": "There are no mitigations."
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    "dateReserved": "2025-02-26T09:16:54.461Z",
    "dateUpdated": "2025-07-17T15:00:57.741Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-27465\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-07-16T20:46:06.289437Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-755\", \"description\": \"CWE-755 Improper Handling of Exceptional Conditions\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-07-16T20:46:28.330Z\"}}], \"cna\": {\"title\": \"x86: Incorrect stubs exception handling for flags recovery\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Andrew Cooper of XenServer.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"An unprivileged guest can cause a hypervisor crash, causing a Denial of\\nService (DoS) of the entire host.\"}]}], \"affected\": [{\"vendor\": \"Xen\", \"product\": \"Xen\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-470\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2025-07-01T11:56:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-470.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no mitigations.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Certain instructions need intercepting and emulating by Xen.  In some\\ncases Xen emulates the instruction by replaying it, using an executable\\nstub.  Some instructions may raise an exception, which is supposed to be\\nhandled gracefully.  Certain replayed instructions have additional logic\\nto set up and recover the changes to the arithmetic flags.\\n\\nFor replayed instructions where the flags recovery logic is used, the\\nmetadata for exception handling was incorrect, preventing Xen from\\nhandling the the exception gracefully, treating it as fatal instead.\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"Xen 4.9 and onwards are vulnerable.  Xen 4.8 and older are not\\nvulnerable.\\n\\nOnly x86 systems are vulnerable.  ARM systems are not vulnerable.\\n\\nOnly HVM or PVH guests can leverage the vulnerability.  PV guests cannot\\nleverage the vulnerability.\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2025-07-16T09:08:39.931Z\"}}}",
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}


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