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CVE-2026-23558

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:aa5294fdd0091ab5698ae1080984d645e00209d5b10668de8df3d82902ca671e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unknown","product":"Xen","vendor":"Xen","versions":[{"status":"unknown","version":"consult Xen advisory XSA-486"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/adp/1/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-362","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/04/28/13"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/adp/0/references/0
{"url":"http://xenbits.xen.org/xsa/advisory-486.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/adp/0/references/1
{"url":"https://xenbits.xenproject.org/xsa/advisory-486.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8587c64ac2d2d8ece12cb7cf8600f38feb1f70f7d7162711059bafc3d0c80a4c · sha256:7fd85a916ff76846… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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