High 8.8Published Oct 13, 2026

CVE-2026-79610grant-table: double version change race

Updated under an hour ago (Oct 27, 2026, 5:23 PM ET)

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It affects Xen. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.11%, higher than 1% of scored CVEs.

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Exploited in the last 30 days

XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.11% (percentile 1)
Assigned by: XEN
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

Xen Xen xen:xen (from the name)	consult Xen advisory XSA-517 status unknown	CNA record

References

References

https://xenbits.xenproject.org/xsa/advisory-517.html
http://www.openwall.com/lists/oss-security/2026/10/13/6
http://xenbits.xen.org/xsa/advisory-517.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.