CVE-2026-79610

UNKNOWN 0.0

grant-table: double version change race

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	xen
Product	xen
Published	Oct 13, 2026
Last Updated	Oct 13, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

This issue was discovered by Claude Opus and diagnosed as a security issue by Teddy Astie of Vates.