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

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-20
Weakness: CWE-362

Description

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.

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

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