CVE-2026-62435: grant-table: version change racing with other operations
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]
With the introduction of Grant Table v2 came the requirement to be able to switch between versions. Switching from v1 to v2 reduces the number of valid grant references, as a bigger shared entry structure is then needed while the shared table doesn't change size. Switching from v2 back to v1 the status frames, which are separate in v2, go away.
Code holding, but intermediately dropping and then re-acquiring the grant table lock, sometimes wrongly assumes that said properties wouldn't change across the window in time where the lock is not being held.
The v1 -> v2 issue is CVE-2026-62435.
The v2 -> v1 issue is CVE-2026-62436.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62435?
The severity of CVE-2026-62435 is rated as medium with a score of 6.5 according to CVSS 3.1.
What are the potential impacts of CVE-2026-62435?
CVE-2026-62435 can lead to race conditions affecting the grant-table operations in the Xen Project.
What software is affected by CVE-2026-62435?
CVE-2026-62435 affects the Xen Project software, specifically related to the grant-table functionality.
How do I fix CVE-2026-62435?
To mitigate CVE-2026-62435, users should apply the latest security patches provided by the Xen Project.
When was CVE-2026-62435 published?
CVE-2026-62435 was published on July 28, 2026.