CVE-2026-62436: 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-2026-62436?
CVE-2026-62436 has a risk score of 44, indicating significant vulnerability.
How do I mitigate CVE-2026-62436?
To mitigate CVE-2026-62436, update to the latest version of the Linux grant-table software.
What systems are affected by CVE-2026-62436?
CVE-2026-62436 affects systems utilizing the Linux grant-table, specifically those implementing version changes between Grant Table v1 and v2.
What kind of exploitation is possible with CVE-2026-62436?
CVE-2026-62436 could potentially allow attackers to manipulate grant references during the version switching process.
When was CVE-2026-62436 published?
CVE-2026-62436 was published on July 28, 2026.