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Vulnerability record · CVE-2026-62428 · published 28 July 2026

CVE-2026-62428: TOCTOU race condition vulnerability

When grant-copy operations are processed, the respective grant may or may not already be in use by another operation (a mapping or another copy). For all copy operations the referenced guest frame is looked up. When another operation is already active for the grant (the grant is "pinned"), what is being supplied back to actually carry out permission checks and copy operation may not be consistent: The permission check may be carried out on a page different from the one involved in the copy.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.4% CWE-367 · TOCTOU race condition Deferred
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
28 Jul 2026Last modified by NVD

Description

When grant-copy operations are processed, the respective grant may or may not already be in use by another operation (a mapping or another copy). For all copy operations the referenced guest frame is looked up. When another operation is already active for the grant (the grant is "pinned"), what is being supplied back to actually carry out permission checks and copy operation may not be consistent: The permission check may be carried out on a page different from the one involved in the copy.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://xenbits.xenproject.org/xsa/advisory-500.html
http://www.openwall.com/lists/oss-security/2026/07/28/16
http://xenbits.xen.org/xsa/advisory-500.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-62428), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.