What is CVE-2026-62428?

CVE-2026-62428 is a high-severity vulnerability in Xen, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2026-07-28.

How severe is CVE-2026-62428?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Xen

CVE-2026-62428

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 a…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Xen — versions consult Xen advisory XSA-500

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

security@xen.org
af854a3a-2127-422b-91ae-364da2661108
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-62428?: CVE-2026-62428 is a high-severity vulnerability in Xen, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2026-07-28.
How severe is CVE-2026-62428?: High severity. CVSS v3 base score is 7.8 out of 10.