Vulnerability · Published Jul 28, 2026 · Assigned by XEN
CVE-2026-62428grant-table: type confusion in grant-copy
High 7.8
In plain English
A high-severity security flaw in Xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | xen | 4.19.6-r0 | ALPINE-CVE-2026-62428 |
| Alpine:v3.22 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62428 |
| Alpine:v3.23 | xen | 4.20.4-r0 | ALPINE-CVE-2026-62428 |
| Alpine:v3.24 | xen | 4.21.2-r0 | ALPINE-CVE-2026-62428 |
| Debian:12 | xen | 4.17.7-0+deb12u1 | DEBIAN-CVE-2026-62428 |
| Debian:13 | xen | 4.20.3+127-gc42374a105-0+deb13u1 | DEBIAN-CVE-2026-62428 |
| Debian:14 | xen | 4.20.3+127-gc42374a105-1 | DEBIAN-CVE-2026-62428 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62428 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62428 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2026-62428 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2026-62428 |
Affected products (as reported)
Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H