CVE-2026-62428 | BDVDB-2026-353321 Detail
XenXen
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.
Impact#
An unprivileged guest may be able to elevate its privileges to that of the host. Information leaks and Denial of Service (DoS) are possible as well.
Weaknesses#
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
References#
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.