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CVE-2026-62428

grant-table: type confusion in grant-copy

Published: Jul 28, 2026Updated: Jul 28, 2026 Sources: CVE List NVDCWE-367
7.8HIGH
NVD MITRE
EPSS Score
0.1%
Top 99.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-367

Affected Products

Xen
oss-project·GBaka qemu, xapi
XenOn-prem
Cloud & SaaS / virtualization

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

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