CVE-2026-23558

Published: May 19, 2026Modified: Jun 17, 2026

7.8

Vector

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

Exploitability: 1.1 / Impact: 6.0

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

Affected (1)

Products: Xen: Xen

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Xen Xen	From 4.0.0

Related CWEs

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

References (3)

https://xenbits.xenproject.org/xsa/advisory-486.html

Source: security@xen.org

MitigationPatchVendor Advisory

http://www.openwall.com/lists/oss-security/2026/04/28/13

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing ListMitigationPatchThird Party Advisory

http://xenbits.xen.org/xsa/advisory-486.html

Source: af854a3a-2127-422b-91ae-364da2661108

MitigationPatchVendor Advisory

Timeline

No history available yet.