CVE-2026-23558
grant table v2 race in status page mapping
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.
INFO
Published Date :
May 19, 2026, 2:16 p.m.
Last Modified :
May 19, 2026, 2:48 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-23558
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Xen to the latest version to include security fixes.
- Apply security patches addressing XSA-379 and XSA-387.
- Review and test grant table handling in Xen virtualized environments.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-23558.
| URL | Resource |
|---|---|
| https://xenbits.xenproject.org/xsa/advisory-486.html | |
| http://www.openwall.com/lists/oss-security/2026/04/28/13 | |
| http://xenbits.xen.org/xsa/advisory-486.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23558 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23558
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-23558 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23558 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value Added 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. Added Reference https://xenbits.xenproject.org/xsa/advisory-486.html -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 19, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/28/13 Added Reference http://xenbits.xen.org/xsa/advisory-486.html