What is GHSA-4qf9-g5cf-cx9j?

GHSA-4qf9-g5cf-cx9j is a security advisory published by GitHub Security Advisories with High severity. The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race...

Which CVE IDs does GHSA-4qf9-g5cf-cx9j cover?

GHSA-4qf9-g5cf-cx9j covers the following CVE IDs: CVE-2026-23558. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-4qf9-g5cf-cx9j?

GHSA-4qf9-g5cf-cx9j has a CVSS v3 base score of 7.8, published by GitHub Security Advisories.

GHSA-4qf9-g5cf-cx9jHighCVSS 7.8

The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race...

Vendor

GitHub Security Advisories

Published

May 19, 2026

Last Modified

May 19, 2026

🔗 CVE IDs covered (1)

CVE-2026-23558 →

📋 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.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-23558
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
https://github.com/advisories/GHSA-4qf9-g5cf-cx9j