CVE-2026-23558grant table v2 race in status page mapping
Updated under an hour ago ()
Does this affect you?
It affects Xen. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-362
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- XEN
- NVD analysis
- Analyzed
- Record last updated
- May 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
References
- https://xenbits.xenproject.org/xsa/advisory-486.htmlmitigation, patch, vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/04/28/13mailing-list, mitigation, patch, third-party-advisory
- http://xenbits.xen.org/xsa/advisory-486.htmlmitigation, patch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.