Bug 2479868 (CVE-2026-23558) - CVE-2026-23558 xen: Xen: Privilege escalation or denial of service due to race condition in grant table version change
Summary: CVE-2026-23558 xen: Xen: Privilege escalation or denial of service due to rac...
Keywords:
Status: NEW
Alias: CVE-2026-23558
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2483743
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-19 14:03 UTC by OSIDB Bzimport
Modified: 2026-06-09 08:55 UTC (History)
0 users

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Description OSIDB Bzimport 2026-05-19 14:03:18 UTC 
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.
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