Bug 2490337 (CVE-2026-42487) - CVE-2026-42487 xen: x86 HVM I/O port list traversal
Summary: CVE-2026-42487 xen: x86 HVM I/O port list traversal
Keywords:
Status: NEW
Alias: CVE-2026-42487
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: 2490537
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-18 15:01 UTC by OSIDB Bzimport
Modified: 2026-06-18 18:38 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-06-18 15:01:29 UTC 
HVM guest I/O port accesses are subject to either emulation or at least
translation.  Translations are managed by the device model (via
XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed
at any time.  Traversal of those lists (while handling guest I/O port
accesses) therefore needs synchronizing with updates, which was missing
so far.
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