Bug 2508013 (CVE-2026-42493) - CVE-2026-42493 xen: Xen: Denial of Service due to prolonged x86 shadow paging operations
Summary: CVE-2026-42493 xen: Xen: Denial of Service due to prolonged x86 shadow paging...
Keywords:
Status: NEW
Alias: CVE-2026-42493
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-28 14:02 UTC by OSIDB Bzimport
Modified: 2026-08-24 11:54 UTC (History)
0 users

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Description OSIDB Bzimport 2026-07-28 14:02:02 UTC 
Addressing certain issues, in particular related to operations which may
take excessively long and therefore would need preemption, has turned out
overly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly
available, the decision was to deprecate the functionality, while still
retaining it for people to use at their own (security) risk.  Memory-wise
small enough guests may still be okay to run.
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