CVE-2026-42493x86 shadow paging is deprecated
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.
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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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- 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
- Deferred
- Record last updated
- Jul 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Xen Xen xen:xen (from the name) | consult Xen advisory XSA-495 status unknown | CNA record |
References
- https://xenbits.xenproject.org/xsa/advisory-495.html
- http://www.openwall.com/lists/oss-security/2026/07/28/12
- http://xenbits.xen.org/xsa/advisory-495.html
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.