Vulnerability details
CVE-2026-42493
Xen Xen
x86 shadow paging is deprecated
CVSS 3.1
7.5High
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Xen | Xen | consult Xen advisory XSA-495 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-07-28
- Last updated
- 2026-07-28
- State
- Published
- Assigner (CNA)
- XEN
Exploit prediction (EPSS)
0.45%
Probability of exploitation in 30 days
39.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-400Uncontrolled Resource Consumption