CVE-2026-64286
Last modified
CVE-2026-64286 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vCPU context into the hyp's private vCPU on every run. ctxt_to_vcpu() expects a guest context to have a NULL __hyp_running_vcpu, which is only ever set on the host context, so that it resolves the vCPU via container_of(). EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vCPU context into the hyp's private vCPU on every run. ctxt_to_vcpu() expects a guest context to have a NULL __hyp_running_vcpu, which is only ever set on the host context, so that it resolves the vCPU via container_of(). While this is generally the case, flush_hyp_vcpu() copies the context verbatim and does not enforce this, so a value provided by the host is dereferenced at EL2 (host -> EL2). Fix by clearing __hyp_running_vcpu after the copy.
Metrics
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= be66e67f175096f283c9d5614c4991fc9e7ed975, < 477145860dba4c30f0b4e36f02f4c5291c1c888b; >= be66e67f175096f283c9d5614c4991fc9e7ed975, < dfaef40d8a1533940fc1af788d70fce07362b4ce; >= be66e67f175096f283c9d5614c4991fc9e7ed975, < 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa; >= be66e67f175096f283c9d5614c4991fc9e7ed975, < d4f4d61715d1061ba83b88196a3605662be30750; >= be66e67f175096f283c9d5614c4991fc9e7ed975, < e8042f6e1d7befb2fb6b10a75918642bcd0acf9a |
| Linux | Linux | 6.2 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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