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Vulnerability record · CVE-2026-64286 · published 25 July 2026

CVE-2026-64286: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.2 CVSS 3.1 High EPSS 0.18% · top 93.8%
8.2CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888b Patch
https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa Patch
https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750 Patch
https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ce Patch
https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64286), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.