CVE-2026-64286

KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU

State: Published
Severity: 8.2 High
Published: Jul 25, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	Linux

Weaknesses

CWE-822 Untrusted Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	be66e67f175096f283c9d5614c4991fc9e7ed975 to before 477145860dba4c30f0b4e36f02f4c5291c1c888bAffected be66e67f175096f283c9d5614c4991fc9e7ed975 to before dfaef40d8a1533940fc1af788d70fce07362b4ceAffected be66e67f175096f283c9d5614c4991fc9e7ed975 to before 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfaAffected be66e67f175096f283c9d5614c4991fc9e7ed975 to before d4f4d61715d1061ba83b88196a3605662be30750Affected be66e67f175096f283c9d5614c4991fc9e7ed975 to before e8042f6e1d7befb2fb6b10a75918642bcd0acf9aAffected
LinuxLinux	6.2Affected before 6.2Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

be66e67f175096f283c9d5614c4991fc9e7ed975 to before 477145860dba4c30f0b4e36f02f4c5291c1c888bAffected
be66e67f175096f283c9d5614c4991fc9e7ed975 to before dfaef40d8a1533940fc1af788d70fce07362b4ceAffected
be66e67f175096f283c9d5614c4991fc9e7ed975 to before 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfaAffected
be66e67f175096f283c9d5614c4991fc9e7ed975 to before d4f4d61715d1061ba83b88196a3605662be30750Affected
be66e67f175096f283c9d5614c4991fc9e7ed975 to before e8042f6e1d7befb2fb6b10a75918642bcd0acf9aAffected

LinuxLinux

6.2Affected
before 6.2Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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