KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vGIC state into the hyp's private vCPU on every run. The vGIC list register save and restore use used_lrs as their loop bound and expect it to stay within the number of implemented list registers. While this is generally the case, flush_hyp_vcpu() copies vgic_v3 verbatim and does not enforce this, so a value provided by the host is used at EL2 to index vgic_lr[] and access ICH_LR_EL2 (host -> EL2). Fix by clamping used_lrs to the number of implemented list registers after the copy, as the trusted path already does in vgic_flush_lr_state(). The number of implemented list registers is constant after init, so it is replicated once from kvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on every entry.
CVE-2026-64287
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64287
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "be66e67f175096f283c9d5614c4991fc9e7ed975",
"lessThan": "2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8",
"versionType": "git"
},
{
"status": "affected",
"version": "be66e67f175096f283c9d5614c4991fc9e7ed975",
"lessThan": "9fa301d8298778dd799fa4dcf7a7f440715d146e",
"versionType": "git"
},
{
"status": "affected",
"version": "be66e67f175096f283c9d5614c4991fc9e7ed975",
"lessThan": "c646431865f4b1a5b14067233fa27b11e05e0d46",
"versionType": "git"
},
{
"status": "affected",
"version": "be66e67f175096f283c9d5614c4991fc9e7ed975",
"lessThan": "7fca3fcef81c713bc82a37bf741e0f28e6d04a6f",
"versionType": "git"
},
{
"status": "affected",
"version": "be66e67f175096f283c9d5614c4991fc9e7ed975",
"lessThan": "8cc8bbbfab14c22c5551d0dd19b208a44b141c76",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/include/asm/kvm_hyp.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/hyp/nvhe/hyp-main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/include/asm/kvm_hyp.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/hyp/nvhe/hyp-main.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64287
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40996 · Revision 1
- Added to Heist Feed
- Publisher date