KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU (Linux Linux)

CVE-2026-64287
HIGH 8.2

En bref

Source
NVD
EPSS
EPSS 0.18 % · centile 7 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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<n>_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.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HLinux
CVSS 3.1HIGH 8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected be66e67f175096f283c9d5614c4991fc9e7ed975 < 2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8 ; affected be66e67f175096f283c9d5614c4991fc9e7ed975 < 9fa301d8298778dd799fa4dcf7a7f440715d146e ; affected be66e67f175096f283c9d5614c4991fc9e7ed975 < c646431865f4b1a5b14067233fa27b11e05e0d46 ; affected be66e67f175096f283c9d5614c4991fc9e7ed975 < 7fca3fcef81c713bc82a37bf741e0f28e6d04a6f ; affected be66e67f175096f283c9d5614c4991fc9e7ed975 < 8cc8bbbfab14c22c5551d0dd19b208a44b141c76
Linux · Linuxaffected 6.2 ; unaffected 0 < 6.2 ; unaffected 6.6.145 ≤ 6.6.* ; unaffected 6.12.97 ≤ 6.12.* ; unaffected 6.18.40 ≤ 6.18.* ; unaffected 7.1.4 ≤ 7.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD