CVE-2026-64287KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from be66e67f175096f283c9d5614c4991fc9e7ed975 before 2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8; from be66e67f175096f283c9d5614c4991fc9e7ed975 before 9fa301d8298778dd799fa4dcf7a7f440715d146e; from be66e67f175096f283c9d5614c4991fc9e7ed975 before c646431865f4b1a5b14067233fa27b11e05e0d46; from be66e67f175096f283c9d5614c4991fc9e7ed975 before 7fca3fcef81c713bc82a37bf741e0f28e6d04a6f; from be66e67f175096f283c9d5614c4991fc9e7ed975 before 8cc8bbbfab14c22c5551d0dd19b208a44b141c76 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.145; from 6.7 before 6.12.97; from 6.13 before 6.18.40; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8patch
- https://git.kernel.org/stable/c/9fa301d8298778dd799fa4dcf7a7f440715d146epatch
- https://git.kernel.org/stable/c/c646431865f4b1a5b14067233fa27b11e05e0d46patch
- https://git.kernel.org/stable/c/7fca3fcef81c713bc82a37bf741e0f28e6d04a6fpatch
- https://git.kernel.org/stable/c/8cc8bbbfab14c22c5551d0dd19b208a44b141c76patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.