{"id":"CVE-2026-64287","summary":"KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU\n\nflush_hyp_vcpu() copies the host vGIC state into the hyp's private vCPU\non every run. The vGIC list register save and restore use used_lrs as\ntheir loop bound and expect it to stay within the number of implemented\nlist registers. While this is generally the case, flush_hyp_vcpu()\ncopies vgic_v3 verbatim and does not enforce this, so a value provided\nby the host is used at EL2 to index vgic_lr[] and access ICH_LR\u003cn\u003e_EL2\n(host -\u003e EL2).\n\nFix by clamping used_lrs to the number of implemented list registers\nafter the copy, as the trusted path already does in\nvgic_flush_lr_state(). The number of implemented list registers is\nconstant after init, so it is replicated once from\nkvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on\nevery entry.","modified":"2026-08-18T03:31:13.480683261Z","published":"2026-07-25T08:49:28.168Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64287.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8cc8bbbfab14c22c5551d0dd19b208a44b141c76"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9fa301d8298778dd799fa4dcf7a7f440715d146e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c646431865f4b1a5b14067233fa27b11e05e0d46"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64287.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64287"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"be66e67f175096f283c9d5614c4991fc9e7ed975"},{"fixed":"2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"},{"fixed":"9fa301d8298778dd799fa4dcf7a7f440715d146e"},{"fixed":"c646431865f4b1a5b14067233fa27b11e05e0d46"},{"fixed":"7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"},{"fixed":"8cc8bbbfab14c22c5551d0dd19b208a44b141c76"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64287.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64287.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"}]}