{"id":"CVE-2026-98638","revision":"8c1ec74e73dd457992375b87a9d31601","records":[{"revision":"8c1ec74e73dd457992375b87a9d31601","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98638","aliases":[],"title":"KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()\n\npkvm_vcpu_init_sve() clamps only the upper bound of the host-provided\nsve_max_vl, so an invalid vector length reaches sve_state_size_from_vl()\nand the WARN_ON() there, which is fatal at EL2. The existing\n!sve_state_size test rejects such a length, but only after the macro has\nrun.\n\nCheck sve_vl_valid() before deriving the state size. A valid length\ncannot yield a zero size, so the !sve_state_size test goes with it.","state":0,"publishedAt":"2026-10-18T15:20:09.38+00:00","modifiedAt":"2026-10-19T09:23:08.052+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/arm64/kvm/hyp/nvhe/pkvm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5db1bef933427aa467ad89c7b695a84a6b4afe16\",\n                            \"lessThan\": \"faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5db1bef933427aa467ad89c7b695a84a6b4afe16\",\n                            \"lessThan\": \"bae3e4493046de4fefa15f809d9b8dc114e84a3d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5db1bef933427aa467ad89c7b695a84a6b4afe16\",\n                            \"lessThan\": \"2a2eb10795a1e495aebc7f829ccecb72c05b4fd9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/arm64/kvm/hyp/nvhe/pkvm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc","https://git.kernel.org/stable/c/bae3e4493046de4fefa15f809d9b8dc114e84a3d","https://git.kernel.org/stable/c/2a2eb10795a1e495aebc7f829ccecb72c05b4fd9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98638","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98638","identifiers":["CVE-2026-98638"]},"retained":false,"historicalAffected":[]}],"coverage":[]}