{"schema":"threatline.record/2","record":{"id":"CVE-2026-98638","aliases":[],"summary":"KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98638","source_modified_at":"2026-10-19T09:23:08.052Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5db1bef933427aa467ad89c7b695a84a6b4afe16","lessThan":"faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc","status":"affected","versionType":"git"},{"version":"5db1bef933427aa467ad89c7b695a84a6b4afe16","lessThan":"bae3e4493046de4fefa15f809d9b8dc114e84a3d","status":"affected","versionType":"git"},{"version":"5db1bef933427aa467ad89c7b695a84a6b4afe16","lessThan":"2a2eb10795a1e495aebc7f829ccecb72c05b4fd9","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98638","source_modified_at":"2026-10-19T09:23:08.052Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98638","source_modified_at":"2026-10-19T09:23:08.052Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2a2eb10795a1e495aebc7f829ccecb72c05b4fd9","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00166,"percentile":0.0552,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:20:09.380Z","modified_at":"2026-10-19T09:23:08.052Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98638","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:23:08.052Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98638","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bae3e4493046de4fefa15f809d9b8dc114e84a3d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2a2eb10795a1e495aebc7f829ccecb72c05b4fd9"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:23:08.052Z","content_hash":"2fc076dc580c0d49bd598e5da0ff0d4f076f4d2b1653f8e1dbb08547b26037e9"}}