{"schema":"threatline.record/2","record":{"id":"CVE-2026-98546","aliases":[],"summary":"arm64/boot: Disable trapping of PMZR_EL0 writes to EL2","details":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64/boot: Disable trapping of PMZR_EL0 writes to EL2\n\n__init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2.\nPMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in\nHDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host\ntraps to EL2, where the nVHE hypervisor has no handler and BUG()s. The\nkernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU\ndriver set PMUSERENR_EL0.UEN for a task with a user-read event, so a\nwrite from EL0 reaches the trap and takes the host down without a panic\nmessage.\n\nAccumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already\ndoes for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9\nbits.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"686d8f7b592f3466f44aea653c8147611b351c83","lessThan":"bb8c90c86441c090e9036f019cf1b4d7894a2c40","status":"affected","versionType":"git"},{"version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","lessThan":"071f51188a5d8ec10535541255587976d12fc7d8","status":"affected","versionType":"git"},{"version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","lessThan":"ce71865bf43f88bed9d9218e9218e537150be506","status":"affected","versionType":"git"},{"version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","lessThan":"2bc6b218717b9d08f466f88209251d54bc09b207","status":"affected","versionType":"git"},{"version":"882f78400322c0aec4b641a7168adad9a66bc0c2","status":"affected","versionType":"git"},{"version":"6.12.25","lessThan":"6.12.112","status":"affected","versionType":"semver"},{"version":"6.14.4","lessThan":"6.15","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","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-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"071f51188a5d8ec10535541255587976d12fc7d8","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2bc6b218717b9d08f466f88209251d54bc09b207","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.12.112","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","source_modified_at":"2026-10-19T09:21:29.442Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.15","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.0934,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:18:14.808Z","modified_at":"2026-10-19T09:21:29.442Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:21:29.442Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98546","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/bb8c90c86441c090e9036f019cf1b4d7894a2c40"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207"}],"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":"2026-10-19T09:21:29.442Z","content_hash":"033514e089965a62473e1eeb9b880665b250ca0c1baeed0c1601aa593f443caf"}}