{"api_version":"1","generated_at":"2026-10-22T03:33:09+00:00","cve":"CVE-2026-98546","urls":{"html":"https://cve.report/CVE-2026-98546","api":"https://cve.report/api/cve/CVE-2026-98546.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98546","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98546"},"summary":{"title":"arm64/boot: Disable trapping of PMZR_EL0 writes to EL2","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:06","updated_at":"2026-10-18 16:17:06"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8","name":"https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40","name":"https://git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207","name":"https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506","name":"https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98546","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98546","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 686d8f7b592f3466f44aea653c8147611b351c83 bb8c90c86441c090e9036f019cf1b4d7894a2c40 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 071f51188a5d8ec10535541255587976d12fc7d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 ce71865bf43f88bed9d9218e9218e537150be506 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 2bc6b218717b9d08f466f88209251d54bc09b207 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 882f78400322c0aec4b641a7168adad9a66bc0c2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.25 6.12.112 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.14.4 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["Documentation/arch/arm64/booting.rst","arch/arm64/include/asm/el2_setup.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"bb8c90c86441c090e9036f019cf1b4d7894a2c40","status":"affected","version":"686d8f7b592f3466f44aea653c8147611b351c83","versionType":"git"},{"lessThan":"071f51188a5d8ec10535541255587976d12fc7d8","status":"affected","version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","versionType":"git"},{"lessThan":"ce71865bf43f88bed9d9218e9218e537150be506","status":"affected","version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","versionType":"git"},{"lessThan":"2bc6b218717b9d08f466f88209251d54bc09b207","status":"affected","version":"858c7bfcb35e1100b58bb63c9f562d86e09418d9","versionType":"git"},{"status":"affected","version":"882f78400322c0aec4b641a7168adad9a66bc0c2","versionType":"git"},{"lessThan":"6.12.112","status":"affected","version":"6.12.25","versionType":"semver"},{"lessThan":"6.15","status":"affected","version":"6.14.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["Documentation/arch/arm64/booting.rst","arch/arm64/include/asm/el2_setup.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.15"},{"lessThan":"6.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"6.12.25","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:21:29.442Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40"},{"url":"https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8"},{"url":"https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506"},{"url":"https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207"}],"title":"arm64/boot: Disable trapping of PMZR_EL0 writes to EL2","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98546","datePublished":"2026-10-18T15:18:14.808Z","dateReserved":"2026-09-25T10:25:14.356Z","dateUpdated":"2026-10-19T09:21:29.442Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:06","lastModifiedDate":"2026-10-18 16:17:06","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98546","Ordinal":"1","Title":"arm64/boot: Disable trapping of PMZR_EL0 writes to EL2","CVE":"CVE-2026-98546","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98546","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"arm64/boot: Disable trapping of PMZR_EL0 writes to EL2"}]}}}