{"id":"CVE-2026-98546","revision":"3fa337f2a45748eebd0623bfda8d9b7c","records":[{"revision":"3fa337f2a45748eebd0623bfda8d9b7c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98546","aliases":[],"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":0,"publishedAt":"2026-10-18T15:18:14.808+00:00","modifiedAt":"2026-10-19T09:21:29.442+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                        \"Documentation/arch/arm64/booting.rst\",\n                        \"arch/arm64/include/asm/el2_setup.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"686d8f7b592f3466f44aea653c8147611b351c83\",\n                            \"lessThan\": \"bb8c90c86441c090e9036f019cf1b4d7894a2c40\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"858c7bfcb35e1100b58bb63c9f562d86e09418d9\",\n                            \"lessThan\": \"071f51188a5d8ec10535541255587976d12fc7d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"858c7bfcb35e1100b58bb63c9f562d86e09418d9\",\n                            \"lessThan\": \"ce71865bf43f88bed9d9218e9218e537150be506\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"858c7bfcb35e1100b58bb63c9f562d86e09418d9\",\n                            \"lessThan\": \"2bc6b218717b9d08f466f88209251d54bc09b207\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"882f78400322c0aec4b641a7168adad9a66bc0c2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.12.25\",\n                            \"lessThan\": \"6.12.112\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.14.4\",\n                            \"lessThan\": \"6.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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                        \"Documentation/arch/arm64/booting.rst\",\n                        \"arch/arm64/include/asm/el2_setup.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\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/bb8c90c86441c090e9036f019cf1b4d7894a2c40","https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8","https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506","https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98546","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98546","identifiers":["CVE-2026-98546"]},"retained":false,"historicalAffected":[]}],"coverage":[]}