{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98546","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.356Z","datePublished":"2026-10-18T15:18:14.808Z","dateUpdated":"2026-10-19T09:21:29.442Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-19T09:21:29.442Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/arch/arm64/booting.rst","arch/arm64/include/asm/el2_setup.h"],"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"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/arch/arm64/booting.rst","arch/arm64/include/asm/el2_setup.h"],"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"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.25","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.4"}]}]}],"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"}}}}