arm64/boot: Disable trapping of PMZR_EL0 writes to EL2

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Summary

CVECVE-2026-98546
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:06 UTC
Updated2026-10-18 16:17:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 686d8f7b592f3466f44aea653c8147611b351c83 bb8c90c86441c090e9036f019cf1b4d7894a2c40 git Not specified
CNA Linux Linux affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 071f51188a5d8ec10535541255587976d12fc7d8 git Not specified
CNA Linux Linux affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 ce71865bf43f88bed9d9218e9218e537150be506 git Not specified
CNA Linux Linux affected 858c7bfcb35e1100b58bb63c9f562d86e09418d9 2bc6b218717b9d08f466f88209251d54bc09b207 git Not specified
CNA Linux Linux affected 882f78400322c0aec4b641a7168adad9a66bc0c2 git Not specified
CNA Linux Linux affected 6.12.25 6.12.112 semver Not specified
CNA Linux Linux affected 6.14.4 6.15 semver Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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