{"id":"CVE-2026-90212","title":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64/efi: Avoid voluntary preemption with efi_mm installed\n\nGus reports a bad kernel memory access when using software PAN\n(CONFIG_ARM64_SW_TTBR0_PAN=y) on a machine w…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64/efi: Avoid voluntary preemption with efi_mm installed\n\nGus reports a bad kernel memory access when using software PAN\n(CONFIG_ARM64_SW_TTBR0_PAN=y) on a machine w…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a5baf582f4c026c25a206ac121bceade926aec74 < 829539c4a650544cb8e5e8690f2c2d0aa2c0e298","Linux >= a5baf582f4c026c25a206ac121bceade926aec74 < e98a9d0146372b046d863164025a66ab4488b972","Linux 6.19"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:16.430","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90212","references":[{"url":"https://git.kernel.org/stable/c/829539c4a650544cb8e5e8690f2c2d0aa2c0e298","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e98a9d0146372b046d863164025a66ab4488b972","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.857Z","epss":0.00155,"epssPercentile":0.0507,"slug":"CVE-2026-90212","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\narm64/efi: Avoid voluntary preemption with efi_mm installed\n\nGus reports a bad kernel memory access when using software PAN\n(CONFIG_ARM64_SW_TTBR0_PAN=y) on a machine with support for EFI runtime\nservices:\n\n  Unable to handle kernel access to user memory outside uaccess routines\n    at virtual address 00000000f322ff30\n  Mem abort info:\n    ESR = 0x0000000096000004\n    FSC = 0x04: level 0 translation fault\n  Internal error: Oops: 0000000096000004 [#1]  SMP\n  Workqueue: efi_rts_wq efi_call_rts\n  pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : efi_call_rts+0xd8/0x288\n  Call trace:\n   efi_call_rts+0xd8/0x288 (P)\n   process_one_work+0x178/0x4f8\n   worker_thread+0x194/0x328\n\nThis is because the fpsimd context management code called from\n__efi_fpsimd_begin() can preempt voluntarily, returning later to the EFI\ncode with an incorrect value for TTBR0_EL1 thanks to the deferred mm\nswitching used by the software PAN implementation.\n\nSince EFI runtime services cannot preempt voluntarily and because the\nfpsimd switching code does not rely on the TTBR0_EL1 mappings, simply\nreorder the fpsimd switch so that it occurs before we change the\npage-table.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}