mm/secretmem: fix use-after-free race in fault handler

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CVE-2025-40272 · Microsoft / collected KEV context

cve-program · CVE-2025-40272

• https://git.kernel.org/stable/c/bb1c19636aedae39360e6fdbcaef4f2bcff25785
• https://git.kernel.org/stable/c/1e4643d6628edf9c0047b1f8f5bc574665025acb
• https://git.kernel.org/stable/c/42d486d35a4143cc37fc72ee66edc99d942dd367
• https://git.kernel.org/stable/c/52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649
• https://git.kernel.org/stable/c/4444767e625da46009fc94a453fd1967b80ba047
• https://git.kernel.org/stable/c/6f86d0534fddfbd08687fa0f01479d4226bc3c3d

No related operational record is retained in the current change model.