null_blk: serialize configfs attribute stores with the lock

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-90185 · Microsoft / collected KEV context

cve-program · CVE-2026-90185

• https://git.kernel.org/stable/c/8e839ed5210399a0330a8a6c5885c1d40a537c6d
• https://git.kernel.org/stable/c/88d806d0e1d36246208386a8e55b511c1b3d647c
• https://git.kernel.org/stable/c/3945ce8cbce4e328e6fdf0b522dc71e340de19db
• https://git.kernel.org/stable/c/65cae82fd3c39b53430672cb9e3ecd267471a6ce
• https://git.kernel.org/stable/c/c70994c2862b05e44728912b2ea9487d31e2aea7
• https://git.kernel.org/stable/c/7e7fff51808237703a3a1df6dd5cae1dfd1db86d

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