ubifs: fix out-of-bounds read in signature length check

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

CVE-2026-89720 · Microsoft / collected KEV context

cve-program · CVE-2026-89720

• https://git.kernel.org/stable/c/ab7405bd86331cc2dbc8201699d4adc33bea75e7
• https://git.kernel.org/stable/c/11abc34698cb3172badf8aa12e623f1bac98bbd8
• https://git.kernel.org/stable/c/8cc3da72cf57acb4b77442ea8cec48425dff7c06
• https://git.kernel.org/stable/c/37a9d25a563f5f9103282954ce573c4a61321e7c
• https://git.kernel.org/stable/c/f76b79d6e42af20682495bccd22f72c7164b0018
• https://git.kernel.org/stable/c/a1dc246f98bb94233effa4fa3ec7bf84700bb7d1
• https://git.kernel.org/stable/c/83e1aa9f5f906c9b1f4949d0521f0f950a159d96
• https://git.kernel.org/stable/c/95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf

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