Dell BIOS Flaw Lets Attackers Recover Admin Passwords From SPI Flash in Milliseconds

A critical flaw in how Dell stores BIOS administrator and user passwords allows full password recovery from a flash dump in milliseconds, with no brute force required. The vulnerability, tracked as CVE-2026-40639 (DSA-2026-197), stems from a broken XOR encryption scheme rather than a proper cryptographic hash. Dell stores BIOS passwords in...

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