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CVE-2026-40639 is a weakness in Dell Client Platform BIOS password storage in which BIOS administrator and user passwords are stored in the DVAR region of SPI flash using reversible encoding rather than a one-way hash. On affected platforms, the first byte of the password is stored in cleartext and the remaining bytes are encoded with a repeating XOR-based scheme derived from device-static data and that first password byte. Because password records are null-padded, the encoded storage format can leak sufficient key material to recover the full encoding key for shorter passwords, enabling deterministic recovery of stored BIOS passwords from a flash dump. The vulnerable implementation was reported in the SystemPwSmm SMM driver used across multiple Dell client platforms. Historical password records retained in the log-structured DVAR storage can also assist recovery of longer current passwords in some cases. The issue affects confidentiality of BIOS credentials and can enable unauthorized access to BIOS configuration on vulnerable systems.
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Cross-references every affected SKU, including bundled OEM variants.
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