CVE-2026-81013
Low risk· EPSS 8%Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel, the platform/x86 hp-bioscfg driver's validate_password_input() computed length = strlen(buf) and checked buf[length - 1] without first ensuring length is nonzero. Writing an empty string (a bare '\n') to current_password or new_password caused a read of buf[-1], one byte before the heap allocation.
Risk Assessment
A heap out-of-bounds read can disclose a single byte of kernel memory, constituting a confidentiality violation and a potential vector for further attacker analysis.
Recommendation
Update the Linux kernel to a version containing the fix that only checks buf[length - 1] when length is nonzero.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix heap OOB read on empty password write validate_password_input() computes length = strlen(buf) and then checks buf[length - 1] to strip a trailing newline, without checking that length is nonzero first. Writing an empty string (a bare '\n') to current_password or new_password gives length == 0, and buf[length - 1] reads buf[-1], one byte before the heap allocation holding the copied input. KASAN confirms this directly: BUG: KASAN: slab-out-of-bounds in store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg] Read of size 1 at addr ffff88811bd8da9f by task sh/13740 ... store_password_instance.constprop.0+0x223/0x2a0 [hp_bioscfg] current_password_store+0x14/0x20 [hp_bioscfg] ... The buggy address is located 23 bytes to the right of allocated 8-byte region [ffff88811bd8da80, ffff88811bd8da88) Reproduced identically via new_password_store. Execution continues past the bad read (the garbage byte only affects whether "length" is decremented by one), so the write completes and returns success; this is a pure information read past the buffer, not a crash, but it is still an out-of-bounds access KASAN correctly flags. Fix by only checking buf[length - 1] when length is nonzero.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS