CVE-2026-81011
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel's platform/x86 hp-bioscfg module, the per-type ACPI package parsers were handed the wrong element count — instead of the validated obj->package.count they derived it from the NAME field (an ACPI_TYPE_STRING), effectively reading string.length through the acpi_object union. This is safe today because hp_init_bios_package_attribute() rejects packages with fewer elements than the type requires, but an upcoming relaxation of that check would cause an out-of-bounds heap read. The fix forwards the validated obj->package.count to every parser.
Risk Assessment
The vulnerability is not currently exploitable on its own, but it is a prerequisite for a future out-of-bounds heap read that could lead to data disclosure or a kernel crash once the change accepting shorter packages is applied.
Recommendation
Update the Linux kernel to a version containing this fix (hp-bioscfg module) and avoid applying changes that relax the element count check without this fix in place.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: pass validated element count to package parsers The per-type package parsers are handed the wrong element count. hp_init_bios_package_attribute() validates obj->package.count and then calls one of the five hp_populate_*_package_data() wrappers (string, integer, enumeration, ordered list, password). Each wrapper forwards a count to its hp_populate_*_elements_from_package() parser, but instead of forwarding the validated obj->package.count it derives the count from elements[0]. elements[0] is the NAME field and is always an ACPI_TYPE_STRING, so reading ->package.count from it in fact reads ->string.length through the union acpi_object. The parsers thus bound themselves against the length of the name string rather than against the real number of elements in the package. This is safe today because hp_init_bios_package_attribute() refuses any package that has fewer than the type's element count, so a parser only ever runs on a full package and never reads past it regardless of the bogus bound. An upcoming change relaxes that check to accept shorter packages. Once a parser can receive fewer elements than its per-type count, a bound taken from the name length no longer reflects the array size, and the "elem < count" loop conditions and "elem + n >= count" sub-loop guards read past the end of elements[] - an out-of-bounds heap read. Forward the validated obj->package.count to every *_package_data() wrapper so the parsers bound themselves against the real package size. This does not change behaviour for the packages that enumerate correctly today and is a prerequisite for accepting shorter packages safely.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS