CVE-2026-98860HID: bpf: cast size to ssize_t when checking hid_bpf_hw_request

Official description

In the Linux kernel, the following vulnerability has been resolved: HID: bpf: cast size to ssize_t when checking hid_bpf_hw_request As reported by Sashiko: If a transport driver encounters a hardware error and returns a negative error code such as -EPIPE, ret is implicitly promoted to size_t when compared against size. This causes the negative error code to evaluate as a large positive number, making the (ret > size) condition true. This silently converts the hardware error into a success return value and copies the unmodified buffer back, which could leave BPF programs operating on uninitialized or stale data. Fix this by casting size into ssize_t to return the actual negative error code.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/8b85ef0f561039e249c3f883c5280a1449c6dbee
• https://git.kernel.org/stable/c/97be6396817bd3b11d06239010d27902940bfaa9
• https://git.kernel.org/stable/c/f9f808227554b2c116fd07dd2328ecd74ea3f411
• https://git.kernel.org/stable/c/3afefbfe55c2a8a0c4bdf6f4cc1f773da120027c