SB20261022481 - Signed to Unsigned Conversion Error in Linux kernel hid bpf driver

Description

This security bulletin contains information about 1 vulnerability.

1) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-98860)

CWE-ID: CWE-195 - Signed to Unsigned Conversion Error

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause BPF programs to operate on uninitialized or stale data.

The vulnerability exists due to an implicit signed-to-unsigned conversion in hid_bpf_hw_request() when comparing a negative transport-driver error code against an unsigned buffer size. A local privileged user can issue a HID hardware request that encounters a transport error to cause the negative error code to be treated as a large positive value, incorrectly report success, and copy unmodified buffer contents back to the BPF program.

Remediation

Install update from vendor's website.

References

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