Linux Kernel HID: bpf Fix - Cast size to ssize_t Avoids Erroneous Success
CVE-2026-98860 Published on October 18, 2026
HID: bpf: cast size to ssize_t when checking hid_bpf_hw_request
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.
Products Associated with CVE-2026-98860
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version d6efaa50af62fb0790dd1fd4e7e5506b46312510 and below 8b85ef0f561039e249c3f883c5280a1449c6dbee is affected.
- Version 73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1 and below 97be6396817bd3b11d06239010d27902940bfaa9 is affected.
- Version 2b658c1c442ec1cd9eec5ead98d68662c40fe645 and below f9f808227554b2c116fd07dd2328ecd74ea3f411 is affected.
- Version 2b658c1c442ec1cd9eec5ead98d68662c40fe645 and below 3afefbfe55c2a8a0c4bdf6f4cc1f773da120027c is affected.
- Version eb57dae20fdf6f3069cdc07821fa3bb46de381d7 is affected.
- Version 6.12.78 and below 6.12.113 is affected.
- Version 6.18.20 and below 6.18.56 is affected.
- Version 6.19.10 and below 6.20 is affected.
- Version 7.0 is affected.
- Before 7.0 is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.56, <= 6.18.* is unaffected.
- Version 7.2.10, <= 7.2.* is unaffected.
- Version 7.3-rc6, <= * is unaffected.