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

From: Greg Kroah-Hartman <[email protected]>

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.

The Linux kernel CVE team has assigned CVE-2026-74408 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 5.10.261 with commit fb11083db9d7d6fb8f98bbba1cbfcf3fb7b4bf54
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 5.15.212 with commit 734db72d55ca578a344dfa33e30145032c074b25
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 6.1.178 with commit f5931d06b45ed402572bfe5832fff15864ef5481
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 6.6.145 with commit 46ca1451f61b598f45cb5259e066d305444d95fc
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 6.12.97 with commit a9e055ac62cb3fcea262d4b687ec73eed82b3379
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 6.18.40 with commit 5435fd3edcb11c7cc4002847c83e9a50b49284dc
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 7.1.5 with commit 336d4c8cd9b1646060ee690c881d465dfc09c6c0
	Issue introduced in 3.1 with commit fce041beb03f93c7a771f0b4b6c45bb71ef90901 and fixed in 7.2-rc1 with commit 7ce2f118a2389e8f0a64068c6fe7cc7d40639be0

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-74408
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/net/wireless/ath/ath9k/xmit.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	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