CVE-2026-89523: wifi: mt76: mt7925: cancel pending mlo_pm_work

CVE-2026-89523: wifi: mt76: mt7925: cancel pending mlo_pm_work

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7925: cancel pending mlo_pm_work

If the device is reset, suspended or unregistered within that window,
the pending work can still run and access vif/bss data that may already
be freed, or send MCU commands while the firmware is not available.

Add cancel_delayed_work_sync(&dev->mlo_pm_work) in all relevant teardown
and suspend paths:

 - mt7925_mac_reset_work()        (chip reset recovery)
 - mt7925e_unregister_device()    (PCIe unbind)
 - mt7925_pci_suspend()           (PCIe bus suspend)
 - mt7925_suspend()               (mac80211 suspend)
 - mt7925u_suspend()              (USB bus / runtime suspend)

This ensures the work is stopped before the device state becomes
invalid.

The Linux kernel CVE team has assigned CVE-2026-89523 to this issue.


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

	Issue introduced in 6.15 with commit 276a568832577c81ec90b62dc506bbdc3781ca46 and fixed in 6.18.50 with commit 5be6d02837d418bc6c805b5cab1b338de6de9ca7
	Issue introduced in 6.15 with commit 276a568832577c81ec90b62dc506bbdc3781ca46 and fixed in 7.2.4 with commit c5e073f2fbfd34d22099a50d96f60990799753e2
	Issue introduced in 6.15 with commit 276a568832577c81ec90b62dc506bbdc3781ca46 and fixed in 7.3-rc1 with commit 2889e84282dda147f10b10d94cf0efd90a349c53
	Issue introduced in 6.14.3 with commit 74eb79258bfd5f2ffe6d26a09c898992b2afa1ce

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-2026-89523
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/mediatek/mt76/mt7925/mac.c
	drivers/net/wireless/mediatek/mt76/mt7925/main.c
	drivers/net/wireless/mediatek/mt76/mt7925/pci.c
	drivers/net/wireless/mediatek/mt76/mt7925/usb.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/5be6d02837d418bc6c805b5cab1b338de6de9ca7
	https://git.kernel.org/stable/c/c5e073f2fbfd34d22099a50d96f60990799753e2
	https://git.kernel.org/stable/c/2889e84282dda147f10b10d94cf0efd90a349c53