CVE-2026-80933: wifi: mt76: mt7996: validate default EEPROM firmware size

CVE-2026-80933: wifi: mt76: mt7996: validate default EEPROM firmware size

[Greg Kroah-Hartman]

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

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

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

wifi: mt76: mt7996: validate default EEPROM firmware size

The default EEPROM firmware is parsed and copied as a full EEPROM
without checking its length. A truncated file can make the driver
read beyond the firmware buffer during variant validation or the
fallback copy.

Reject files shorter than MT7996_EEPROM_SIZE before parsing or
copying the firmware.

The Linux kernel CVE team has assigned CVE-2026-80933 to this issue.


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

	Issue introduced in 6.2 with commit 98686cd21624c75a043e96812beadddf4f6f48e5 and fixed in 6.18.50 with commit 03b81f015dbb29807ce1ec6d45537d658abdac69
	Issue introduced in 6.2 with commit 98686cd21624c75a043e96812beadddf4f6f48e5 and fixed in 7.2.4 with commit 7074ec3769820302f1ccf8794a40a6582153b820
	Issue introduced in 6.2 with commit 98686cd21624c75a043e96812beadddf4f6f48e5 and fixed in 7.3-rc1 with commit 653c6e289b13cc6942f3e8f8e3c568e70fa42d1f

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-2026-80933
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/mt7996/eeprom.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/03b81f015dbb29807ce1ec6d45537d658abdac69
	https://git.kernel.org/stable/c/7074ec3769820302f1ccf8794a40a6582153b820
	https://git.kernel.org/stable/c/653c6e289b13cc6942f3e8f8e3c568e70fa42d1f