linux-cve-announce - CVE-2023-53232: mt76: mt7921: fix kernel panic by accessing unallocated eeprom.data

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Message-ID: <2025091515-CVE-2023-53232-39fa@gregkh>
Date: Mon, 15 Sep 2025 16:22:06 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53232: mt76: mt7921: fix kernel panic by accessing unallocated eeprom.data

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

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

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

mt76: mt7921: fix kernel panic by accessing unallocated eeprom.data

The MT7921 driver no longer uses eeprom.data, but the relevant code has not
been removed completely since
commit 16d98b548365 ("mt76: mt7921: rely on mcu_get_nic_capability").
This could result in potential invalid memory access.

To fix the kernel panic issue in mt7921, it is necessary to avoid accessing
unallocated eeprom.data which can lead to invalid memory access.

Furthermore, it is possible to entirely eliminate the
mt7921_mcu_parse_eeprom function and solely depend on
mt7921_mcu_parse_response to divide the RxD header.

[2.702735] BUG: kernel NULL pointer dereference, address: 0000000000000550
[2.702740] #PF: supervisor write access in kernel mode
[2.702741] #PF: error_code(0x0002) - not-present page
[2.702743] PGD 0 P4D 0
[2.702747] Oops: 0002 [#1] PREEMPT SMP NOPTI
[2.702755] RIP: 0010:mt7921_mcu_parse_response+0x147/0x170 [mt7921_common]
[2.702758] RSP: 0018:ffffae7c00fef828 EFLAGS: 00010286
[2.702760] RAX: ffffa367f57be024 RBX: ffffa367cc7bf500 RCX: 0000000000000000
[2.702762] RDX: 0000000000000550 RSI: 0000000000000000 RDI: ffffa367cc7bf500
[2.702763] RBP: ffffae7c00fef840 R08: ffffa367cb167000 R09: 0000000000000005
[2.702764] R10: 0000000000000000 R11: ffffffffc04702e4 R12: ffffa367e8329f40
[2.702766] R13: 0000000000000000 R14: 0000000000000001 R15: ffffa367e8329f40
[2.702768] FS:  000079ee6cf20c40(0000) GS:ffffa36b2f940000(0000) knlGS:0000000000000000
[2.702769] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2.702775] CR2: 0000000000000550 CR3: 00000001233c6004 CR4: 0000000000770ee0
[2.702776] PKRU: 55555554
[2.702777] Call Trace:
[2.702782]  mt76_mcu_skb_send_and_get_msg+0xc3/0x11e [mt76 <HASH:1bc4 5>]
[2.702785]  mt7921_run_firmware+0x241/0x853 [mt7921_common <HASH:6a2f 6>]
[2.702789]  mt7921e_mcu_init+0x2b/0x56 [mt7921e <HASH:d290 7>]
[2.702792]  mt7921_register_device+0x2eb/0x5a5 [mt7921_common <HASH:6a2f 6>]
[2.702795]  ? mt7921_irq_tasklet+0x1d4/0x1d4 [mt7921e <HASH:d290 7>]
[2.702797]  mt7921_pci_probe+0x2d6/0x319 [mt7921e <HASH:d290 7>]
[2.702799]  pci_device_probe+0x9f/0x12a

The Linux kernel CVE team has assigned CVE-2023-53232 to this issue.


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

	Issue introduced in 5.16 with commit 16d98b548365fcd6fc3fe2e1ae73c9e3cc5ee43d and fixed in 6.1.28 with commit 11181b6c8641cd417935b76ea997d0169f2db262
	Issue introduced in 5.16 with commit 16d98b548365fcd6fc3fe2e1ae73c9e3cc5ee43d and fixed in 6.2.15 with commit c8ba6780c65f681d217de79e17d63d5d538a239f
	Issue introduced in 5.16 with commit 16d98b548365fcd6fc3fe2e1ae73c9e3cc5ee43d and fixed in 6.3.2 with commit ec4d97e8eddcfa9f63f2f62adec5fb4f941ba2ef
	Issue introduced in 5.16 with commit 16d98b548365fcd6fc3fe2e1ae73c9e3cc5ee43d and fixed in 6.4 with commit 12db28c3ef31f719bd18fa186a40bb152e6a527c

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-2023-53232
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/mt7921/mcu.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/11181b6c8641cd417935b76ea997d0169f2db262
	https://git.kernel.org/stable/c/c8ba6780c65f681d217de79e17d63d5d538a239f
	https://git.kernel.org/stable/c/ec4d97e8eddcfa9f63f2f62adec5fb4f941ba2ef
	https://git.kernel.org/stable/c/12db28c3ef31f719bd18fa186a40bb152e6a527c