CVE-2022-49112

published 2025-02-26

CVE-2022-49112: In the Linux kernel, the following vulnerability has been resolved: mt76: fix monitor mode crash with sdio driver mt7921s driver may receive frames with…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

mt76: fix monitor mode crash with sdio driver

mt7921s driver may receive frames with fragment buffers. If there is a
CTS packet received in monitor mode, the payload is 10 bytes only and
need 6 bytes header padding after RXD buffer. However, only RXD in the
first linear buffer, if we pull buffer size RXD-size+6 bytes with
skb_pull(), that would trigger "BUG_ON(skb->len data_len)" in
__skb_pull().

To avoid the nonlinear buffer issue, enlarge the RXD size from 128 to
256 to make sure all MCU operation in linear buffer.

[ 52.007562] kernel BUG at include/linux/skbuff.h:2313!
[ 52.007578] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 52.007987] pc : skb_pull+0x48/0x4c
[ 52.008015] lr : mt7921_queue_rx_skb+0x494/0x890 [mt7921_common]
[ 52.008361] Call trace:
[ 52.008377] skb_pull+0x48/0x4c
[ 52.008400] mt76s_net_worker+0x134/0x1b0 [mt76_sdio 35339a92c6eb7d4bbcc806a1d22f56365565135c]
[ 52.008431] __mt76_worker_fn+0xe8/0x170 [mt76 ef716597d11a77150bc07e3fdd68eeb0f9b56917]
[ 52.008449] kthread+0x148/0x3ac
[ 52.008466] ret_from_fork+0x10/0x30

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.17.3-1 (bookworm)	linux 5.17.3-1 (bookworm)
linux	linux	—	—
linux	linux	>= 7bc04215a66b60e198aecaee8418f6d79fa19faa < 13946d5a68efd11dd6af2f6ef4c908f6b00158a5	13946d5a68efd11dd6af2f6ef4c908f6b00158a5
linux	linux	>= 7bc04215a66b60e198aecaee8418f6d79fa19faa < c37b4cab3d97ef64b206fca4d9daabd9aff7356e	c37b4cab3d97ef64b206fca4d9daabd9aff7356e
linux	linux	>= 7bc04215a66b60e198aecaee8418f6d79fa19faa < 95e2af01669c7a3cb7a933cefa06361f9db15059	95e2af01669c7a3cb7a933cefa06361f9db15059
linux	linux	>= 7bc04215a66b60e198aecaee8418f6d79fa19faa < 123bc712b1de0805f9d683687e17b1ec2aba0b68	123bc712b1de0805f9d683687e17b1ec2aba0b68
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 4.16 < 5.15.34	5.15.34
linux	linux_kernel	>= 5.16 < 5.16.20	5.16.20
linux	linux_kernel	>= 5.17 < 5.17.3	5.17.3

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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