Vulnerability CVE-2022-48947
Published: 2024-10-21

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

Bluetooth: L2CAP: Fix u8 overflow

By keep sending L2CAP_CONF_REQ packets, chan->num_conf_rsp increases
multiple times and eventually it will wrap around the maximum number
(i.e., 255).
This patch prevents this by adding a boundary check with
L2CAP_MAX_CONF_RSP

Btmon log:
Bluetooth monitor ver 5.64
= Note: Linux version 6.1.0-rc2 (x86_64) 0.264594
= Note: Bluetooth subsystem version 2.22 0.264636
@ MGMT Open: btmon (privileged) version 1.22 {0x0001} 0.272191
= New Index: 00:00:00:00:00:00 (Primary,Virtual,hci0) [hci0] 13.877604
@ RAW Open: 9496 (privileged) version 2.22 {0x0002} 13.890741
= Open Index: 00:00:00:00:00:00 [hci0] 13.900426
(...)
> ACL Data RX: Handle 200 flags 0x00 dlen 1033 #32 [hci0] 14.273106
invalid packet size (12 != 1033)
08 00 01 00 02 01 04 00 01 10 ff ff ............
> ACL Data RX: Handle 200 flags 0x00 dlen 1547 #33 [hci0] 14.273561
invalid packet size (14 != 1547)
0a 00 01 00 04 01 06 00 40 00 00 00 00 00 ........@.....
> ACL Data RX: Handle 200 flags 0x00 dlen 2061 #34 [hci0] 14.274390
invalid packet size (16 != 2061)
0c 00 01 00 04 01 08 00 40 00 00 00 00 00 00 04 ........@.......
> ACL Data RX: Handle 200 flags 0x00 dlen 2061 #35 [hci0] 14.274932
invalid packet size (16 != 2061)
0c 00 01 00 04 01 08 00 40 00 00 00 07 00 03 00 ........@.......
= bluetoothd: Bluetooth daemon 5.43 14.401828
> ACL Data RX: Handle 200 flags 0x00 dlen 1033 #36 [hci0] 14.275753
invalid packet size (12 != 1033)
08 00 01 00 04 01 04 00 40 00 00 00 ........@...

 References:
https://git.kernel.org/stable/c/49d5867819ab7c744852b45509e8469839c07e0e
https://git.kernel.org/stable/c/95f1847a361c7b4bf7d74c06ecb6968455082c1a
https://git.kernel.org/stable/c/ad528fde0702903208d0a79d88d5a42ae3fc235b
https://git.kernel.org/stable/c/9fdc79b571434af7bc742da40a3405f038b637a7
https://git.kernel.org/stable/c/f3fe6817156a2ad4b06f01afab04638a34d7c9a6
https://git.kernel.org/stable/c/19a78143961a197de8502f4f29c453b913dc3c29
https://git.kernel.org/stable/c/5550bbf709c323194881737fd290c4bada9e6ead
https://git.kernel.org/stable/c/bcd70260ef56e0aee8a4fc6cd214a419900b0765
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