Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

CVE-2022-48947

Disclosure Date: October 21, 2024
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

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              ........@...

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CVSS V3 Severity and Metrics
Base Score:
5.5 Medium
Impact Score:
3.6
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Vendors

  • linux

Products

  • linux kernel,
  • linux kernel 6.1
Technical Analysis