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 •
CVE-2022-48947 CVSS v3 Base Score: 5.5
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

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 49d5867819ab
Linux not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • linux

Products

  • linux kernel,
  • linux kernel 6.1
Technical Analysis