CVE-2022-48947

Bluetooth: L2CAP: Fix u8 overflow

MEDIUM

5.5

CVSS Score

Published: October 21, 2024 at 08:05 PM UTC

Updated: June 17, 2026 at 05:16 AM UTC

1 product affected across 1 vendorLinux Kernel

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v < 4.9.3372.6.32 ≤ v < 4.14.3032.6.32 ≤ v < 4.19.2702.6.32 ≤ v < 4.9.3372.6.32 ≤ v < 5.10.1612.6.32 ≤ v < 5.15.852.6.32 ≤ v < 5.4.2292.6.32 ≤ v < 6.0.152.6.32 ≤ v < 6.14.10 ≤ v < 4.14.3034.15 ≤ v < 4.19.2704.20 ≤ v < 5.4.2295.11 ≤ v < 5.15.855.16 ≤ v < 6.0.155.5 ≤ v < 5.10.1616.1 rc1 6.1 rc2 6.1 rc3 6.1 rc4 6.1 rc5 6.1 rc6 6.1 rc7 6.1 rc8f2fcfcd670257236ebf2088bbdf26f6a8ef459fe

Vendor states this is fixed in 19a78143961a197de8502f4f29c453b913dc3c29 (fixed)

Vendor states this is fixed in 49d5867819ab7c744852b45509e8469839c07e0e (fixed)

Vendor states this is fixed in 5550bbf709c323194881737fd290c4bada9e6ead (fixed)

Vendor states this is fixed in 95f1847a361c7b4bf7d74c06ecb6968455082c1a (fixed)

Vendor states this is fixed in 9fdc79b571434af7bc742da40a3405f038b637a7 (fixed)

Vendor states this is fixed in ad528fde0702903208d0a79d88d5a42ae3fc235b (fixed)

Vendor states this is fixed in bcd70260ef56e0aee8a4fc6cd214a419900b0765 (fixed)

Vendor states this is fixed in f3fe6817156a2ad4b06f01afab04638a34d7c9a6 (fixed)

Vendor states this is fixed in 2.6.32 (unaffected)

Vendor states this is fixed in 4.14.303 (unaffected)

Vendor states this is fixed in 4.19.270 (unaffected)

Vendor states this is fixed in 4.9.337 (unaffected)