CVE-2022-48947

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < 49d5867819ab7c744852b45509e8469839c07e0eaffected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < 95f1847a361c7b4bf7d74c06ecb6968455082c1aaffected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < ad528fde0702903208d0a79d88d5a42ae3fc235baffected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < 9fdc79b571434af7bc742da40a3405f038b637a7affected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < f3fe6817156a2ad4b06f01afab04638a34d7c9a6affected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < 19a78143961a197de8502f4f29c453b913dc3c29affected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < 5550bbf709c323194881737fd290c4bada9e6eadaffected
LinuxLinuxf2fcfcd670257236ebf2088bbdf26f6a8ef459fe < bcd70260ef56e0aee8a4fc6cd214a419900b0765affected
LinuxLinux2.6.32affected
LinuxLinux0 < 2.6.32unaffected
LinuxLinux4.9.337 <= 4.9.*unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.161 <= 5.10.*unaffected
LinuxLinux5.15.85 <= 5.15.*unaffected
LinuxLinux6.0.15 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References