cbcvebase.
CVE-2024-36968
published 2024-06-08

CVE-2024-36968: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init() l2cap_le_flowctl_init() can…

PriorityP424medium6.5CVSS 3.1
AVLACLPRLUINSCCNINAH
EPSS
0.21%
11.9th percentile
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init() l2cap_le_flowctl_init() can cause both div-by-zero and an integer overflow since hdev->le_mtu may not fall in the valid range. Move MTU from hci_dev to hci_conn to validate MTU and stop the connection process earlier if MTU is invalid. Also, add a missing validation in read_buffer_size() and make it return an error value if the validation fails. Now hci_conn_add() returns ERR_PTR() as it can fail due to the both a kzalloc failure and invalid MTU value. divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 PID: 67 Comm: kworker/u5:0 Tainted: G W 6.9.0-rc5+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: hci0 hci_rx_work RIP: 0010:l2cap_le_flowctl_init+0x19e/0x3f0 net/bluetooth/l2cap_core.c:547 Code: e8 17 17 0c 00 66 41 89 9f 84 00 00 00 bf 01 00 00 00 41 b8 02 00 00 00 4c 89 fe 4c 89 e2 89 d9 e8 27 17 0c 00 44 89 f0 31 d2 f7 f3 89 c3 ff c3 4d 8d b7 88 00 00 00 4c 89 f0 48 c1 e8 03 42 RSP: 0018:ffff88810bc0f858 EFLAGS: 00010246 RAX: 00000000000002a0 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffff88810bc0f7c0 RDI: ffffc90002dcb66f RBP: ffff88810bc0f880 R08: aa69db2dda70ff01 R09: 0000ffaaaaaaaaaa R10: 0084000000ffaaaa R11: 0000000000000000 R12: ffff88810d65a084 R13: dffffc0000000000 R14: 00000000000002a0 R15: ffff88810d65a000 FS: 0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000100 CR3: 0000000103268003 CR4: 0000000000770ef0 PKRU: 55555554 Call Trace: l2cap_le_connect_req net/bluetooth/l2cap_core.c:4902 [inline] l2cap_le_sig_cmd net/bluetooth/l2cap_core.c:5420 [inline] l2cap_le_sig_channel net/bluetooth/l2cap_core.c:5486 [inline] l2cap_recv_frame+0xe59d/0x11710 net/bluetooth/l2cap_core.c:6809 l2cap_recv_acldata+0x544/0x10a0 net/bluetooth/l2cap_core.c:7506 hci_acldata_packet

Affected

24 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.8.11-1 (forky)linux 6.8.11-1 (forky)
linuxlinux
linuxlinux>= 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf < ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674
linuxlinux>= 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf < dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3
linuxlinux>= 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf < d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30
linuxlinux>= 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf < 4d3dbaa252257d20611c3647290e6171f1bbd6c84d3dbaa252257d20611c3647290e6171f1bbd6c8
linuxlinux>= 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf < a5b862c6a221459d54e494e88965b48dcfa6cc44a5b862c6a221459d54e494e88965b48dcfa6cc44
linuxlinux_kernel>= 0 < 6.8.11-16.8.11-1
linuxlinux_kernel>= 0 < 6.8.11-16.8.11-1
linuxlinux_kernel>= 0 < 5.4.0-202.2225.4.0-202.222
linuxlinux_kernel>= 0 < 5.15.0-127.1375.15.0-127.137
linuxlinux_kernel>= 0 < 6.8.0-40.406.8.0-40.40
linuxlinux_kernel>= 0 < 4.4.0-262.2964.4.0-262.296
linuxlinux_kernel>= 0 < 4.15.0-232.2444.15.0-232.244
linuxlinux_kernel>= 2.6.39 < 6.6.326.6.32
linuxlinux_kernel>= 6.7 < 6.8.116.8.11
linuxlinux_kernel>= 6.9 < 6.9.26.9.2
msrcazl3_kernel_6.6.22.1-2_on_azure_linux_3.0
msrcazl3_kernel_6.6.35.1-5_on_azure_linux_3.0
msrcazure_linux_3.0_arm
msrcazure_linux_3.0_x64
msrccbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0
msrccbl2_kernel_5.15.200.1-1_on_cbl_mariner_2.0
msrccbl2_kernel_5.15.202.1-1_on_cbl_mariner_2.0

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian6.5MEDIUM
vendor_msrc6.5MEDIUM
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.