CVE-2024-36968 (GCVE-0-2024-36968)

Vulnerability from cvelistv5 – Published: 2024-06-08 12:53 – Updated: 2025-05-04 09:13
VLAI?
Title
Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()
Summary
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 <66> 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: <TASK> 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 net/bluetooth/hci_core.c:3939 [inline] hci_rx_work+0x5e5/0xb20 net/bluetooth/hci_core.c:4176 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x90f/0x1530 kernel/workqueue.c:3335 worker_thread+0x926/0xe70 kernel/workqueue.c:3416 kthread+0x2e3/0x380 kernel/kthread.c:388 ret_from_fork+0x5c/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf , < ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674 (git)
Affected: 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf , < dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3 (git)
Affected: 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf , < d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30 (git)
Affected: 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf , < 4d3dbaa252257d20611c3647290e6171f1bbd6c8 (git)
Affected: 6ed58ec520ad2b2fe3f955c8a5fd0eecafccebdf , < a5b862c6a221459d54e494e88965b48dcfa6cc44 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 6.6.32 , ≤ 6.6.* (semver)
Unaffected: 6.8.11 , ≤ 6.8.* (semver)
Unaffected: 6.9.2 , ≤ 6.9.* (semver)
Unaffected: 6.9.4 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"lessThan\": \"2.6.39\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.32\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/bluetooth/hci.h\", \"include/net/bluetooth/hci_core.h\", \"net/bluetooth/hci_conn.c\", \"net/bluetooth/hci_event.c\", \"net/bluetooth/iso.c\", \"net/bluetooth/l2cap_core.c\", \"net/bluetooth/sco.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674\"}, {\"url\": \"https://git.kernel.org/stable/c/dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3\"}, {\"url\": \"https://git.kernel.org/stable/c/d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30\"}, {\"url\": \"https://git.kernel.org/stable/c/4d3dbaa252257d20611c3647290e6171f1bbd6c8\"}, {\"url\": \"https://git.kernel.org/stable/c/a5b862c6a221459d54e494e88965b48dcfa6cc44\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()\\n\\nl2cap_le_flowctl_init() can cause both div-by-zero and an integer\\noverflow since hdev-\u003ele_mtu may not fall in the valid range.\\n\\nMove MTU from hci_dev to hci_conn to validate MTU and stop the connection\\nprocess earlier if MTU is invalid.\\nAlso, add a missing validation in read_buffer_size() and make it return\\nan error value if the validation fails.\\nNow hci_conn_add() returns ERR_PTR() as it can fail due to the both a\\nkzalloc failure and invalid MTU value.\\n\\ndivide error: 0000 [#1] PREEMPT SMP KASAN NOPTI\\nCPU: 0 PID: 67 Comm: kworker/u5:0 Tainted: G        W          6.9.0-rc5+ #20\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\\nWorkqueue: hci0 hci_rx_work\\nRIP: 0010:l2cap_le_flowctl_init+0x19e/0x3f0 net/bluetooth/l2cap_core.c:547\\nCode: 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\\n89 fe 4c 89 e2 89 d9 e8 27 17 0c 00 44 89 f0 31 d2 \u003c66\u003e f7 f3 89 c3 ff c3 4d 8d\\nb7 88 00 00 00 4c 89 f0 48 c1 e8 03 42\\nRSP: 0018:ffff88810bc0f858 EFLAGS: 00010246\\nRAX: 00000000000002a0 RBX: 0000000000000000 RCX: dffffc0000000000\\nRDX: 0000000000000000 RSI: ffff88810bc0f7c0 RDI: ffffc90002dcb66f\\nRBP: ffff88810bc0f880 R08: aa69db2dda70ff01 R09: 0000ffaaaaaaaaaa\\nR10: 0084000000ffaaaa R11: 0000000000000000 R12: ffff88810d65a084\\nR13: dffffc0000000000 R14: 00000000000002a0 R15: ffff88810d65a000\\nFS:  0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000000020000100 CR3: 0000000103268003 CR4: 0000000000770ef0\\nPKRU: 55555554\\nCall Trace:\\n \u003cTASK\u003e\\n l2cap_le_connect_req net/bluetooth/l2cap_core.c:4902 [inline]\\n l2cap_le_sig_cmd net/bluetooth/l2cap_core.c:5420 [inline]\\n l2cap_le_sig_channel net/bluetooth/l2cap_core.c:5486 [inline]\\n l2cap_recv_frame+0xe59d/0x11710 net/bluetooth/l2cap_core.c:6809\\n l2cap_recv_acldata+0x544/0x10a0 net/bluetooth/l2cap_core.c:7506\\n hci_acldata_packet net/bluetooth/hci_core.c:3939 [inline]\\n hci_rx_work+0x5e5/0xb20 net/bluetooth/hci_core.c:4176\\n process_one_work kernel/workqueue.c:3254 [inline]\\n process_scheduled_works+0x90f/0x1530 kernel/workqueue.c:3335\\n worker_thread+0x926/0xe70 kernel/workqueue.c:3416\\n kthread+0x2e3/0x380 kernel/kthread.c:388\\n ret_from_fork+0x5c/0x90 arch/x86/kernel/process.c:147\\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\\n \u003c/TASK\u003e\\nModules linked in:\\n---[ end trace 0000000000000000 ]---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.32\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.11\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.2\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"2.6.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"2.6.39\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:13:03.181Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36968\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:13:03.181Z\", \"dateReserved\": \"2024-05-30T15:25:07.081Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-08T12:53:00.562Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.