CVE-2024-36968

一、漏洞信息
 漏洞编号：[CVE-2024-36968](https://nvd.nist.gov/vuln/detail/CVE-2024-36968)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V2.0分值：
  BaseScore：0.0 None
  Vector：CVSS：2.0/
 漏洞简述：
  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 integeroverflow 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 connectionprocess earlier if MTU is invalid.Also, add a missing validation in read_buffer_size() and make it returnan error value if the validation fails.Now hci_conn_add() returns ERR_PTR() as it can fail due to the both akzalloc failure and invalid MTU value.divide error: 0000 [#1] PREEMPT SMP KASAN NOPTICPU: 0 PID: 67 Comm: kworker/u5:0 Tainted: G        W          6.9.0-rc5+ #20Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014Workqueue: hci0 hci_rx_workRIP: 0010:l2cap_le_flowctl_init+0x19e/0x3f0 net/bluetooth/l2cap_core.c:547Code: e8 17 17 0c 00 66 41 89 9f 84 00 00 00 bf 01 00 00 00 41 b8 02 00 00 00 4c89 fe 4c 89 e2 89 d9 e8 27 17 0c 00 44 89 f0 31 d2 <66> f7 f3 89 c3 ff c3 4d 8db7 88 00 00 00 4c 89 f0 48 c1 e8 03 42RSP: 0018:ffff88810bc0f858 EFLAGS: 00010246RAX: 00000000000002a0 RBX: 0000000000000000 RCX: dffffc0000000000RDX: 0000000000000000 RSI: ffff88810bc0f7c0 RDI: ffffc90002dcb66fRBP: ffff88810bc0f880 R08: aa69db2dda70ff01 R09: 0000ffaaaaaaaaaaR10: 0084000000ffaaaa R11: 0000000000000000 R12: ffff88810d65a084R13: dffffc0000000000 R14: 00000000000002a0 R15: ffff88810d65a000FS:  0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000000020000100 CR3: 0000000103268003 CR4: 0000000000770ef0PKRU: 55555554Call 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 ]---
 漏洞公开时间：2024-06-08 21:15:58
 漏洞创建时间：2024-06-08 22:22:14
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-36968
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/4d3dbaa252257d20611c3647290e6171f1bbd6c8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/a5b862c6a221459d54e494e88965b48dcfa6cc44 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36968 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-36968 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://git.kernel.org/stable/c/a5b862c6a221459d54e494e88965b48dcfa6cc44 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://git.kernel.org/stable/c/ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://git.kernel.org/stable/c/d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://git.kernel.org/stable/c/dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3 | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36968.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1226130 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024060804-CVE-2024-36968-6d78@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2292324 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-36968 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://git.kernel.org/linus/a5b862c6a221459d54e494e88965b48dcfa6cc44 (6.10-rc1) | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://git.kernel.org/stable/c/ad3f7986c5a0f82b8b66a0afe1cc1f5421e1d674 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://git.kernel.org/stable/c/dfece2b4e3759759b2bdfac2cd6d0ee9fbf055f3 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://git.kernel.org/stable/c/d2b2f7d3936dc5990549bc36ab7ac7ac37f22c30 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://git.kernel.org/stable/c/a5b862c6a221459d54e494e88965b48dcfa6cc44 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-36968 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-36968 | https://ubuntu.com/security/CVE-2024-36968 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-36968 | https://ubuntu.com/security/CVE-2024-36968 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-36968 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/a5b862c6a221459d54e494e88965b48dcfa6cc44 | https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  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 integeroverflow 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 connectionprocess earlier if MTU is invalid.Also, add a missing validation in read_buffer_size() and make it returnan error value if the validation fails.Now hci_conn_add() returns ERR_PTR() as it can fail due to the both akzalloc failure and invalid MTU value.divide error: 0000 [#1] PREEMPT SMP KASAN NOPTICPU: 0 PID: 67 Comm: kworker/u5:0 Tainted: G        W          6.9.0-rc5+ #20Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014Workqueue: hci0 hci_rx_workRIP: 0010:l2cap_le_flowctl_init+0x19e/0x3f0 net/bluetooth/l2cap_core.c:547Code: e8 17 17 0c 00 66 41 89 9f 84 00 00 00 bf 01 00 00 00 41 b8 02 00 00 00 4c89 fe 4c 89 e2 89 d9 e8 27 17 0c 00 44 89 f0 31 d2 <66> f7 f3 89 c3 ff c3 4d 8db7 88 00 00 00 4c 89 f0 48 c1 e8 03 42RSP: 0018:ffff88810bc0f858 EFLAGS: 00010246RAX: 00000000000002a0 RBX: 0000000000000000 RCX: dffffc0000000000RDX: 0000000000000000 RSI: ffff88810bc0f7c0 RDI: ffffc90002dcb66fRBP: ffff88810bc0f880 R08: aa69db2dda70ff01 R09: 0000ffaaaaaaaaaaR10: 0084000000ffaaaa R11: 0000000000000000 R12: ffff88810d65a084R13: dffffc0000000000 R14: 00000000000002a0 R15: ffff88810d65a000FS:  0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000000020000100 CR3: 0000000103268003 CR4: 0000000000770ef0PKRU: 55555554Call 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 ]---
 openEuler评分：
  5.5
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-22.03-LTS-SP1(5.10.0):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-24.03-LTS(6.6.0):受影响
4.openEuler-20.03-LTS-SP4(4.19.90):不受影响
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响
6.master(6.1.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master(6.1.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否

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