CVE-2024-46771

一、漏洞信息
 漏洞编号：[CVE-2024-46771](https://nvd.nist.gov/vuln/detail/CVE-2024-46771)
 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:can: bcm: Remove proc entry when dev is unregistered.syzkaller reported a warning in bcm_connect() below. [0]The repro calls connect() to vxcan1, removes vxcan1, and callsconnect() with ifindex == 0.Calling connect() for a BCM socket allocates a proc entry.Then, bcm_sk(sk)->bound is set to 1 to prevent further connect().However, removing the bound device resets bcm_sk(sk)->bound to 0in bcm_notify().The 2nd connect() tries to allocate a proc entry with the samename and sets NULL to bcm_sk(sk)->bcm_proc_read, leaking theoriginal proc entry.Since the proc entry is available only for connect()ed sockets,let s clean up the entry when the bound netdev is unregistered.[0]:proc_dir_entry  can-bcm/2456  already registeredWARNING: CPU: 1 PID: 394 at fs/proc/generic.c:376 proc_register+0x645/0x8f0 fs/proc/generic.c:375Modules linked in:CPU: 1 PID: 394 Comm: syz-executor403 Not tainted 6.10.0-rc7-g852e42cc2dd4Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014RIP: 0010:proc_register+0x645/0x8f0 fs/proc/generic.c:375Code: 00 00 00 00 00 48 85 ed 0f 85 97 02 00 00 4d 85 f6 0f 85 9f 02 00 00 48 c7 c7 9b cb cf 87 48 89 de 4c 89 fa e8 1c 6f eb fe 90 <0f> 0b 90 90 48 c7 c7 98 37 99 89 e8 cb 7e 22 05 bb 00 00 00 10 48RSP: 0018:ffa0000000cd7c30 EFLAGS: 00010246RAX: 9e129be1950f0200 RBX: ff1100011b51582c RCX: ff1100011857cd80RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002RBP: 0000000000000000 R08: ffd400000000000f R09: ff1100013e78cac0R10: ffac800000cd7980 R11: ff1100013e12b1f0 R12: 0000000000000000R13: 0000000000000000 R14: 0000000000000000 R15: ff1100011a99a2ecFS:  00007fbd7086f740(0000) GS:ff1100013fd00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000200071c0 CR3: 0000000118556004 CR4: 0000000000771ef0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400PKRU: 55555554Call Trace: <TASK> proc_create_net_single+0x144/0x210 fs/proc/proc_net.c:220 bcm_connect+0x472/0x840 net/can/bcm.c:1673 __sys_connect_file net/socket.c:2049 [inline] __sys_connect+0x5d2/0x690 net/socket.c:2066 __do_sys_connect net/socket.c:2076 [inline] __se_sys_connect net/socket.c:2073 [inline] __x64_sys_connect+0x8f/0x100 net/socket.c:2073 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x4b/0x53RIP: 0033:0x7fbd708b0e5dCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48RSP: 002b:00007fff8cd33f08 EFLAGS: 00000246 ORIG_RAX: 000000000000002aRAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbd708b0e5dRDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003RBP: 0000000000000000 R08: 0000000000000040 R09: 0000000000000040R10: 0000000000000040 R11: 0000000000000246 R12: 00007fff8cd34098R13: 0000000000401280 R14: 0000000000406de8 R15: 00007fbd70ab9000 </TASK>remove_proc_entry: removing non-empty directory  net/can-bcm , leaking at least  2456 
 漏洞公开时间：2024-09-18 16:15:05
 漏洞创建时间：2024-09-19 00:45:20
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-46771
<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/10bfacbd5e8d821011d857bee73310457c9c989a |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/33ed4ba73caae39f34ab874ba79138badc2c65dd |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/3b39dc2901aa7a679a5ca981a3de9f8d5658afe8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/4377b79323df62eb5d310354f19b4d130ff58d50 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/5c680022c4e28ba18ea500f3e29f0428271afa92 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/76fe372ccb81b0c89b6cd2fec26e2f38c958be85 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/abb0a615569ec008e8a93d9f3ab2d5b418ea94d4 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/aec92dbebdbec7567d9f56d7c9296a572b8fd849 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-46771 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-46771 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/10bfacbd5e8d821011d857bee73310457c9c989a | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/33ed4ba73caae39f34ab874ba79138badc2c65dd | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/3b39dc2901aa7a679a5ca981a3de9f8d5658afe8 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/4377b79323df62eb5d310354f19b4d130ff58d50 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/5c680022c4e28ba18ea500f3e29f0428271afa92 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/76fe372ccb81b0c89b6cd2fec26e2f38c958be85 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/abb0a615569ec008e8a93d9f3ab2d5b418ea94d4 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/stable/c/aec92dbebdbec7567d9f56d7c9296a572b8fd849 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-46771.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2313119 | https://bugzilla.suse.com/show_bug.cgi?id=1230766 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-46771 |
| mageia |  | http://advisories.mageia.org/MGASA-2024-0316.html |
| amazon_linux_explore | https://access.redhat.com/security/cve/CVE-2024-46771 | https://explore.alas.aws.amazon.com/CVE-2024-46771.html |
| amazon_linux_explore | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46771 | https://explore.alas.aws.amazon.com/CVE-2024-46771.html |

</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>

无
</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:can: bcm: Remove proc entry when dev is unregistered.syzkaller reported a warning in bcm_connect() below. [0]The repro calls connect() to vxcan1, removes vxcan1, and callsconnect() with ifindex == 0.Calling connect() for a BCM socket allocates a proc entry.Then, bcm_sk(sk)-&gt;bound is set to 1 to prevent further connect().However, removing the bound device resets bcm_sk(sk)-&gt;bound to 0in bcm_notify().The 2nd connect() tries to allocate a proc entry with the samename and sets NULL to bcm_sk(sk)-&gt;bcm_proc_read, leaking theoriginal proc entry.Since the proc entry is available only for connect()ed sockets,let&#39;s clean up the entry when the bound netdev is unregistered.[0]:proc_dir_entry &#39;can-bcm/2456&#39; already registeredWARNING: CPU: 1 PID: 394 at fs/proc/generic.c:376 proc_register+0x645/0x8f0 fs/proc/generic.c:375Modules linked in:CPU: 1 PID: 394 Comm: syz-executor403 Not tainted 6.10.0-rc7-g852e42cc2dd4Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014RIP: 0010:proc_register+0x645/0x8f0 fs/proc/generic.c:375Code: 00 00 00 00 00 48 85 ed 0f 85 97 02 00 00 4d 85 f6 0f 85 9f 02 00 00 48 c7 c7 9b cb cf 87 48 89 de 4c 89 fa e8 1c 6f eb fe 90 &lt;0f&gt; 0b 90 90 48 c7 c7 98 37 99 89 e8 cb 7e 22 05 bb 00 00 00 10 48RSP: 0018:ffa0000000cd7c30 EFLAGS: 00010246RAX: 9e129be1950f0200 RBX: ff1100011b51582c RCX: ff1100011857cd80RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002RBP: 0000000000000000 R08: ffd400000000000f R09: ff1100013e78cac0R10: ffac800000cd7980 R11: ff1100013e12b1f0 R12: 0000000000000000R13: 0000000000000000 R14: 0000000000000000 R15: ff1100011a99a2ecFS:  00007fbd7086f740(0000) GS:ff1100013fd00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00000000200071c0 CR3: 0000000118556004 CR4: 0000000000771ef0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400PKRU: 55555554Call Trace: &lt;TASK&gt; proc_create_net_single+0x144/0x210 fs/proc/proc_net.c:220 bcm_connect+0x472/0x840 net/can/bcm.c:1673 __sys_connect_file net/socket.c:2049 [inline] __sys_connect+0x5d2/0x690 net/socket.c:2066 __do_sys_connect net/socket.c:2076 [inline] __se_sys_connect net/socket.c:2073 [inline] __x64_sys_connect+0x8f/0x100 net/socket.c:2073 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x4b/0x53RIP: 0033:0x7fbd708b0e5dCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 &lt;48&gt; 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48RSP: 002b:00007fff8cd33f08 EFLAGS: 00000246 ORIG_RAX: 000000000000002aRAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbd708b0e5dRDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003RBP: 0000000000000000 R08: 0000000000000040 R09: 0000000000000040R10: 0000000000000040 R11: 0000000000000246 R12: 00007fff8cd34098R13: 0000000000401280 R14: 0000000000406de8 R15: 00007fbd70ab9000 &lt;/TASK&gt;remove_proc_entry: removing non-empty directory &#39;net/can-bcm&#39;, leaking at least &#39;2456&#39;The Linux kernel CVE team has assigned CVE-2024-46771 to this issue.            
 openEuler评分：
  5.5
 Vector：CVSS：2.0/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-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):受影响
3.openEuler-22.03-LTS-SP3(5.10.0):受影响
4.openEuler-22.03-LTS-SP4(5.10.0):受影响
5.openEuler-24.03-LTS(6.6.0):受影响
6.master(6.6.0):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(6.6.0):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

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-2220

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