CVE-2022-48970

一、漏洞信息
 漏洞编号：[CVE-2022-48970](https://nvd.nist.gov/vuln/detail/CVE-2022-48970)
 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 V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:af_unix: Get user_ns from in_skb in unix_diag_get_exact().Wei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosedthe root cause: in unix_diag_get_exact(), the newly allocated skb does nothave sk. [2]We must get the user_ns from the NETLINK_CB(in_skb).sk and pass it tosk_diag_fill().[0]:BUG: kernel NULL pointer dereference, address: 0000000000000270#PF: supervisor read access in kernel mode#PF: error_code(0x0000) - not-present pagePGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0Oops: 0000 [#1] PREEMPT SMPCPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOSrel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014RIP: 0010:sk_user_ns include/net/sock.h:920 [inline]RIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline]RIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170Code: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e854 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd <48> 8b9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8dRSP: 0018:ffffc90000d67968 EFLAGS: 00010246RAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481dRDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270RBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000R10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800R13: ffff88812c87c400 R14: ffff88812ae42210 R15: ffff888103026940FS:  00007f08b4e6f700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000000000000270 CR3: 000000012c58b000 CR4: 00000000003506f0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400Call Trace: <TASK> unix_diag_get_exact net/unix/diag.c:285 [inline] unix_diag_handler_dump+0x3f9/0x500 net/unix/diag.c:317 __sock_diag_cmd net/core/sock_diag.c:235 [inline] sock_diag_rcv_msg+0x237/0x250 net/core/sock_diag.c:266 netlink_rcv_skb+0x13e/0x250 net/netlink/af_netlink.c:2564 sock_diag_rcv+0x24/0x40 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x38f/0x500 net/socket.c:2476 ___sys_sendmsg net/socket.c:2530 [inline] __sys_sendmsg+0x197/0x230 net/socket.c:2559 __do_sys_sendmsg net/socket.c:2568 [inline] __se_sys_sendmsg net/socket.c:2566 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcdRIP: 0033:0x4697f9Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 4889 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48RSP: 002b:00007f08b4e6ec48 EFLAGS: 00000246 ORIG_RAX: 000000000000002eRAX: ffffffffffffffda RBX: 000000000077bf80 RCX: 00000000004697f9RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003RBP: 00000000004d29e9 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000246 R12: 000000000077bf80R13: 0000000000000000 R14: 000000000077bf80 R15: 00007ffdb36bc6c0 </TASK>Modules linked in:CR2: 0000000000000270[1]: https://lore.kernel.org/netdev/CAO4mrfdvyjFpokhNsiwZiP-wpdSD0AStcJwfKcKQdAALQ9_2Qw@mail.gmail.com/[2]: https://lore.kernel.org/netdev/e04315e7c90d9a75613f3993c2baf2d344eef7eb.camel@redhat.com/
 漏洞公开时间：2024-10-22 04:15:09
 漏洞创建时间：2024-10-22 08:02:11
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-48970
<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/575a6266f63dbb3b8eb1da03671451f0d81b8034 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/5c014eb0ed6c8c57f483e94cc6e90f34ce426d91 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/9c1d6f79a2c7b8221dcec27defc6dc461052ead4 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b3abe42e94900bdd045c472f9c9be620ba5ce553 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/c66d78aee55dab72c92020ebfbebc464d4f5dd2a |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48970 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2022-48970 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/stable/c/575a6266f63dbb3b8eb1da03671451f0d81b8034 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/stable/c/5c014eb0ed6c8c57f483e94cc6e90f34ce426d91 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/stable/c/9c1d6f79a2c7b8221dcec27defc6dc461052ead4 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/stable/c/b3abe42e94900bdd045c472f9c9be620ba5ce553 | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/stable/c/c66d78aee55dab72c92020ebfbebc464d4f5dd2a | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48970.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1231887 |

</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  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/stable/c/575a6266f63dbb3b8eb1da03671451f0d81b8034 |  | nvd |
|  |  | https://git.kernel.org/stable/c/5c014eb0ed6c8c57f483e94cc6e90f34ce426d91 |  | nvd |
|  |  | https://git.kernel.org/stable/c/9c1d6f79a2c7b8221dcec27defc6dc461052ead4 |  | nvd |
|  |  | https://git.kernel.org/stable/c/b3abe42e94900bdd045c472f9c9be620ba5ce553 |  | nvd |
|  |  | https://git.kernel.org/stable/c/c66d78aee55dab72c92020ebfbebc464d4f5dd2a |  | nvd |

</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:af_unix: Get user_ns from in_skb in unix_diag_get_exact().Wei Chen reported a NULL deref in sk_user_ns() [0][1], and Paolo diagnosedthe root cause: in unix_diag_get_exact(), the newly allocated skb does nothave sk. [2]We must get the user_ns from the NETLINK_CB(in_skb).sk and pass it tosk_diag_fill().[0]:BUG: kernel NULL pointer dereference, address: 0000000000000270#PF: supervisor read access in kernel mode#PF: error_code(0x0000) - not-present pagePGD 12bbce067 P4D 12bbce067 PUD 12bc40067 PMD 0Oops: 0000 [#1] PREEMPT SMPCPU: 0 PID: 27942 Comm: syz-executor.0 Not tainted 6.1.0-rc5-next-20221118 #2Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOSrel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014RIP: 0010:sk_user_ns include/net/sock.h:920 [inline]RIP: 0010:sk_diag_dump_uid net/unix/diag.c:119 [inline]RIP: 0010:sk_diag_fill+0x77d/0x890 net/unix/diag.c:170Code: 89 ef e8 66 d4 2d fd c7 44 24 40 00 00 00 00 49 8d 7c 24 18 e854 d7 2d fd 49 8b 5c 24 18 48 8d bb 70 02 00 00 e8 43 d7 2d fd <48> 8b9b 70 02 00 00 48 8d 7b 10 e8 33 d7 2d fd 48 8b 5b 10 48 8dRSP: 0018:ffffc90000d67968 EFLAGS: 00010246RAX: ffff88812badaa48 RBX: 0000000000000000 RCX: ffffffff840d481dRDX: 0000000000000465 RSI: 0000000000000000 RDI: 0000000000000270RBP: ffffc90000d679a8 R08: 0000000000000277 R09: 0000000000000000R10: 0001ffffffffffff R11: 0001c90000d679a8 R12: ffff88812ac03800R13: ffff88812c87c400 R14: ffff88812ae42210 R15: ffff888103026940FS:  00007f08b4e6f700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000000000000270 CR3: 000000012c58b000 CR4: 00000000003506f0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400Call Trace: <TASK> unix_diag_get_exact net/unix/diag.c:285 [inline] unix_diag_handler_dump+0x3f9/0x500 net/unix/diag.c:317 __sock_diag_cmd net/core/sock_diag.c:235 [inline] sock_diag_rcv_msg+0x237/0x250 net/core/sock_diag.c:266 netlink_rcv_skb+0x13e/0x250 net/netlink/af_netlink.c:2564 sock_diag_rcv+0x24/0x40 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x38f/0x500 net/socket.c:2476 ___sys_sendmsg net/socket.c:2530 [inline] __sys_sendmsg+0x197/0x230 net/socket.c:2559 __do_sys_sendmsg net/socket.c:2568 [inline] __se_sys_sendmsg net/socket.c:2566 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcdRIP: 0033:0x4697f9Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 4889 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48RSP: 002b:00007f08b4e6ec48 EFLAGS: 00000246 ORIG_RAX: 000000000000002eRAX: ffffffffffffffda RBX: 000000000077bf80 RCX: 00000000004697f9RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003RBP: 00000000004d29e9 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000246 R12: 000000000077bf80R13: 0000000000000000 R14: 000000000077bf80 R15: 00007ffdb36bc6c0 </TASK>Modules linked in:CR2: 0000000000000270[1]: https://lore.kernel.org/netdev/CAO4mrfdvyjFpokhNsiwZiP-wpdSD0AStcJwfKcKQdAALQ9_2Qw@mail.gmail.com/[2]: https://lore.kernel.org/netdev/e04315e7c90d9a75613f3993c2baf2d344eef7eb.camel@redhat.com/
 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-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.master(6.6.0):不受影响
6.openEuler-24.03-LTS(6.6.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响
8.openEuler-24.03-LTS-SP1: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
8.openEuler-24.03-LTS-SP1:否

原因说明：
  1.openEuler-22.03-LTS-SP1(5.10.0):暂不修复-漏洞仍在分析中
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不存在
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不存在
5.master(6.6.0):不受影响-漏洞代码不存在
6.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不存在
8.openEuler-24.03-LTS-SP1:不受影响-漏洞代码不存在

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