CVE-2025-21642

一、漏洞信息
 漏洞编号：[CVE-2025-21642](https://nvd.nist.gov/vuln/detail/CVE-2025-21642)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.1.8,6.4.0,6.6.0
 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:mptcp: sysctl: sched: avoid using current->nsproxyUsing the  net  structure via  current  is not recommended for differentreasons.First, if the goal is to use it to read or write per-netns data, this isinconsistent with how the  generic  sysctl entries are doing: directlyby only using pointers set to the table entry, e.g. table->data. Linkedto that, the per-netns data should always be obtained from the tablelinked to the netns it had been created for, which may not coincide withthe reader s or writer s netns.Another reason is that access to current->nsproxy->netns can oops ifattempted when current->nsproxy had been dropped when the current taskis exiting. This is what syzbot found, when using acct(2):  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI  KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]  CPU: 1 UID: 0 PID: 5924 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024  RIP: 0010:proc_scheduler+0xc6/0x3c0 net/mptcp/ctrl.c:125  Code: 03 42 80 3c 38 00 0f 85 fe 02 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cc 02 00 00 4d 8b 7c 24 28 48 8d 84 24 c8 00 00  RSP: 0018:ffffc900034774e8 EFLAGS: 00010206  RAX: dffffc0000000000 RBX: 1ffff9200068ee9e RCX: ffffc90003477620  RDX: 0000000000000005 RSI: ffffffff8b08f91e RDI: 0000000000000028  RBP: 0000000000000001 R08: ffffc90003477710 R09: 0000000000000040  R10: 0000000000000040 R11: 00000000726f7475 R12: 0000000000000000  R13: ffffc90003477620 R14: ffffc90003477710 R15: dffffc0000000000  FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 00007fee3cd452d8 CR3: 000000007d116000 CR4: 00000000003526f0  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400  Call Trace:   <TASK>   proc_sys_call_handler+0x403/0x5d0 fs/proc/proc_sysctl.c:601   __kernel_write_iter+0x318/0xa80 fs/read_write.c:612   __kernel_write+0xf6/0x140 fs/read_write.c:632   do_acct_process+0xcb0/0x14a0 kernel/acct.c:539   acct_pin_kill+0x2d/0x100 kernel/acct.c:192   pin_kill+0x194/0x7c0 fs/fs_pin.c:44   mnt_pin_kill+0x61/0x1e0 fs/fs_pin.c:81   cleanup_mnt+0x3ac/0x450 fs/namespace.c:1366   task_work_run+0x14e/0x250 kernel/task_work.c:239   exit_task_work include/linux/task_work.h:43 [inline]   do_exit+0xad8/0x2d70 kernel/exit.c:938   do_group_exit+0xd3/0x2a0 kernel/exit.c:1087   get_signal+0x2576/0x2610 kernel/signal.c:3017   arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337   exit_to_user_mode_loop kernel/entry/common.c:111 [inline]   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]   syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218   do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89   entry_SYSCALL_64_after_hwframe+0x77/0x7f  RIP: 0033:0x7fee3cb87a6a  Code: Unable to access opcode bytes at 0x7fee3cb87a40.  RSP: 002b:00007fffcccac688 EFLAGS: 00000202 ORIG_RAX: 0000000000000037  RAX: 0000000000000000 RBX: 00007fffcccac710 RCX: 00007fee3cb87a6a  RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003  RBP: 0000000000000003 R08: 00007fffcccac6ac R09: 00007fffcccacac7  R10: 00007fffcccac710 R11: 0000000000000202 R12: 00007fee3cd49500  R13: 00007fffcccac6ac R14: 0000000000000000 R15: 00007fee3cd4b000   </TASK>  Modules linked in:  ---[ end trace 0000000000000000 ]---  RIP: 0010:proc_scheduler+0xc6/0x3c0 net/mptcp/ctrl.c:125  Code: 03 42 80 3c 38 00 0f 85 fe 02 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc---truncated---
 漏洞公开时间：2025-01-19 19:15:09
 漏洞创建时间：2025-01-19 20:20:02
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-21642
<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/6035702381c35a8f16757332381e58b348a9eaf9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/c0e394fd6b887e84da17e38aaa6c1c104f9c86c2 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d38e26e36206ae3d544d496513212ae931d1da0a |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-21642 | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2025/CVE-2025-21642.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://git.kernel.org/stable/c/c0e394fd6b887e84da17e38aaa6c1c104f9c86c2 | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://git.kernel.org/stable/c/6035702381c35a8f16757332381e58b348a9eaf9 | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://git.kernel.org/stable/c/d38e26e36206ae3d544d496513212ae931d1da0a | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2025-21642 | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2338820 | https://bugzilla.suse.com/show_bug.cgi?id=1236572 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2025011944-CVE-2025-21642-5728@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2338820 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2025-21642 |
| mageia |  | http://advisories.mageia.org/MGASA-2025-0030.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>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| linux_kernel | 6.6.72 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c0e394fd6b887e84da17e38aaa6c1c104f9c86c2Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=daad878a509d69da1761106cb48c091dfe9d522d | linuxkernelcves |
| linux_kernel | 6.12.10 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6035702381c35a8f16757332381e58b348a9eaf9Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=daad878a509d69da1761106cb48c091dfe9d522d | linuxkernelcves |
| linux_kernel | 6.13-rc7 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d38e26e36206ae3d544d496513212ae931d1da0aIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=daad878a509d69da1761106cb48c091dfe9d522d | linuxkernelcves |

</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:mptcp: sysctl: sched: avoid using current->nsproxyUsing the  net  structure via  current  is not recommended for differentreasons.First, if the goal is to use it to read or write per-netns data, this isinconsistent with how the  generic  sysctl entries are doing: directlyby only using pointers set to the table entry, e.g. table->data. Linkedto that, the per-netns data should always be obtained from the tablelinked to the netns it had been created for, which may not coincide withthe reader s or writer s netns.Another reason is that access to current->nsproxy->netns can oops ifattempted when current->nsproxy had been dropped when the current taskis exiting. This is what syzbot found, when using acct(2):  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI  KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]  CPU: 1 UID: 0 PID: 5924 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024  RIP: 0010:proc_scheduler+0xc6/0x3c0 net/mptcp/ctrl.c:125  Code: 03 42 80 3c 38 00 0f 85 fe 02 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cc 02 00 00 4d 8b 7c 24 28 48 8d 84 24 c8 00 00  RSP: 0018:ffffc900034774e8 EFLAGS: 00010206  RAX: dffffc0000000000 RBX: 1ffff9200068ee9e RCX: ffffc90003477620  RDX: 0000000000000005 RSI: ffffffff8b08f91e RDI: 0000000000000028  RBP: 0000000000000001 R08: ffffc90003477710 R09: 0000000000000040  R10: 0000000000000040 R11: 00000000726f7475 R12: 0000000000000000  R13: ffffc90003477620 R14: ffffc90003477710 R15: dffffc0000000000  FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 00007fee3cd452d8 CR3: 000000007d116000 CR4: 00000000003526f0  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400  Call Trace:   <TASK>   proc_sys_call_handler+0x403/0x5d0 fs/proc/proc_sysctl.c:601   __kernel_write_iter+0x318/0xa80 fs/read_write.c:612   __kernel_write+0xf6/0x140 fs/read_write.c:632   do_acct_process+0xcb0/0x14a0 kernel/acct.c:539   acct_pin_kill+0x2d/0x100 kernel/acct.c:192   pin_kill+0x194/0x7c0 fs/fs_pin.c:44   mnt_pin_kill+0x61/0x1e0 fs/fs_pin.c:81   cleanup_mnt+0x3ac/0x450 fs/namespace.c:1366   task_work_run+0x14e/0x250 kernel/task_work.c:239   exit_task_work include/linux/task_work.h:43 [inline]   do_exit+0xad8/0x2d70 kernel/exit.c:938   do_group_exit+0xd3/0x2a0 kernel/exit.c:1087   get_signal+0x2576/0x2610 kernel/signal.c:3017   arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337   exit_to_user_mode_loop kernel/entry/common.c:111 [inline]   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]   syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218   do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89   entry_SYSCALL_64_after_hwframe+0x77/0x7f  RIP: 0033:0x7fee3cb87a6a  Code: Unable to access opcode bytes at 0x7fee3cb87a40.  RSP: 002b:00007fffcccac688 EFLAGS: 00000202 ORIG_RAX: 0000000000000037  RAX: 0000000000000000 RBX: 00007fffcccac710 RCX: 00007fee3cb87a6a  RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003  RBP: 0000000000000003 R08: 00007fffcccac6ac R09: 00007fffcccacac7  R10: 00007fffcccac710 R11: 0000000000000202 R12: 00007fee3cd49500  R13: 00007fffcccac6ac R14: 0000000000000000 R15: 00007fee3cd4b000   </TASK>  Modules linked in:  ---[ end trace 0000000000000000 ]---  RIP: 0010:proc_scheduler+0xc6/0x3c0 net/mptcp/ctrl.c:125  Code: 03 42 80 3c 38 00 0f 85 fe 02 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc---truncated---
 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-24.03-LTS(6.6.0):受影响
2.openEuler-24.03-LTS-SP1(6.6.0):受影响
3.openEuler-20.03-LTS-SP4(4.19.90):不受影响
4.openEuler-22.03-LTS-SP3(5.10.0):不受影响
5.openEuler-22.03-LTS-SP4:不受影响
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-SP3(5.10.0):否
3.master(6.6.0):否
4.openEuler-24.03-LTS(6.6.0):否
5.openEuler-24.03-LTS-Next(6.6.0):否
6.openEuler-22.03-LTS-SP4:否
7.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-24.03-LTS(6.6.0):正常修复
2.openEuler-24.03-LTS-SP1(6.6.0):正常修复
3.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
6.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不存在
7.openEuler-22.03-LTS-SP4:不受影响-漏洞代码不存在

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1321

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