CVE-2025-21634

一、漏洞信息
 漏洞编号：[CVE-2025-21634](https://nvd.nist.gov/vuln/detail/CVE-2025-21634)
 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:cgroup/cpuset: remove kernfs active breakA warning was found:WARNING: CPU: 10 PID: 3486953 at fs/kernfs/file.c:828CPU: 10 PID: 3486953 Comm: rmdir Kdump: loaded Tainted: GRIP: 0010:kernfs_should_drain_open_files+0x1a1/0x1b0RSP: 0018:ffff8881107ef9e0 EFLAGS: 00010202RAX: 0000000080000002 RBX: ffff888154738c00 RCX: dffffc0000000000RDX: 0000000000000007 RSI: 0000000000000004 RDI: ffff888154738c04RBP: ffff888154738c04 R08: ffffffffaf27fa15 R09: ffffed102a8e7180R10: ffff888154738c07 R11: 0000000000000000 R12: ffff888154738c08R13: ffff888750f8c000 R14: ffff888750f8c0e8 R15: ffff888154738ca0FS:  00007f84cd0be740(0000) GS:ffff8887ddc00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000555f9fbe00c8 CR3: 0000000153eec001 CR4: 0000000000370ee0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400Call Trace: kernfs_drain+0x15e/0x2f0 __kernfs_remove+0x165/0x300 kernfs_remove_by_name_ns+0x7b/0xc0 cgroup_rm_file+0x154/0x1c0 cgroup_addrm_files+0x1c2/0x1f0 css_clear_dir+0x77/0x110 kill_css+0x4c/0x1b0 cgroup_destroy_locked+0x194/0x380 cgroup_rmdir+0x2a/0x140It can be explained by:rmdir 				echo 1 > cpuset.cpus				kernfs_fop_write_iter // active=0cgroup_rm_filekernfs_remove_by_name_ns	kernfs_get_active // active=1__kernfs_remove					  // active=0x80000002kernfs_drain			cpuset_write_resmaskwait_event//waiting (active == 0x80000001)				kernfs_break_active_protection				// active = 0x80000001// continue				kernfs_unbreak_active_protection				// active = 0x80000002...kernfs_should_drain_open_files// warning occurs				kernfs_put_activeThis warning is caused by  kernfs_break_active_protection  when it iswriting to cpuset.cpus, and the cgroup is removed concurrently.The commit 3a5a6d0c2b03 ( cpuset: don t nest cgroup_mutex insideget_online_cpus() ) made cpuset_hotplug_workfn asynchronous, This changeinvolves calling flush_work(), which can create a multiple processescircular locking dependency that involve cgroup_mutex, potentially leadingto a deadlock. To avoid deadlock. the commit 76bb5ab8f6e3 ( cpuset: breakkernfs active protection in cpuset_write_resmask() ) added kernfs_break_active_protection  in the cpuset_write_resmask. This couldlead to this warning.After the commit 2125c0034c5d ( cgroup/cpuset: Make cpuset hotplugprocessing synchronous ), the cpuset_write_resmask no longer needs towait the hotplug to finish, which means that concurrent hotplug and cpusetoperations are no longer possible. Therefore, the deadlock doesn t existanymore and it does not have to  break active protection  now. To fix thiswarning, just remove kernfs_break_active_protection operation in the cpuset_write_resmask .
 漏洞公开时间：2025-01-19 19:15:08
 漏洞创建时间：2025-01-19 20:33:54
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2025-21634
<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/11cb1d643a74665a4e14749414f48f82cbc15c64 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/3cb97a927fffe443e1e7e8eddbfebfdb062e86ed |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-21634 | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2025/CVE-2025-21634.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| suse_bugzilla | https://git.kernel.org/stable/c/11cb1d643a74665a4e14749414f48f82cbc15c64 | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| suse_bugzilla | https://git.kernel.org/stable/c/3cb97a927fffe443e1e7e8eddbfebfdb062e86ed | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2025-21634 | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2338822 | https://bugzilla.suse.com/show_bug.cgi?id=1236110 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2025011942-CVE-2025-21634-011f@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2338822 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2025-21634 |

</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/11cb1d643a74665a4e14749414f48f82cbc15c64 |  | nvd |
|  |  | https://git.kernel.org/stable/c/3cb97a927fffe443e1e7e8eddbfebfdb062e86ed |  | nvd |
| linux_kernel | 6.12.10 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=11cb1d643a74665a4e14749414f48f82cbc15c64Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=76bb5ab8f6e3e7bebdcefec4146ff305e7d0b465 | linuxkernelcves |
| linux_kernel | 6.13-rc7 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3cb97a927fffe443e1e7e8eddbfebfdb062e86edPlease | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=76bb5ab8f6e3e7bebdcefec4146ff305e7d0b465 | 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:cgroup/cpuset: remove kernfs active breakA warning was found:WARNING: CPU: 10 PID: 3486953 at fs/kernfs/file.c:828CPU: 10 PID: 3486953 Comm: rmdir Kdump: loaded Tainted: GRIP: 0010:kernfs_should_drain_open_files+0x1a1/0x1b0RSP: 0018:ffff8881107ef9e0 EFLAGS: 00010202RAX: 0000000080000002 RBX: ffff888154738c00 RCX: dffffc0000000000RDX: 0000000000000007 RSI: 0000000000000004 RDI: ffff888154738c04RBP: ffff888154738c04 R08: ffffffffaf27fa15 R09: ffffed102a8e7180R10: ffff888154738c07 R11: 0000000000000000 R12: ffff888154738c08R13: ffff888750f8c000 R14: ffff888750f8c0e8 R15: ffff888154738ca0FS:  00007f84cd0be740(0000) GS:ffff8887ddc00000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 0000555f9fbe00c8 CR3: 0000000153eec001 CR4: 0000000000370ee0DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400Call Trace: kernfs_drain+0x15e/0x2f0 __kernfs_remove+0x165/0x300 kernfs_remove_by_name_ns+0x7b/0xc0 cgroup_rm_file+0x154/0x1c0 cgroup_addrm_files+0x1c2/0x1f0 css_clear_dir+0x77/0x110 kill_css+0x4c/0x1b0 cgroup_destroy_locked+0x194/0x380 cgroup_rmdir+0x2a/0x140It can be explained by:rmdir echo 1 > cpuset.cpuskernfs_fop_write_iter // active=0cgroup_rm_filekernfs_remove_by_name_nskernfs_get_active // active=1__kernfs_remove  // active=0x80000002kernfs_draincpuset_write_resmaskwait_event//waiting (active == 0x80000001)kernfs_break_active_protection// active = 0x80000001// continuekernfs_unbreak_active_protection// active = 0x80000002...kernfs_should_drain_open_files// warning occurskernfs_put_activeThis warning is caused by  kernfs_break_active_protection  when it iswriting to cpuset.cpus, and the cgroup is removed concurrently.The commit 3a5a6d0c2b03 ( cpuset: don t nest cgroup_mutex insideget_online_cpus() ) made cpuset_hotplug_workfn asynchronous, This changeinvolves calling flush_work(), which can create a multiple processescircular locking dependency that involve cgroup_mutex, potentially leadingto a deadlock. To avoid deadlock. the commit 76bb5ab8f6e3 ( cpuset: breakkernfs active protection in cpuset_write_resmask() ) added kernfs_break_active_protection  in the cpuset_write_resmask. This couldlead to this warning.After the commit 2125c0034c5d ( cgroup/cpuset: Make cpuset hotplugprocessing synchronous ), the cpuset_write_resmask no longer needs towait the hotplug to finish, which means that concurrent hotplug and cpusetoperations are no longer possible. Therefore, the deadlock doesn t existanymore and it does not have to  break active protection  now. To fix thiswarning, just remove kernfs_break_active_protection operation in the cpuset_write_resmask .
 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(5.10.0):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(5.10.0):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(5.10.0):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-2025-1249

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