CVE-2025-21884

一、漏洞信息
漏洞编号：CVE-2025-21884
漏洞归属组件：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：N/A None
Vector：CVSS：3.0/
漏洞简述：
In the Linux kernel, the following vulnerability has been resolved:net: better track kernel sockets lifetimeWhile kernel sockets are dismantled during pernet_operations->exit(),their freeing can be delayed by any tx packets still held in qdiscor device queues, due to skb_set_owner_w() prior calls.This then trigger the following warning from ref_tracker_dir_exit() [1]To fix this, make sure that kernel sockets own a reference on net->passive.Add sk_net_refcnt_upgrade() helper, used whenever a kernel socketis converted to a refcounted one.[1][ 136.263918][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.263918][ T35] sk_alloc+0x2b3/0x370[ 136.263918][ T35] inet6_create+0x6ce/0x10f0[ 136.263918][ T35] __sock_create+0x4c0/0xa30[ 136.263918][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.263918][ T35] igmp6_net_init+0x39/0x390[ 136.263918][ T35] ops_init+0x31e/0x590[ 136.263918][ T35] setup_net+0x287/0x9e0[ 136.263918][ T35] copy_net_ns+0x33f/0x570[ 136.263918][ T35] create_new_namespaces+0x425/0x7b0[ 136.263918][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.263918][ T35] ksys_unshare+0x57d/0xa70[ 136.263918][ T35] __x64_sys_unshare+0x38/0x40[ 136.263918][ T35] do_syscall_64+0xf3/0x230[ 136.263918][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f[ 136.263918][ T35][ 136.343488][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.343488][ T35] sk_alloc+0x2b3/0x370[ 136.343488][ T35] inet6_create+0x6ce/0x10f0[ 136.343488][ T35] __sock_create+0x4c0/0xa30[ 136.343488][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.343488][ T35] ndisc_net_init+0xa7/0x2b0[ 136.343488][ T35] ops_init+0x31e/0x590[ 136.343488][ T35] setup_net+0x287/0x9e0[ 136.343488][ T35] copy_net_ns+0x33f/0x570[ 136.343488][ T35] create_new_namespaces+0x425/0x7b0[ 136.343488][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.343488][ T35] ksys_unshare+0x57d/0xa70[ 136.343488][ T35] __x64_sys_unshare+0x38/0x40[ 136.343488][ T35] do_syscall_64+0xf3/0x230[ 136.343488][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f
漏洞公开时间：2025-03-27 23:15:56
漏洞创建时间：2025-03-27 23:48:31
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2025-21884

更多参考(点击展开)

参考来源	参考链接	来源链接
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5c70eb5c593d64d93b178905da215a9fd288a4b5
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c
suse_bugzilla	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2025-21884	https://bugzilla.suse.com/show_bug.cgi?id=1240171
suse_bugzilla	https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2025/CVE-2025-21884.mbox	https://bugzilla.suse.com/show_bug.cgi?id=1240171
suse_bugzilla	https://git.kernel.org/stable/c/c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c	https://bugzilla.suse.com/show_bug.cgi?id=1240171
suse_bugzilla	https://git.kernel.org/stable/c/5c70eb5c593d64d93b178905da215a9fd288a4b5	https://bugzilla.suse.com/show_bug.cgi?id=1240171
redhat_bugzilla	https://lore.kernel.org/linux-cve-announce/2025032713-CVE-2025-21884-b70c@gregkh/T	https://bugzilla.redhat.com/show_bug.cgi?id=2355399
anolis		https://anas.openanolis.cn/cves/detail/CVE-2025-21884

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：

详情(点击展开)

影响的包	修复版本	修复补丁	问题引入补丁	来源
linux_kernel	6.13.6	https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c31a732fac46b00b95b78fcc9c37cb48dd6f2e0cIssue	https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0cafd77dcd032d1687efaba5598cf07bce85997f	linuxkernelcves
linux_kernel	6.14	https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5c70eb5c593d64d93b178905da215a9fd288a4b5Please	https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0cafd77dcd032d1687efaba5598cf07bce85997f	linuxkernelcves

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:net: better track kernel sockets lifetimeWhile kernel sockets are dismantled during pernet_operations->exit(),their freeing can be delayed by any tx packets still held in qdiscor device queues, due to skb_set_owner_w() prior calls.This then trigger the following warning from ref_tracker_dir_exit() [1]To fix this, make sure that kernel sockets own a reference on net->passive.Add sk_net_refcnt_upgrade() helper, used whenever a kernel socketis converted to a refcounted one.[1][ 136.263918][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.263918][ T35] sk_alloc+0x2b3/0x370[ 136.263918][ T35] inet6_create+0x6ce/0x10f0[ 136.263918][ T35] __sock_create+0x4c0/0xa30[ 136.263918][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.263918][ T35] igmp6_net_init+0x39/0x390[ 136.263918][ T35] ops_init+0x31e/0x590[ 136.263918][ T35] setup_net+0x287/0x9e0[ 136.263918][ T35] copy_net_ns+0x33f/0x570[ 136.263918][ T35] create_new_namespaces+0x425/0x7b0[ 136.263918][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.263918][ T35] ksys_unshare+0x57d/0xa70[ 136.263918][ T35] __x64_sys_unshare+0x38/0x40[ 136.263918][ T35] do_syscall_64+0xf3/0x230[ 136.263918][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f[ 136.263918][ T35][ 136.343488][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.343488][ T35] sk_alloc+0x2b3/0x370[ 136.343488][ T35] inet6_create+0x6ce/0x10f0[ 136.343488][ T35] __sock_create+0x4c0/0xa30[ 136.343488][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.343488][ T35] ndisc_net_init+0xa7/0x2b0[ 136.343488][ T35] ops_init+0x31e/0x590[ 136.343488][ T35] setup_net+0x287/0x9e0[ 136.343488][ T35] copy_net_ns+0x33f/0x570[ 136.343488][ T35] create_new_namespaces+0x425/0x7b0[ 136.343488][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.343488][ T35] ksys_unshare+0x57d/0xa70[ 136.343488][ T35] __x64_sys_unshare+0x38/0x40[ 136.343488][ T35] do_syscall_64+0xf3/0x230[ 136.343488][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7fThe Linux kernel CVE team has assigned CVE-2025-21884 to this issue.
openEuler评分：
3.9
Vector：CVSS：3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
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.master(6.6.0):不受影响
4.openEuler-20.03-LTS-SP4(4.19.90):不受影响
5.openEuler-22.03-LTS-SP3(5.10.0):不受影响
6.openEuler-22.03-LTS-SP4(5.10.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响
8.openEuler-24.03-LTS-SP2(6.6.0):

修复是否涉及abi变化(是/否)：
1.master(6.6.0):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4(5.10.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否
8.openEuler-24.03-LTS-SP2(6.6.0):

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
8.openEuler-24.03-LTS-SP2(6.6.0):

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issue处理注意事项:
1. 当前issue受影响的分支提交pr时, 须在pr描述中填写当前issue编号进行关联, 否则无法关闭当前issue;
2. 模板内容需要填写完整, 无论是受影响或者不受影响都需要填写完整内容,未引入的分支不需要填写, 否则无法关闭当前issue;
3. 以下为模板中需要填写完整的内容, 请复制到评论区回复, 注: 内容的标题名称(影响性分析说明, openEuler评分, 受影响版本排查(受影响/不受影响), 修复是否涉及abi变化(是/否), 原因说明)不能省略,省略后cve-manager将无法正常解析填写内容.

影响性分析说明:

openEuler评分: (评分和向量)

受影响版本排查(受影响/不受影响):
1.master(6.6.0):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):

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

原因说明：
1.master(6.6.0):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):

原因说明填写请参考下方表格(注意：版本是否受影响和版本的原因说明必须对应，例如master版本分支受影响，那原因说明只能是受影响对应的原因之一!)：

分支状态	原因说明
受影响	正常修复
受影响	暂不修复-漏洞仍在分析中
受影响	暂不修复-暂无解决方案或补丁
受影响	暂不修复-待升级版本修复
受影响	不修复-超出修复范围
受影响	不修复-特殊原因导致不再修复
不受影响	不受影响-组件不存在
不受影响	不受影响-已有内置的内联控制或缓解措施
不受影响	不受影响-漏洞代码不能被攻击者触发
不受影响	不受影响-漏洞代码不在执行路径
不受影响	不受影响-漏洞代码不存在

issue处理具体操作请参考:
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
pr关联issue具体操作请参考:
https://gitee.com/help/articles/4142

参考网址	关联pr	状态	补丁链接
https://nvd.nist.gov/vuln/detail/CVE-2025-21884	None	None	https://git.kernel.org/stable/c/c31a732fac46b00b95b78fcc9c37cb48dd6f2e0c https://git.kernel.org/stable/c/5c70eb5c593d64d93b178905da215a9fd288a4b5
https://ubuntu.com/security/CVE-2025-21884	None	None	https://discourse.ubuntu.com/c/project
https://www.opencve.io/cve/CVE-2025-21884
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2025-21884
https://security-tracker.debian.org/tracker/CVE-2025-21884
http://www.cnnvd.org.cn/web/vulnerability/queryLds.tag?qcvCnnvdid=CVE-2025-21884

说明：补丁链接仅供初步排查参考，实际可用性请人工再次确认，补丁下载验证可使用CVE补丁工具。
若补丁不准确，烦请在此issue下评论 '/report-patch 参考网址补丁链接1,补丁链接2' 反馈正确信息，便于我们不断优化工具，不胜感激。
如 /report-patch https://security-tracker.debian.org/tracker/CVE-2021-3997 https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1

CVE-2025-21884

影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:

net: better track kernel sockets lifetime

While kernel sockets are dismantled during pernet_operations->exit(),
their freeing can be delayed by any tx packets still held in qdisc
or device queues, due to skb_set_owner_w() prior calls.

This then trigger the following warning from ref_tracker_dir_exit() [1]

To fix this, make sure that kernel sockets own a reference on net->passive.

Add sk_net_refcnt_upgrade() helper, used whenever a kernel socket
is converted to a refcounted one.

[1]

[ 136.263918][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at
[ 136.263918][ T35] sk_alloc+0x2b3/0x370
[ 136.263918][ T35] inet6_create+0x6ce/0x10f0
[ 136.263918][ T35] __sock_create+0x4c0/0xa30
[ 136.263918][ T35] inet_ctl_sock_create+0xc2/0x250
[ 136.263918][ T35] igmp6_net_init+0x39/0x390
[ 136.263918][ T35] ops_init+0x31e/0x590
[ 136.263918][ T35] setup_net+0x287/0x9e0
[ 136.263918][ T35] copy_net_ns+0x33f/0x570
[ 136.263918][ T35] create_new_namespaces+0x425/0x7b0
[ 136.263918][ T35] unshare_nsproxy_namespaces+0x124/0x180
[ 136.263918][ T35] ksys_unshare+0x57d/0xa70
[ 136.263918][ T35] __x64_sys_unshare+0x38/0x40
[ 136.263918][ T35] do_syscall_64+0xf3/0x230
[ 136.263918][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 136.263918][ T35]
[ 136.343488][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at
[ 136.343488][ T35] sk_alloc+0x2b3/0x370
[ 136.343488][ T35] inet6_create+0x6ce/0x10f0
[ 136.343488][ T35] __sock_create+0x4c0/0xa30
[ 136.343488][ T35] inet_ctl_sock_create+0xc2/0x250
[ 136.343488][ T35] ndisc_net_init+0xa7/0x2b0
[ 136.343488][ T35] ops_init+0x31e/0x590
[ 136.343488][ T35] setup_net+0x287/0x9e0
[ 136.343488][ T35] copy_net_ns+0x33f/0x570
[ 136.343488][ T35] create_new_namespaces+0x425/0x7b0
[ 136.343488][ T35] unshare_nsproxy_namespaces+0x124/0x180
[ 136.343488][ T35] ksys_unshare+0x57d/0xa70
[ 136.343488][ T35] __x64_sys_unshare+0x38/0x40
[ 136.343488][ T35] do_syscall_64+0xf3/0x230
[ 136.343488][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f

The Linux kernel CVE team has assigned CVE-2025-21884 to this issue.

openEuler评分:(评分和向量)
3.9
AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L

受影响版本排查(受影响/不受影响):
1.master(6.1.0):不受影响
2.openEuler-20.03-LTS-SP4:不受影响
3.openEuler-22.03-LTS-SP3:不受影响
4.openEuler-22.03-LTS-SP4:不受影响
5.openEuler-24.03-LTS:受影响
6.openEuler-24.03-LTS-Next:不受影响
7.openEuler-24.03-LTS-SP1:受影响

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

原因说明：
1.master(23.08.5):不受影响-漏洞代码不能被攻击者触发
2.openEuler-20.03-LTS-SP4:不受影响-漏洞代码不存在
4.openEuler-22.03-LTS-SP3:不受影响-漏洞代码不存在
5.openEuler-22.03-LTS-SP4:不受影响-漏洞代码不存在
6.openEuler-24.03-LTS:正常修复
7.openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发
8.openEuler-24.03-LTS-SP1:正常修复

@CTC-XiboWang 经过 cve-manager 解析, 已分析的内容如下表所示:

状态	分析项目	内容
已分析	1.影响性分析说明	In the Linux kernel, the following vulnerability has been resolved:net: better track kernel sockets lifetimeWhile kernel sockets are dismantled during pernet_operations->exit(),their freeing can be delayed by any tx packets still held in qdiscor device queues, due to skb_set_owner_w() prior calls.This then trigger the following warning from ref_tracker_dir_exit() [1]To fix this, make sure that kernel sockets own a reference on net->passive.Add sk_net_refcnt_upgrade() helper, used whenever a kernel socketis converted to a refcounted one.[1][ 136.263918][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.263918][ T35] sk_alloc+0x2b3/0x370[ 136.263918][ T35] inet6_create+0x6ce/0x10f0[ 136.263918][ T35] __sock_create+0x4c0/0xa30[ 136.263918][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.263918][ T35] igmp6_net_init+0x39/0x390[ 136.263918][ T35] ops_init+0x31e/0x590[ 136.263918][ T35] setup_net+0x287/0x9e0[ 136.263918][ T35] copy_net_ns+0x33f/0x570[ 136.263918][ T35] create_new_namespaces+0x425/0x7b0[ 136.263918][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.263918][ T35] ksys_unshare+0x57d/0xa70[ 136.263918][ T35] __x64_sys_unshare+0x38/0x40[ 136.263918][ T35] do_syscall_64+0xf3/0x230[ 136.263918][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7f[ 136.263918][ T35][ 136.343488][ T35] ref_tracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at[ 136.343488][ T35] sk_alloc+0x2b3/0x370[ 136.343488][ T35] inet6_create+0x6ce/0x10f0[ 136.343488][ T35] __sock_create+0x4c0/0xa30[ 136.343488][ T35] inet_ctl_sock_create+0xc2/0x250[ 136.343488][ T35] ndisc_net_init+0xa7/0x2b0[ 136.343488][ T35] ops_init+0x31e/0x590[ 136.343488][ T35] setup_net+0x287/0x9e0[ 136.343488][ T35] copy_net_ns+0x33f/0x570[ 136.343488][ T35] create_new_namespaces+0x425/0x7b0[ 136.343488][ T35] unshare_nsproxy_namespaces+0x124/0x180[ 136.343488][ T35] ksys_unshare+0x57d/0xa70[ 136.343488][ T35] __x64_sys_unshare+0x38/0x40[ 136.343488][ T35] do_syscall_64+0xf3/0x230[ 136.343488][ T35] entry_SYSCALL_64_after_hwframe+0x77/0x7fThe Linux kernel CVE team has assigned CVE-2025-21884 to this issue.
已分析	2.openEulerScore	3.9
已分析	3.openEulerVector	AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
已分析	4.受影响版本排查	openEuler-24.03-LTS:受影响,openEuler-24.03-LTS-SP1:受影响,master:不受影响,openEuler-20.03-LTS-SP4:不受影响,openEuler-22.03-LTS-SP3:不受影响,openEuler-22.03-LTS-SP4:不受影响,openEuler-24.03-LTS-Next:不受影响
已分析	5.是否涉及abi变化	master:否,openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP3:否,openEuler-22.03-LTS-SP4:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-Next:否,openEuler-24.03-LTS-SP1:否
已分析	6.原因说明	openEuler-24.03-LTS:正常修复,openEuler-24.03-LTS-SP1:正常修复,master:不受影响-漏洞代码不能被攻击者触发,openEuler-24.03-LTS-Next:不受影响-漏洞代码不能被攻击者触发,openEuler-20.03-LTS-SP4:不受影响-漏洞代码不存在,openEuler-22.03-LTS-SP3:不受影响-漏洞代码不存在,openEuler-22.03-LTS-SP4:不受影响-漏洞代码不存在

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src-openEuler/kernel

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CVE-2025-21884

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