[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2025-21884":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T20:55:29.923Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":39},"DEBIAN-CVE-2025-21884","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",null,[],[],[],[14],{"_key":15},"CVE-2025-21884",[],[],[],"2025-03-27T15:15:56.313Z","2026-04-28T20:29:35.754351Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2025-21884",[27],"osv_debian",[29],"Advisory",[],[],[33],{"source":27,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":34,"cvss_v4_0":9},{"baseScore":35,"baseSeverity":9,"vectorString":36,"impactScore":37,"exploitabilityScore":38},5.5,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",6,4.6,[40],{"ecosystem":41,"name":42,"vendor":43,"product":42,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":42,"source":9,"versions":45},"Debian","linux","debian","deb",[46,52],{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":50,"version_end_type":51,"fixed_in":9},"lt6_12_43_1",true,"ecosystem","6.12.43-1","excluding",{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":51,"fixed_in":9},"lt6_16_3_1","6.16.3-1"]