[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2021-46929":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"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-2021-46929","In the Linux kernel, the following vulnerability has been resolved:  sctp: use call_rcu to free endpoint  This patch is to delay the endpoint free by calling call_rcu() to fix another use-after-free issue in sctp_sock_dump():    BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20   Call Trace:     __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218     lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844     __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]     _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168     spin_lock_bh include/linux/spinlock.h:334 [inline]     __lock_sock+0x203/0x350 net/core/sock.c:2253     lock_sock_nested+0xfe/0x120 net/core/sock.c:2774     lock_sock include/net/sock.h:1492 [inline]     sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324     sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c:5091     sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527     __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049     inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065     netlink_dump+0x606/0x1080 net/netlink/af_netlink.c:2244     __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352     netlink_dump_start include/linux/netlink.h:216 [inline]     inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170     __sock_diag_cmd net/core/sock_diag.c:232 [inline]     sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263     netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477     sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274  This issue occurs when asoc is peeled off and the old sk is freed after getting it by asoc->base.sk and before calling lock_sock(sk).  To prevent the sk free, as a holder of the sk, ep should be alive when calling lock_sock(). This patch uses call_rcu() and moves sock_put and ep free into sctp_endpoint_destroy_rcu(), so that it's safe to try to hold the ep under rcu_read_lock in sctp_transport_traverse_process().  If sctp_endpoint_hold() returns true, it means this ep is still alive and we have held it and can continue to dump it; If it returns false, it means this ep is dead and can be freed after rcu_read_unlock, and we should skip it.  In sctp_sock_dump(), after locking the sk, if this ep is different from tsp->asoc->ep, it means during this dumping, this asoc was peeled off before calling lock_sock(), and the sk should be skipped; If this ep is the same with tsp->asoc->ep, it means no peeloff happens on this asoc, and due to lock_sock, no peeloff will happen either until release_sock.  Note that delaying endpoint free won't delay the port release, as the port release happens in sctp_endpoint_destroy() before calling call_rcu(). Also, freeing endpoint by call_rcu() makes it safe to access the sk by asoc->base.sk in sctp_assocs_seq_show() and sctp_rcv().  Thanks Jones to bring this issue up.  v1->v2:   - improve the changelog.   - add kfree(ep) into sctp_endpoint_destroy_rcu(), as Jakub noticed.",null,[],[],[],[14],{"_key":15},"CVE-2021-46929",[],[],[],"2024-02-27T10:15:07.573Z","2026-04-28T20:23:14.376730Z",{"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-2021-46929",[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",[46,52,55,56],{"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},"lt5_10_92_1",true,"ecosystem","5.10.92-1","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},"lt5_15_15_1","5.15.15-1",{"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},{"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}]