{"id":"CVE-2022-50259","summary":"bpf, sockmap: fix race in sock_map_free()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix race in sock_map_free()\n\nsock_map_free() calls release_sock(sk) without owning a reference\non the socket. This can cause use-after-free as syzbot found [1]\n\nJakub Sitnicki already took care of a similar issue\nin sock_hash_free() in commit 75e68e5bf2c7 (\"bpf, sockhash:\nSynchronize delete from bucket list on map free\")\n\n[1]\nrefcount_t: decrement hit 0; leaking memory.\nWARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31\nModules linked in:\nCPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nWorkqueue: events_unbound bpf_map_free_deferred\nRIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31\nCode: 68 8b 31 c0 e8 75 71 15 fd 0f 0b e9 64 ff ff ff e8 d9 6e 4e fd c6 05 62 9c 3d 0a 01 48 c7 c7 80 bb 68 8b 31 c0 e8 54 71 15 fd \u003c0f\u003e 0b e9 43 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a2 fe ff\nRSP: 0018:ffffc9000456fb60 EFLAGS: 00010246\nRAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0\nRDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000\nRBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5\nR10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004\nR13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf\nFS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30c30000 CR3: 000000000d08e000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\u003cTASK\u003e\n__refcount_dec include/linux/refcount.h:344 [inline]\nrefcount_dec include/linux/refcount.h:359 [inline]\n__sock_put include/net/sock.h:779 [inline]\ntcp_release_cb+0x2d0/0x360 net/ipv4/tcp_output.c:1092\nrelease_sock+0xaf/0x1c0 net/core/sock.c:3468\nsock_map_free+0x219/0x2c0 net/core/sock_map.c:356\nprocess_one_work+0x81c/0xd10 kernel/workqueue.c:2289\nworker_thread+0xb14/0x1330 kernel/workqueue.c:2436\nkthread+0x266/0x300 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n\u003c/TASK\u003e","modified":"2026-08-12T03:51:41.512868950Z","published":"2025-09-15T14:02:47.875Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50259.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50259.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50259"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"20ae0cb8983b05136d5293c47fadc99a8ca8ca2d"},{"fixed":"4cabc3af4a6f36c222fecb15858c1060e59218e7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b"},{"fixed":"be719496ae6a7fc325e9e5056a52f63ebc84cc0c"},{"fixed":"a443c55d96dede82a724df6e70a318ad15c199e1"},{"fixed":"e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62"},{"fixed":"5c3568166129bc73fd6b37748d2d8f95cd8f22f3"},{"fixed":"0a182f8d607464911756b4dbef5d6cad8de22469"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.14"},{"fixed":"5.4.229"}]}],"versions":["v5.4.228","v5.4.227","v5.4.226","v5.4.225","v5.4.224","v5.4.223","v5.4.222","v5.4.221","v5.4.220","v5.4.219","v5.4.218","v5.4.217","v5.4.216","v5.4.215","v5.4.214","v5.4.213","v5.4.212","v5.4.211","v5.4.210","v5.4.209","v5.4.208","v5.4.207","v5.4.206","v5.4.205","v5.4.204","v5.4.203","v5.4.202","v5.4.201","v5.4.200","v5.4.199","v5.4.198","v5.4.197","v5.4.196","v5.4.195","v5.4.194","v5.4.193","v5.4.192","v5.4.191","v5.4.190","v5.4.189","v5.4.188","v5.4.187","v5.4.186","v5.4.185","v5.4.184","v5.4.183","v5.4.182","v5.4.181","v5.4.180","v5.4.179","v5.4.178","v5.4.177","v5.4.176","v5.4.175","v5.4.174","v5.4.173","v5.4.172","v5.4.171","v5.4.170","v5.4.169","v5.4.168","v5.4.167","v5.4.166","v5.4.165","v5.4.164","v5.4.163","v5.4.162","v5.4.161","v5.4.160","v5.4.159","v5.4.158","v5.4.157","v5.4.156","v5.4.155","v5.4.154","v5.4.153","v5.4.152","v5.4.151","v5.4.150","v5.4.149","v5.4.148","v5.4.147","v5.4.146","v5.4.145","v5.4.144","v5.4.143","v5.4.142","v5.4.141","v5.4.140","v5.4.139","v5.4.138","v5.4.137","v5.4.136","v5.4.135","v5.4.134","v5.4.133","v5.4.132","v5.4.131","v5.4.130","v5.4.129","v5.4.128","v5.4.127","v5.4.126","v5.4.125","v5.4.124","v5.4.123","v5.4.122","v5.4.121","v5.4.120","v5.4.119","v5.4.118","v5.4.117","v5.4.116","v5.4.115","v5.4.114","v5.4.113","v5.4.112","v5.4.111","v5.4.110","v5.4.109","v5.4.108","v5.4.107","v5.4.106","v5.4.105","v5.4.104","v5.4.103","v5.4.102","v5.4.101","v5.4.100","v5.4.99","v5.4.98","v5.4.97","v5.4.96","v5.4.95","v5.4.94","v5.4.93","v5.4.92","v5.4.91","v5.4.90","v5.4.89","v5.4.88","v5.4.87","v5.4.86","v5.4.85","v5.4.84","v5.4.83","v5.4.82","v5.4.81","v5.4.80","v5.4.79","v5.4.78","v5.4.77","v5.4.76","v5.4.75","v5.4.74","v5.4.73","v5.4.72","v5.4.71","v5.4.70","v5.4.69","v5.4.68","v5.4.67","v5.4.66","v5.4.65","v5.4.64","v5.4.63","v5.4.62","v5.4.61","v5.4.60","v5.4.59","v5.4.58","v5.4.57","v5.4.56","v5.4.55","v5.4.54","v5.4.53","v5.4.52","v5.4.51","v5.4.50","v5.4.49","v5.4.48","v5.4.47","v5.4.46","v5.4.45","v5.4.44","v5.4.43","v5.4.42","v5.4.41","v5.4.40","v5.4.39","v5.4.38","v5.4.37","v5.4.36","v5.4.35","v5.4.34","v5.4.33","v5.4.32","v5.4.31","v5.4.30","v5.4.29","v5.4.28","v5.4.27","v5.4.26","v5.4.25","v5.4.24","v5.4.23","v5.4.22","v5.4.21","v5.4.20","v5.4.19","v5.4.18","v5.4.17","v5.4.16","v5.4.15","v5.4.14"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50259.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.229"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.163"},{"fixed":"5.15.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"6.0.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50259.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}