{"cve":"CVE-2022-50259","nvd":{"published":"2025-09-15T14:15:36.750","modified":"2026-10-15T22:17:29.527","status":"Modified","description":"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 <0f> 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<TASK>\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</TASK>","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469","https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7","https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3","https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1","https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:08:41.295252406+00:00"},"epss":{"cve":"CVE-2022-50259","score":0.00118,"percentile":0.01719,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}