{"id":"CVE-2022-49087","summary":"rxrpc: fix a race in rxrpc_exit_net()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: fix a race in rxrpc_exit_net()\n\nCurrent code can lead to the following race:\n\nCPU0                                                 CPU1\n\nrxrpc_exit_net()\n                                                     rxrpc_peer_keepalive_worker()\n                                                       if (rxnet-\u003elive)\n\n  rxnet-\u003elive = false;\n  del_timer_sync(&rxnet-\u003epeer_keepalive_timer);\n\n                                                             timer_reduce(&rxnet-\u003epeer_keepalive_timer, jiffies + delay);\n\n  cancel_work_sync(&rxnet-\u003epeer_keepalive_work);\n\nrxrpc_exit_net() exits while peer_keepalive_timer is still armed,\nleading to use-after-free.\n\nsyzbot report was:\n\nODEBUG: free active (active state 0) object type: timer_list hint: rxrpc_peer_keepalive_timeout+0x0/0xb0\nWARNING: CPU: 0 PID: 3660 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nModules linked in:\nCPU: 0 PID: 3660 Comm: kworker/u4:6 Not tainted 5.17.0-syzkaller-13993-g88e6c0207623 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505\nCode: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 00 1c 26 8a 4c 89 ee 48 c7 c7 00 10 26 8a e8 b1 e7 28 05 \u003c0f\u003e 0b 83 05 15 eb c5 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3\nRSP: 0018:ffffc9000353fb00 EFLAGS: 00010082\nRAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000\nRDX: ffff888029196140 RSI: ffffffff815efad8 RDI: fffff520006a7f52\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffffff815ea4ae R11: 0000000000000000 R12: ffffffff89ce23e0\nR13: ffffffff8a2614e0 R14: ffffffff816628c0 R15: dffffc0000000000\nFS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fe1f2908924 CR3: 0000000043720000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n __debug_check_no_obj_freed lib/debugobjects.c:992 [inline]\n debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1023\n kfree+0xd6/0x310 mm/slab.c:3809\n ops_free_list.part.0+0x119/0x370 net/core/net_namespace.c:176\n ops_free_list net/core/net_namespace.c:174 [inline]\n cleanup_net+0x591/0xb00 net/core/net_namespace.c:598\n process_one_work+0x996/0x1610 kernel/workqueue.c:2289\n worker_thread+0x665/0x1080 kernel/workqueue.c:2436\n kthread+0x2e9/0x3a0 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298\n \u003c/TASK\u003e","modified":"2026-03-20T12:22:10.014747Z","published":"2025-02-26T01:54:44.557Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49087.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/08ff0e74fab517dbc44e11b8bc683dd4ecc65950"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1946014ca3b19be9e485e780e862c375c6f98bad"},{"type":"WEB","url":"https://git.kernel.org/stable/c/41024a40f6c793abbb916a857f18fb009f07464c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/571d8e1d154ca18f08dcb72b69318d36e10010a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ee84d29f22de6f6c63fad6c54690517659862f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/864297ee30727ae6233f80296b7fc91442620b05"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd8aef1f30d1215648e4e6686cfb422004851429"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49087.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49087"},{"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":"ace45bec6d77bc061c3c3d8ad99e298ea9800c2b"},{"fixed":"864297ee30727ae6233f80296b7fc91442620b05"},{"fixed":"7ee84d29f22de6f6c63fad6c54690517659862f1"},{"fixed":"08ff0e74fab517dbc44e11b8bc683dd4ecc65950"},{"fixed":"571d8e1d154ca18f08dcb72b69318d36e10010a0"},{"fixed":"41024a40f6c793abbb916a857f18fb009f07464c"},{"fixed":"cd8aef1f30d1215648e4e6686cfb422004851429"},{"fixed":"1946014ca3b19be9e485e780e862c375c6f98bad"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49087.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}