{"schema_version":"1.9.0","id":"CVE-2022-49402","published":"2025-02-26T02:12:29.070Z","modified":"2026-08-12T03:51:18.314635974Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1194-1","SUSE-SU-2025:1241-1","SUSE-SU-2025:1263-1"],"summary":"ftrace: Clean up hash direct_functions on register failures","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Clean up hash direct_functions on register failures\n\nWe see the following GPF when register_ftrace_direct fails:\n\n[ ] general protection fault, probably for non-canonical address \\\n  0x200000000000010: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI\n[...]\n[ ] RIP: 0010:ftrace_find_rec_direct+0x53/0x70\n[ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...]\n[ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206\n[ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b\n[ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0\n[ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001\n[ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0\n[ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000\n[ ] FS:  00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000\n[ ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0\n[ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ ] Call Trace:\n[ ]  <TASK>\n[ ]  register_ftrace_direct+0x54/0x290\n[ ]  ? render_sigset_t+0xa0/0xa0\n[ ]  bpf_trampoline_update+0x3f5/0x4a0\n[ ]  ? 0xffffffffa00a3000\n[ ]  bpf_trampoline_link_prog+0xa9/0x140\n[ ]  bpf_tracing_prog_attach+0x1dc/0x450\n[ ]  bpf_raw_tracepoint_open+0x9a/0x1e0\n[ ]  ? find_held_lock+0x2d/0x90\n[ ]  ? lock_release+0x150/0x430\n[ ]  __sys_bpf+0xbd6/0x2700\n[ ]  ? lock_is_held_type+0xd8/0x130\n[ ]  __x64_sys_bpf+0x1c/0x20\n[ ]  do_syscall_64+0x3a/0x80\n[ ]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[ ] RIP: 0033:0x7fa9421defa9\n[ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...]\n[ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141\n[ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9\n[ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011\n[ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000\n[ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001\n[ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001\n[ ]  </TASK>\n[ ] Modules linked in: klp_vm(OK)\n[ ] ---[ end trace 0000000000000000 ]---\n\nOne way to trigger this is:\n  1. load a livepatch that patches kernel function xxx;\n  2. run bpftrace -e 'kfunc:xxx {}', this will fail (expected for now);\n  3. repeat #2 => gpf.\n\nThis is because the entry is added to direct_functions, but not removed.\nFix this by remove the entry from direct_functions when\nregister_ftrace_direct fails.\n\nAlso remove the last trailing space from ftrace.c, so we don't have to\nworry about it anymore.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"763e34e74bb7d5c316015e2e39fcc8520bfd071c"},{"fixed":"82c888e51c2176a06f8b4541cf748ee81aac6e7e"},{"fixed":"cae2978d6907ef2c08b9b15f704e783f7c284713"},{"fixed":"805e87af946d8d2954171361e64d143ff37a441b"},{"fixed":"a0392833a178cf109a57c2a9d4d531bdfc6cd98f"},{"fixed":"7d54c15cb89a29a5f59e5ffc9ee62e6591769ef1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49402.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.121"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.46"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.17.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.18.0"},{"fixed":"5.18.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49402.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7d54c15cb89a29a5f59e5ffc9ee62e6591769ef1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/805e87af946d8d2954171361e64d143ff37a441b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82c888e51c2176a06f8b4541cf748ee81aac6e7e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0392833a178cf109a57c2a9d4d531bdfc6cd98f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cae2978d6907ef2c08b9b15f704e783f7c284713"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49402.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49402"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49402.json"}}