{"id":"CVE-2022-50654","summary":"bpf: Fix panic due to wrong pageattr of im-\u003eimage","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix panic due to wrong pageattr of im-\u003eimage\n\nIn the scenario where livepatch and kretfunc coexist, the pageattr of\nim-\u003eimage is rox after arch_prepare_bpf_trampoline in\nbpf_trampoline_update, and then modify_fentry or register_fentry returns\n-EAGAIN from bpf_tramp_ftrace_ops_func, the BPF_TRAMP_F_ORIG_STACK flag\nwill be configured, and arch_prepare_bpf_trampoline will be re-executed.\n\nAt this time, because the pageattr of im-\u003eimage is rox,\narch_prepare_bpf_trampoline will read and write im-\u003eimage, which causes\na fault. as follows:\n\n  insmod livepatch-sample.ko    # samples/livepatch/livepatch-sample.c\n  bpftrace -e 'kretfunc:cmdline_proc_show {}'\n\nBUG: unable to handle page fault for address: ffffffffa0206000\nPGD 322d067 P4D 322d067 PUD 322e063 PMD 1297e067 PTE d428061\nOops: 0003 [#1] PREEMPT SMP PTI\nCPU: 2 PID: 270 Comm: bpftrace Tainted: G            E K    6.1.0 #5\nRIP: 0010:arch_prepare_bpf_trampoline+0xed/0x8c0\nRSP: 0018:ffffc90001083ad8 EFLAGS: 00010202\nRAX: ffffffffa0206000 RBX: 0000000000000020 RCX: 0000000000000000\nRDX: ffffffffa0206001 RSI: ffffffffa0206000 RDI: 0000000000000030\nRBP: ffffc90001083b70 R08: 0000000000000066 R09: ffff88800f51b400\nR10: 000000002e72c6e5 R11: 00000000d0a15080 R12: ffff8880110a68c8\nR13: 0000000000000000 R14: ffff88800f51b400 R15: ffffffff814fec10\nFS:  00007f87bc0dc780(0000) GS:ffff88803e600000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffa0206000 CR3: 0000000010b70000 CR4: 00000000000006e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\u003cTASK\u003e\n bpf_trampoline_update+0x25a/0x6b0\n __bpf_trampoline_link_prog+0x101/0x240\n bpf_trampoline_link_prog+0x2d/0x50\n bpf_tracing_prog_attach+0x24c/0x530\n bpf_raw_tp_link_attach+0x73/0x1d0\n __sys_bpf+0x100e/0x2570\n __x64_sys_bpf+0x1c/0x30\n do_syscall_64+0x5b/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nWith this patch, when modify_fentry or register_fentry returns -EAGAIN\nfrom bpf_tramp_ftrace_ops_func, the pageattr of im-\u003eimage will be reset\nto nx+rw.","modified":"2026-08-12T03:51:33.947568458Z","published":"2025-12-09T00:00:28.878Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50654.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7f656fff955ccb216c40fa188a24c05fa40985a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9ed1d9aeef5842ecacb660fce933613b58af1e00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9d383cbf812a3b4094c089aa5f5d41a3bb4531d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50654.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50654"},{"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":"00963a2e75a872e5fce4d0115ac2786ec86b57a6"},{"fixed":"d9d383cbf812a3b4094c089aa5f5d41a3bb4531d"},{"fixed":"7f656fff955ccb216c40fa188a24c05fa40985a5"},{"fixed":"9ed1d9aeef5842ecacb660fce933613b58af1e00"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50654.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.0.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50654.json"}}],"schema_version":"1.9.0"}