{"cve":"CVE-2022-49764","nvd":{"published":"2025-05-01T15:15:59.170","modified":"2026-06-17T05:19:05.513","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Prevent bpf program recursion for raw tracepoint probes\n\nWe got report from sysbot [1] about warnings that were caused by\nbpf program attached to contention_begin raw tracepoint triggering\nthe same tracepoint by using bpf_trace_printk helper that takes\ntrace_printk_lock lock.\n\n Call Trace:\n  <TASK>\n  ? trace_event_raw_event_bpf_trace_printk+0x5f/0x90\n  bpf_trace_printk+0x2b/0xe0\n  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24\n  bpf_trace_run2+0x26/0x90\n  native_queued_spin_lock_slowpath+0x1c6/0x2b0\n  _raw_spin_lock_irqsave+0x44/0x50\n  bpf_trace_printk+0x3f/0xe0\n  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24\n  bpf_trace_run2+0x26/0x90\n  native_queued_spin_lock_slowpath+0x1c6/0x2b0\n  _raw_spin_lock_irqsave+0x44/0x50\n  bpf_trace_printk+0x3f/0xe0\n  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24\n  bpf_trace_run2+0x26/0x90\n  native_queued_spin_lock_slowpath+0x1c6/0x2b0\n  _raw_spin_lock_irqsave+0x44/0x50\n  bpf_trace_printk+0x3f/0xe0\n  bpf_prog_a9aec6167c091eef_prog+0x1f/0x24\n  bpf_trace_run2+0x26/0x90\n  native_queued_spin_lock_slowpath+0x1c6/0x2b0\n  _raw_spin_lock_irqsave+0x44/0x50\n  __unfreeze_partials+0x5b/0x160\n  ...\n\nThe can be reproduced by attaching bpf program as raw tracepoint on\ncontention_begin tracepoint. The bpf prog calls bpf_trace_printk\nhelper. Then by running perf bench the spin lock code is forced to\ntake slow path and call contention_begin tracepoint.\n\nFixing this by skipping execution of the bpf program if it's\nalready running, Using bpf prog 'active' field, which is being\ncurrently used by trampoline programs for the same reason.\n\nMoving bpf_prog_inc_misses_counter to syscall.c because\ntrampoline.c is compiled in just for CONFIG_BPF_JIT option.\n\n[1] https://lore.kernel.org/bpf/YxhFe3EwqchC%2FfYf@krava/T/#t","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/05b24ff9b2cfabfcfd951daaa915a036ab53c9e1","https://git.kernel.org/stable/c/2e5399879024fedd6cdc41f73fbf9bbe7208f899"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:11.054312287+00:00"},"epss":{"cve":"CVE-2022-49764","score":0.00185,"percentile":0.08102,"date":"2026-10-31"},"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."]}