{"id":"CVE-2022-49764","title":"bpf: Prevent bpf program recursion for raw tracepoint probes","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c4f6699dfcb8558d138fe838f741b2c10f416cf9 < 2e5399879024fedd6cdc41f73fbf9bbe7208f899","Linux >= c4f6699dfcb8558d138fe838f741b2c10f416cf9 < 05b24ff9b2cfabfcfd951daaa915a036ab53c9e1","Linux 4.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:46:55.963378Z"},"published":"2025-05-01","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:49:42.345Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49764","references":[{"url":"https://git.kernel.org/stable/c/2e5399879024fedd6cdc41f73fbf9bbe7208f899"},{"url":"https://git.kernel.org/stable/c/05b24ff9b2cfabfcfd951daaa915a036ab53c9e1"}],"tags":["cve.org"],"epss":0.00185,"epssPercentile":0.08131,"ingestedAt":"2026-11-05T22:38:31.585Z","slug":"CVE-2022-49764","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= c4f6699dfcb8558d138fe838f741b2c10f416cf9 < 2e5399879024fedd6cdc41f73fbf9bbe7208f899`\n- `Linux >= c4f6699dfcb8558d138fe838f741b2c10f416cf9 < 05b24ff9b2cfabfcfd951daaa915a036ab53c9e1`\n- `Linux 4.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}