{"id":"CVE-2026-99247","revision":"f1b1e79f09124e2494e1f2d12f98ee5f","records":[{"revision":"f1b1e79f09124e2494e1f2d12f98ee5f","observedAt":"2026-11-03T12:57:16.958+00:00","statement":{"source":"cve-program","id":"CVE-2026-99247","aliases":[],"title":"tracing: Do not initialize tracefs work if tracing is disabled","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Do not initialize tracefs work if tracing is disabled\n\nIf trace buffer allocation fails during early boot (e.g.  in\nearly_trace_init() -> allocate_trace_buffers()), tracing_disabled is\nleft set to 1 and the global trace array events list remains\nuninitialized.\n\nLater during boot, tracer_init_tracefs() (invoked via fs_initcall)\nqueues tracerfs_init_work asynchronously without checking if tracing was\ndisabled.  When tracer_init_tracefs_work_func() runs, it calls\nevent_trace_init() and init_tracer_tracefs(&global_trace, NULL)\nunconditionally.  This leads to __find_event_file() dereferencing an\nuninitialized tr->events list, causing an early boot NULL pointer\ndereference Oops:\n\n  BUG: Kernel NULL pointer dereference on read at 0x00000010\n  Faulting instruction address: 0xc000000000485be0\n  Oops: Kernel access of bad area, sig: 7 [#1]\n  ...\n  NIP [c000000000485be0] __find_event_file+0x70/0x3c0\n  LR  [c000000000448874] init_tracer_tracefs+0x274/0xc80\n  Call Trace:\n   init_tracer_tracefs+0x274/0xc80\n   tracer_init_tracefs_work_func+0x50/0x320\n   process_one_work+0x1e8/0x5c0\n   worker_thread+0x1dc/0x3d0\n   kthread+0x194/0x1b0\n   start_kernel_thread+0x14/0x18\n\nCheck tracing_disabled at the beginning of tracer_init_tracefs_work_func()\nand return immediately if tracing is disabled or failed to initialize,\npreventing the crash.","state":0,"publishedAt":"2026-11-03T11:18:26.163+00:00","modifiedAt":"2026-11-03T11:18:26.163+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"e8665e884e076d894f3eed8b9ea28e37a6448604\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"e8cfcd7e60eaa3b0dea4d71c64499604e7081736\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"afd38b10b1c6a5c5d6952b15b990596dab9684e6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"813e18881c6472eb229a63180ff42c808e3e949b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"7539c61f522ff693d9565a0411386c2236e776cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6621a7004684bfcff5af4c8e4d37989941f42a6b\",\n                            \"lessThan\": \"b3b974008388ab59e44d764ba7a63c988fec2524\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.191\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.161\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.115\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e8665e884e076d894f3eed8b9ea28e37a6448604","https://git.kernel.org/stable/c/e8cfcd7e60eaa3b0dea4d71c64499604e7081736","https://git.kernel.org/stable/c/afd38b10b1c6a5c5d6952b15b990596dab9684e6","https://git.kernel.org/stable/c/813e18881c6472eb229a63180ff42c808e3e949b","https://git.kernel.org/stable/c/7539c61f522ff693d9565a0411386c2236e776cd","https://git.kernel.org/stable/c/b3b974008388ab59e44d764ba7a63c988fec2524"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99247","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99247","identifiers":["CVE-2026-99247"]},"retained":false,"historicalAffected":[]}],"coverage":[]}