{"id":"CVE-2026-97936","revision":"1fd5396ff13946259ab18a450b6d036f","records":[{"revision":"1fd5396ff13946259ab18a450b6d036f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97936","aliases":[],"title":"tracing: Fix memory corruption from the histogram stacktrace modifier","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix memory corruption from the histogram stacktrace modifier\n\nparse_field() sets HIST_FIELD_FL_STACKTRACE from the \".stacktrace\"\nmodifier before it looks the field name up, and nothing afterwards\nchecks that the name resolved to a field which holds a stacktrace.\ncreate_hist_field() picks HIST_FIELD_FN_STACK on the strength of the\nfield pointer alone, which reads a __data_loc word from the record and\nfollows its low 16 bits as an offset into the same record.\nevent_hist_trigger() takes the first word there as an entry count and\ncopies that many longs into a 31 entry array:\n\n\tn_entries = *stack;\n\tmemcpy(entries, ++stack, n_entries * sizeof(unsigned long));\n\nNeither end of that copy is bounded, and the count is whatever the event\nholds at the offset, so any field will do:\n\n  # cd /sys/kernel/tracing/events/sched/sched_process_fork\n  # echo 'hist:keys=parent_pid.stacktrace' > trigger\n  # (true)\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  RIP: 0010:rb_insert_color+0x18/0x130\n   timerqueue_linked_add+0x7e/0xd0\n   enqueue_hrtimer+0x39/0xb0\n   __hrtimer_run_queues+0x10f/0x1f0\n   </IRQ>\n  RIP: 0010:memcpy+0xc/0x30\n   event_hist_trigger+0x165/0x690\n\nThe timer interrupt landed on the rbtree the copy had already run over.\nNo debug options are needed for this; KASAN reports the same write as an\nout-of-bounds read of 13835058055416381440 bytes.\n\nDocumentation/trace/histogram.rst already states the rule, \"must be a\nlong[] type\", so enforce it once the name has been resolved. Names which\nresolve to no field at all, \"hitcount.stacktrace\" and the common_*\npseudo-fields, are refused for the same reason: they hold no stacktrace\nto read.","state":0,"publishedAt":"2026-09-25T10:22:50.446+00:00","modifiedAt":"2026-10-19T09:11:02.941+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_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314\",\n                            \"lessThan\": \"98da3379cdee343f671dac89b9afbd8b071f2591\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314\",\n                            \"lessThan\": \"e183b84968d4a6ea476d806ea97668405aa56880\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314\",\n                            \"lessThan\": \"57bfc2a17954d173d2a4182f3b582ffbb23aff64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314\",\n                            \"lessThan\": \"55caaf25da2c2bb9b75307e4c868726cb954b1d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314\",\n                            \"lessThan\": \"a5e70ba87ca8ebc79b4e63de302d03b0625fe153\",\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_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\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/98da3379cdee343f671dac89b9afbd8b071f2591","https://git.kernel.org/stable/c/e183b84968d4a6ea476d806ea97668405aa56880","https://git.kernel.org/stable/c/57bfc2a17954d173d2a4182f3b582ffbb23aff64","https://git.kernel.org/stable/c/55caaf25da2c2bb9b75307e4c868726cb954b1d6","https://git.kernel.org/stable/c/a5e70ba87ca8ebc79b4e63de302d03b0625fe153"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97936","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97936","identifiers":["CVE-2026-97936"]},"retained":false,"historicalAffected":[]}],"coverage":[]}