{"schema":"threatline.record/2","record":{"id":"CVE-2026-97936","aliases":[],"summary":"tracing: Fix memory corruption from the histogram stacktrace modifier","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","source_modified_at":"2026-10-19T09:11:02.941Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","lessThan":"98da3379cdee343f671dac89b9afbd8b071f2591","status":"affected","versionType":"git"},{"version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","lessThan":"e183b84968d4a6ea476d806ea97668405aa56880","status":"affected","versionType":"git"},{"version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","lessThan":"57bfc2a17954d173d2a4182f3b582ffbb23aff64","status":"affected","versionType":"git"},{"version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","lessThan":"55caaf25da2c2bb9b75307e4c868726cb954b1d6","status":"affected","versionType":"git"},{"version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","lessThan":"a5e70ba87ca8ebc79b4e63de302d03b0625fe153","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","source_modified_at":"2026-10-19T09:11:02.941Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.3","status":"affected"},{"version":"0","lessThan":"6.3","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","source_modified_at":"2026-10-19T09:11:02.941Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"98da3379cdee343f671dac89b9afbd8b071f2591","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","source_modified_at":"2026-10-19T09:11:02.941Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"57bfc2a17954d173d2a4182f3b582ffbb23aff64","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","source_modified_at":"2026-10-19T09:11:02.941Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"55caaf25da2c2bb9b75307e4c868726cb954b1d6","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09327,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:50.446Z","modified_at":"2026-10-19T09:11:02.941Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:11:02.941Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97936","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/98da3379cdee343f671dac89b9afbd8b071f2591"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e183b84968d4a6ea476d806ea97668405aa56880"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/57bfc2a17954d173d2a4182f3b582ffbb23aff64"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/55caaf25da2c2bb9b75307e4c868726cb954b1d6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a5e70ba87ca8ebc79b4e63de302d03b0625fe153"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:11:02.941Z","content_hash":"e9f21fbdde200e223a0115e11d69d80a0359555b9edf24c5ad2971644c814193"}}