{"api_version":"1","generated_at":"2026-09-25T22:18:34+00:00","cve":"CVE-2026-97936","urls":{"html":"https://cve.report/CVE-2026-97936","api":"https://cve.report/api/cve/CVE-2026-97936.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97936","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97936"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:20","updated_at":"2026-09-25 11:17:20"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a5e70ba87ca8ebc79b4e63de302d03b0625fe153","name":"https://git.kernel.org/stable/c/a5e70ba87ca8ebc79b4e63de302d03b0625fe153","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/55caaf25da2c2bb9b75307e4c868726cb954b1d6","name":"https://git.kernel.org/stable/c/55caaf25da2c2bb9b75307e4c868726cb954b1d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e183b84968d4a6ea476d806ea97668405aa56880","name":"https://git.kernel.org/stable/c/e183b84968d4a6ea476d806ea97668405aa56880","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/57bfc2a17954d173d2a4182f3b582ffbb23aff64","name":"https://git.kernel.org/stable/c/57bfc2a17954d173d2a4182f3b582ffbb23aff64","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97936","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97936","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314 e183b84968d4a6ea476d806ea97668405aa56880 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314 57bfc2a17954d173d2a4182f3b582ffbb23aff64 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314 55caaf25da2c2bb9b75307e4c868726cb954b1d6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314 a5e70ba87ca8ebc79b4e63de302d03b0625fe153 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/trace/trace_events_hist.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e183b84968d4a6ea476d806ea97668405aa56880","status":"affected","version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","versionType":"git"},{"lessThan":"57bfc2a17954d173d2a4182f3b582ffbb23aff64","status":"affected","version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","versionType":"git"},{"lessThan":"55caaf25da2c2bb9b75307e4c868726cb954b1d6","status":"affected","version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","versionType":"git"},{"lessThan":"a5e70ba87ca8ebc79b4e63de302d03b0625fe153","status":"affected","version":"cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/trace/trace_events_hist.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"6.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:22:50.446Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e183b84968d4a6ea476d806ea97668405aa56880"},{"url":"https://git.kernel.org/stable/c/57bfc2a17954d173d2a4182f3b582ffbb23aff64"},{"url":"https://git.kernel.org/stable/c/55caaf25da2c2bb9b75307e4c868726cb954b1d6"},{"url":"https://git.kernel.org/stable/c/a5e70ba87ca8ebc79b4e63de302d03b0625fe153"}],"title":"tracing: Fix memory corruption from the histogram stacktrace modifier","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-97936","datePublished":"2026-09-25T10:22:50.446Z","dateReserved":"2026-09-25T10:18:58.204Z","dateUpdated":"2026-09-25T10:22:50.446Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:20","lastModifiedDate":"2026-09-25 11:17:20","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97936","Ordinal":"1","Title":"tracing: Fix memory corruption from the histogram stacktrace mod","CVE":"CVE-2026-97936","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97936","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"tracing: Fix memory corruption from the histogram stacktrace mod"}]}}}