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vuln-cve/data/2026/99xxx/CVE-2026-99140.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99140",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.395Z",
"datePublished": "2026-10-28T10:34:51.421Z",
"dateUpdated": "2026-10-30T12:42:12.896Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:42:12.896Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix hist trigger timestamps for buffered events\n\nSyzkaller triggered a WARN_ON_ONCE(!nest) warning:\n\n WARNING: kernel/trace/ring_buffer.c:821 at ring_buffer_event_time_stamp\n Call trace:\n ring_buffer_event_time_stamp\n hist_field_timestamp\n hist_fn_call\n event_hist_trigger\n event_triggers_call\n __event_trigger_test_discard\n trace_event_buffer_commit\n do_trace_event_raw_event_sched_switch\n trace_event_raw_event_sched_switch\n\nThe warning is probabilistically reproducible and is related to syzkaller\nexecuting the following commands:\n\n echo 'prev_pid == 999999' > events/sched/sched_switch/filter\n echo 'hist:keys=common_timestamp' > events/sched/sched_switch/trigger\n\nThe specific triggering process is as follows:\n\nCPU 0 CPU 1\n(context switching) (echo 'hist:keys=common_timestamp' > \\\n events/sched/sched_switch/trigger)\ndo_trace_event_raw_event_##call\n trace_event_buffer_lock_reserve\n if (!tr->no_filter_buffering_ref &&\n trace_file->flags & EVENT_FILE_FL_FILTERED)\n return entry; // return directly\n event_hist_trigger_parse\n hist_register_trigger\n tracing_set_filter_buffering(file->tr, true);\n tr->no_filter_buffering_ref++;\n __trace_buffer_lock_reserve\n rb_start_commit\n local_inc(&cpu_buffer->committing); // skipped and not executed\n trace_event_buffer_commit\n __event_trigger_test_discard\n event_triggers_call\n event_hist_trigger\n hist_fn_call\n hist_field_timestamp\n ring_buffer_event_time_stamp\n nest = local_read(&cpu_buffer->committing);\n WARN_ON_ONCE(!nest) // trigger warning\n\nThe root cause is that when an event file has a filter attached and the\nhist trigger has not yet been attached, trace_event_buffer_lock_reserve()\nwrites the event into the per-CPU trace_buffered_event temp buffer instead\nof reserving it in the ring buffer, so cpu_buffer->committing is not\nincremented. When the event is later processed at commit time by a hist\ntrigger, hist_field_timestamp() -> ring_buffer_event_time_stamp() sees a\nzero committing count, triggering WARN_ON_ONCE(!nest).\n\ntracing_event_time_stamp() was added by commit d8279bfc5e959 (\"tracing:\nAdd tracing_event_time_stamp() API\") for exactly this case: if the event\nis the per-CPU trace_buffered_event, it returns the current ring buffer\ntimestamp. But it never gained a caller. Use it in hist_field_timestamp(),\nso that a hist trigger that races onto a buffered event records the\ncurrent time, which is only marginally later than when the event was\nrecorded, instead of warning and recording a bogus timestamp."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"versions": [
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "b3a94a79047d3fc9385b3709cb2b86f4a26ed0c3",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "71c5c7420478d94d6eb0b427f66fa41bbda651e3",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "ab320f6aa3769480f735ed0ad026c4a61799b7bc",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "af192a356e9830a0df231b590ad6fb1fc28c9315",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "09c7cce2e59e6b3b1807520bcb1980c561f15d1e",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "89e90b16aadd6e66bd0323bc8dfc76a62e756b57",
"status": "affected",
"versionType": "git"
},
{
"version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
"lessThan": "9414ca3b99e5a7f1f3bf51c2a01b383e1b355dd0",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"versions": [
{
"version": "5.13",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.13",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.59",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.13",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "6.6.161"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "6.12.115"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "6.18.59"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "7.2.13"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.13",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/b3a94a79047d3fc9385b3709cb2b86f4a26ed0c3"
},
{
"url": "https://git.kernel.org/stable/c/71c5c7420478d94d6eb0b427f66fa41bbda651e3"
},
{
"url": "https://git.kernel.org/stable/c/ab320f6aa3769480f735ed0ad026c4a61799b7bc"
},
{
"url": "https://git.kernel.org/stable/c/af192a356e9830a0df231b590ad6fb1fc28c9315"
},
{
"url": "https://git.kernel.org/stable/c/09c7cce2e59e6b3b1807520bcb1980c561f15d1e"
},
{
"url": "https://git.kernel.org/stable/c/89e90b16aadd6e66bd0323bc8dfc76a62e756b57"
},
{
"url": "https://git.kernel.org/stable/c/9414ca3b99e5a7f1f3bf51c2a01b383e1b355dd0"
}
],
"title": "tracing: Fix hist trigger timestamps for buffered events",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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