CVE-2026-99140

Что произошло

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix hist trigger timestamps for buffered events Syzkaller triggered a WARN_ON_ONCE(!nest) warning: WARNING: kernel/trace/ring_buffer.c:821 at ring_buffer_event_time_stamp Call trace: ring_buffer_event_time_stamp hist_field_timestamp hist_fn_call event_hist_trigger event_triggers_call __event_trigger_test_discard trace_event_buffer_commit do_trace_event_raw_event_sched_switch trace_event_raw_event_sched_switch The warning is probabilistically reproducible and is related to syzkaller executing the following commands: echo 'prev_pid == 999999' > events/sched/sched_switch/filter echo 'hist:keys=common_timestamp' > events/sched/sched_switch/trigger The specific triggering process is as follows: CPU 0 CPU 1 (context switching) (echo 'hist:keys=common_timestamp' > \ events/sched/sched_switch/trigger) do_trace_event_raw_event_##call trace_event_buffer_lock_reserve if (!tr->no_filter_buffering_ref && trace_file->flags & EVENT_FILE_FL_FILTERED) return entry; // return directly event_hist_trigger_parse hist_register_trigger tracing_set_filter_buffering(file->tr, true); tr->no_filter_buffering_ref++; __trace_buffer_lock_reserve rb_start_commit local_inc(&cpu_buffer->committing); // skipped and not executed trace_event_buffer_commit __event_trigger_test_discard event_triggers_call event_hist_trigger hist_fn_call hist_field_timestamp ring_buffer_event_time_stamp nest = local_read(&cpu_buffer->committing); WARN_ON_ONCE(!nest) // trigger warning The root cause is that when an event file has a filter attached and the hist trigger has not yet been attached, trace_event_buffer_lock_reserve() writes the event into the per-CPU trace_buffered_event temp buffer instead of reserving it in the ring buffer, so cpu_buffer->committing is not incremented. When the event is later processed at commit time by a hist trigger, hist_field_timestamp() -> ring_buffer_event_time_stamp() sees a zero committing count, triggering WARN_ON_ONCE(!nest). tracing_event_time_stamp() was added by commit d8279bfc5e959 ("tracing: Add tracing_event_time_stamp() API") for exactly this case: if the event is the per-CPU trace_buffered_event, it returns the current ring buffer timestamp. But it never gained a caller. Use it in hist_field_timestamp(), so that a hist trigger that races onto a buffered event records the current time, which is only marginally later than when the event was recorded, instead of warning and recording a bogus timestamp.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "b3a94a79047d3fc9385b3709cb2b86f4a26ed0c3",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "71c5c7420478d94d6eb0b427f66fa41bbda651e3",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "ab320f6aa3769480f735ed0ad026c4a61799b7bc",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "af192a356e9830a0df231b590ad6fb1fc28c9315",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "09c7cce2e59e6b3b1807520bcb1980c561f15d1e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "89e90b16aadd6e66bd0323bc8dfc76a62e756b57",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "b94bc80df64823e676b506f8de7dcf6a688d681e",
  "lessThan": "9414ca3b99e5a7f1f3bf51c2a01b383e1b355dd0",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5.13"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "5.13",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "5.15.224",
  "versionType": "semver",
  "lessThanOrEqual": "5.15.*"
}

{
  "status": "unaffected",
  "version": "6.1.191",
  "versionType": "semver",
  "lessThanOrEqual": "6.1.*"
}

{
  "status": "unaffected",
  "version": "6.6.161",
  "versionType": "semver",
  "lessThanOrEqual": "6.6.*"
}

{
  "status": "unaffected",
  "version": "6.12.115",
  "versionType": "semver",
  "lessThanOrEqual": "6.12.*"
}

{
  "status": "unaffected",
  "version": "6.18.59",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.13",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:07.997416+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:42.008726+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:42.008726+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:42.008726+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:07.997416+00:00"
  },
  "references": [
    "cve",
    "ghsa",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-30T12:57:42.008726+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены04.11.2026, 00:16
2. Данные обновлены03.11.2026, 00:15
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены30.10.2026, 15:58
6. Данные обновлены28.10.2026, 23:51
7. Данные обновлены28.10.2026, 18:00
8. Опубликована28.10.2026, 15:17

Личная заметка и статус

Другие CVE того же продукта