247 lines
14 KiB
JSON
247 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-99233",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.402Z",
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"datePublished": "2026-11-02T16:06:40.643Z",
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"dateUpdated": "2026-11-03T19:13:02.404Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-11-03T19:13:02.404Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/histograms: Verify event_call identity when updating synth_event refcount\n\nIn event_hist_trigger_parse() and hist_unreg_all(), the histogram\nregistration and unregistration paths look up find_synth_event() using\ntrace_event_name(file->event_call) and adjust se->ref if a match is\nfound.\n\nBecause find_synth_event() only compares the event basename, registering\nor removing a histogram on a non-synthetic trace event whose basename\nmatches a synthetic event erroneously modifies the synthetic event's\nreference count. If a histogram is registered on the non-synthetic\nevent before the synthetic event is created and removed afterwards,\nse->ref is decremented without a matching increment, allowing the\nsynthetic event to be freed while an active histogram action still holds\na pointer to it.\n\nIntroduce find_synth_event_call() to verify that &se->call matches\nfile->event_call before adjusting se->ref."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The colliding basename is supplied by local writes: event_trigger_write() → trigger_process_regex() → event_hist_trigger_parse()/hist_unreg_all() on events/<system>/<event>/trigger, and synth_events_write() → create_or_delete_synth_event() on synthetic_events. No network protocol carries this input.\nAC:L - The attacker drives a fully ordered sequence: a hist on a non-synth event (no se->ref++), then a same-basename synth event, then an ACTION_TRACE hist that stores data->synth_event and increments se->ref, then the !hist/hist_unreg_all path which decrements se->ref, then synth_event_delete(). event_mutex serializes it; no victim-owned state is required.\nPR:L - event_trigger_open() and synth_events_open() only call security_locked_down(LOCKDOWN_TRACEFS); both files are TRACE_MODE_WRITE (0640) with no capable() check. tracefs_parse_param() accepts uid=/gid= and tracefs_apply_options() applies that owner, so a delegated tracing user can write them; tracefs has no FS_USERNS_MOUNT.\nUI:N - The attacker writes the hist commands, creates and deletes the colliding synth event via synth_events_write(), and can fire the leftover ACTION_TRACE histogram from their own process (any syscall that hits the remaining event). No separate victim action is required.\nS:U - destroy_synth_event() kfree's struct synth_event while action_trace() still holds data->synth_event; that UAF is confined to the host tracing heap and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Once free_synth_event() has kfree'd the object, action_trace() still reads data->synth_event and trace_synth() follows event->tp and tp->funcs; reclaiming that kmalloc object lets the attacker control those reads, giving a kernel-memory disclosure primitive.\nI:H - trace_synth() calls probe_func taken from the dangling event->tp->funcs, and a later action_data_destroy() does data->synth_event->ref-- on the freed object; spraying the reclaimed synth_event therefore yields a function-pointer hijack and a write primitive.\nA:H - trace_synth() does static_key_enabled(&tp->key) on event->tp from the freed synth_event the first time the leftover histogram fires, which oopses on a poisoned or unmapped pointer; the UAF is repeatable at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/trace/trace_events_hist.c",
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"kernel/trace/trace_events_synth.c",
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"kernel/trace/trace_synth.h"
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],
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"versions": [
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{
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "381f543ed35c434d5b707369aa5dcd69ecf440af",
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"status": "affected",
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"versionType": "git"
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},
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "4472579bd1c83708b6fe623c870cdf728e947205",
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"status": "affected",
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"versionType": "git"
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},
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "23b4106e8b35823acc79e206c7745f55b9cfd78b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "06e816bed499fe47f39f12044382cc5d064485fb",
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"status": "affected",
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"versionType": "git"
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},
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "5597bb8db6855fcb97a67196d227fea359bcd81c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4b147936fa509650beaf638b331573c23ba4d609",
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"lessThan": "3403d9bb27ebc3572bd048620746b4414e073bf9",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/trace/trace_events_hist.c",
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"kernel/trace/trace_events_synth.c",
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"kernel/trace/trace_synth.h"
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],
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"versions": [
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{
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"version": "4.17",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.17",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.161",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.115",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.60",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.14",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3.1",
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"lessThanOrEqual": "7.3.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.4-rc1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"references": [
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"url": "https://git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b"
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"url": "https://git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb"
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},
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"url": "https://git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c"
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"url": "https://git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4"
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{
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}
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],
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"title": "tracing/histograms: Verify event_call identity when updating synth_event refcount",
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