{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-68177",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-30T09:28:09.373Z",
        "datePublished": "2026-08-10T11:59:48.318Z",
        "dateUpdated": "2026-08-17T05:00:18.452Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:00:18.452Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Delay module ref count for \"enable_event\" trigger\n\nTriggers are now delayed from freeing, but can still be triggered until\nafter the RCU grace period has ended. The freeing of the enable_event data\nis put into the private_data_free() callback, but the put of the module\nrefcount is done immediately.\n\nIt is possible that if a module is removed that has an event that would\nenable (or disable) it is still active, it can read the data of the module\nafter it is removed causing a use-after-free bug.\n\nMove the trace_event_put_ref() that releases the module into the delayed\ncallback so that the module can not be removed until any reference to its\nevents are finished."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The bug is reached only via local `write()` to tracefs event `trigger` files to register/remove `enable_event`/`disable_event` triggers and via local `delete_module(2)`/`rmmod` to unload the referenced trace-event module; no network, adjacent, or physical input path reaches `event_enable_trigger_free()` or `event_enable_trigger()`.\nAC:L - The attacker controls both sides of the race: one thread removes the trigger (premature `trace_event_put_ref()`) and unloads the module while another continuously fires the bound source tracepoint, exploiting the deferred-free window before `tracepoint_synchronize_unregister()` completes in the trigger cleanup kthread.\nPR:L - Trigger registration/removal is gated only by tracefs DAC and `LOCKDOWN_TRACEFS` without `capable()`, which Android/ChromeOS/Perfetto and tracing-group mounts grant to ordinary users; unloading the held module is achievable with `CAP_SYS_MODULE` in a user namespace on permissive kernels loading attacker-controlled modules.\nUI:N - The attacker performs trigger setup/removal, module unload, and source-event generation from their own threads; no separate victim user action is required once tracefs and module privileges are available.\nS:U - The use-after-free corrupts kernel heap/trace structures within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After premature `trace_event_put_ref()` permits module removal, in-flight `event_enable_trigger()`/`event_enable_count_func()` dereference freed `trace_event_file` and module-resident `trace_event_call` data, exposing reclaimed kernel heap contents.\nI:H - `event_enable_trigger()` performs `set_bit`/`clear_bit` on `enable_data->file->flags` through a pointer to a kmem_cache-freed `trace_event_file`, giving a controllable kernel write primitive via heap shaping.\nA:H - Dereferencing freed module/event-file memory from tracepoint context readily causes kernel oops/panic, and the attacker can repeat the race at will."
                        }
                    ]
                }
            ],
            "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_trigger.c"
                    ],
                    "versions": [
                        {
                            "version": "61d445af0a7c70018111919e47beaaee15653f2f",
                            "lessThan": "159fdc3e01dca5fdbc412fcd8b239895733a270d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "61d445af0a7c70018111919e47beaaee15653f2f",
                            "lessThan": "e091351b38818ef620d27f44f4bfd625f13afbff",
                            "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_trigger.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.6",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "6.19",
                                    "versionEndExcluding": "7.1.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/159fdc3e01dca5fdbc412fcd8b239895733a270d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e091351b38818ef620d27f44f4bfd625f13afbff"
                }
            ],
            "title": "tracing: Delay module ref count for \"enable_event\" trigger",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}