CVE-2026-68174

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68174", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.372Z", "datePublished": "2026-08-10T11:59:44.417Z", "dateUpdated": "2026-08-17T05:00:15.155Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:00:15.155Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix union collision of module and refcnt for dynamic events\n\nIn 'struct trace_event_call', the 'module' pointer and the 'refcnt'\natomic variable share the same memory space in a union. For dynamic\nevents, the union member is 'refcnt', which acts as an active\nreference counter.\n\nWhen a dynamic event (such as kprobe, uprobe, fprobe, eprobe, or\nwprobe) has a non-zero reference count (e.g. due to active event\ntriggers or perf attachments), its 'call->module' evaluates to a\nsmall non-zero integer instead of NULL.\n\nWhen filtering or setting events for a specific module (e.g., writing\n':mod:<module>' to 'set_event'), the code in\n'__ftrace_set_clr_event_nolock()' and 'update_event_fields()' reads\n'call->module' directly without checking whether the event is dynamic.\nThis causes the kernel to treat the small integer (refcnt) as a\n'struct module' pointer, leading to a NULL/invalid pointer dereference\n(Oops) when dereferencing the module name.\n\nFix this by ensuring that the 'TRACE_EVENT_FL_DYNAMIC' flag is checked\nbefore treating 'call->module' as a valid pointer in these code paths."}], "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.c"], "versions": [{"version": "4c86bc531e60900053384867c082675bba82c29f", "lessThan": "b6a4575f22925da7e6aa00171e9fc0e5029c0bc9", "status": "affected", "versionType": "git"}, {"version": "4c86bc531e60900053384867c082675bba82c29f", "lessThan": "43a23dfe0024afd3d2b0232e987d0292919a9b24", "status": "affected", "versionType": "git"}, {"version": "4c86bc531e60900053384867c082675bba82c29f", "lessThan": "b4eb07bde606c2096b24252be589e735eff6d413", "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.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "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": "6.14", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b6a4575f22925da7e6aa00171e9fc0e5029c0bc9"}, {"url": "https://git.kernel.org/stable/c/43a23dfe0024afd3d2b0232e987d0292919a9b24"}, {"url": "https://git.kernel.org/stable/c/b4eb07bde606c2096b24252be589e735eff6d413"}], "title": "tracing: Fix union collision of module and refcnt for dynamic events", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_events.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b6a4575f22925da7e6aa00171e9fc0e5029c0bc9", "status": "affected", "version": "4c86bc531e60900053384867c082675bba82c29f", "versionType": "git"}, {"lessThan": "43a23dfe0024afd3d2b0232e987d0292919a9b24", "status": "affected", "version": "4c86bc531e60900053384867c082675bba82c29f", "versionType": "git"}, {"lessThan": "b4eb07bde606c2096b24252be589e735eff6d413", "status": "affected", "version": "4c86bc531e60900053384867c082675bba82c29f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/trace_events.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix union collision of module and refcnt for dynamic events\n\nIn 'struct trace_event_call', the 'module' pointer and the 'refcnt'\natomic variable share the same memory space in a union. For dynamic\nevents, the union member is 'refcnt', which acts as an active\nreference counter.\n\nWhen a dynamic event (such as kprobe, uprobe, fprobe, eprobe, or\nwprobe) has a non-zero reference count (e.g. due to active event\ntriggers or perf attachments), its 'call->module' evaluates to a\nsmall non-zero integer instead of NULL.\n\nWhen filtering or setting events for a specific module (e.g., writing\n':mod:<module>' to 'set_event'), the code in\n'__ftrace_set_clr_event_nolock()' and 'update_event_fields()' reads\n'call->module' directly without checking whether the event is dynamic.\nThis causes the kernel to treat the small integer (refcnt) as a\n'struct module' pointer, leading to a NULL/invalid pointer dereference\n(Oops) when dereferencing the module name.\n\nFix this by ensuring that the 'TRACE_EVENT_FL_DYNAMIC' flag is checked\nbefore treating 'call->module' as a valid pointer in these code paths."}], "id": "CVE-2026-68174", "lastModified": "2026-08-17T05:18:18.927", "metrics": {}, "published": "2026-08-10T13:20:04.213", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/43a23dfe0024afd3d2b0232e987d0292919a9b24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b4eb07bde606c2096b24252be589e735eff6d413"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6a4575f22925da7e6aa00171e9fc0e5029c0bc9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel tracing: Denial of Service via invalid pointer dereference", "id": "2513202", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513202"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-843", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Fix union collision of module and refcnt for dynamic events\nIn 'struct trace_event_call', the 'module' pointer and the 'refcnt'\natomic variable share the same memory space in a union. For dynamic\nevents, the union member is 'refcnt', which acts as an active\nreference counter.\nWhen a dynamic event (such as kprobe, uprobe, fprobe, eprobe, or\nwprobe) has a non-zero reference count (e.g. due to active event\ntriggers or perf attachments), its 'call->module' evaluates to a\nsmall non-zero integer instead of NULL.\nWhen filtering or setting events for a specific module (e.g., writing\n':mod:<module>' to 'set_event'), the code in\n'__ftrace_set_clr_event_nolock()' and 'update_event_fields()' reads\n'call->module' directly without checking whether the event is dynamic.\nThis causes the kernel to treat the small integer (refcnt) as a\n'struct module' pointer, leading to a NULL/invalid pointer dereference\n(Oops) when dereferencing the module name.\nFix this by ensuring that the 'TRACE_EVENT_FL_DYNAMIC' flag is checked\nbefore treating 'call->module' as a valid pointer in these code paths.", "A flaw was found in the Linux kernel's tracing subsystem. When handling dynamic events, a memory collision occurs where a reference counter is mistakenly interpreted as a module pointer. This can happen when filtering or setting events for a specific module without properly checking the event's dynamic status. An attacker could exploit this by triggering a scenario that causes the kernel to attempt to dereference an invalid pointer, leading to a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-68174", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:59:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68174\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68174\nhttps://git.kernel.org/stable/c/43a23dfe0024afd3d2b0232e987d0292919a9b24\nhttps://git.kernel.org/stable/c/b4eb07bde606c2096b24252be589e735eff6d413\nhttps://git.kernel.org/stable/c/b6a4575f22925da7e6aa00171e9fc0e5029c0bc9"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c86bc531e60900053384867c082675bba82c29f,b6a4575f22925da7e6aa00171e9fc0e5029c0bc9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c86bc531e60900053384867c082675bba82c29f,43a23dfe0024afd3d2b0232e987d0292919a9b24)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c86bc531e60900053384867c082675bba82c29f,b4eb07bde606c2096b24252be589e735eff6d413)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T14:45:18.125275+00:00", "updated": "2026-08-13T09:45:03.654913+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}