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CVE-2026-90014 (GCVE-0-2026-90014)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 14:41
VLAI
Title
tracing: Have show_event_filters/triggers files take trace array ref
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Have show_event_filters/triggers files take trace array ref The newly added files show_event_filters and show_event_triggers that show all filters or triggers that are set within the trace array do not take a reference for the trace array it is showing. Without taking a reference, the trace_array may be freed via "rmdir" while a task is reading one of theses files. Those files iterate all the events within an instance (trace_array) and nothing prevents that instance from being freed while its data is being read. This causes a use-after-free crash. Have the open of both those files take the trace_array reference via the trace_array_get() that prevents the trace_array from being freed while the files are opened.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 729757b96a662d87e334fe8b837707800d8fd551 , < 2ee3f7d43f79efaca0cd84a6798653d9d75ce60b (git)
Affected: 729757b96a662d87e334fe8b837707800d8fd551 , < f4a771cc684c7354b6200147f7252c58d17408ff (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
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              "status": "affected",
              "version": "729757b96a662d87e334fe8b837707800d8fd551",
              "versionType": "git"
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              "status": "affected",
              "version": "729757b96a662d87e334fe8b837707800d8fd551",
              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Have show_event_filters/triggers files take trace array ref\n\nThe newly added files show_event_filters and show_event_triggers that show\nall filters or triggers that are set within the trace array do not take a\nreference for the trace array it is showing. Without taking a reference,\nthe trace_array may be freed via \"rmdir\" while a task is reading one of\ntheses files. Those files iterate all the events within an instance\n(trace_array) and nothing prevents that instance from being freed while\nits data is being read. This causes a use-after-free crash.\n\nHave the open of both those files take the trace_array reference via the\ntrace_array_get() that prevents the trace_array from being freed while the\nfiles are opened."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached only via local tracefs: open/read of instances/\u003cname\u003e/show_event_filters or show_event_triggers (ftrace_event_show_*_open -\u003e seq_read -\u003e t_start) concurrent with rmdir(2) of that instance (tracefs_syscall_rmdir -\u003e instance_rmdir -\u003e __remove_instance). There is no network, adjacent-radio, or physical path.\nAC:L - The attacker owns both sides and can trigger it sequentially: mkdir an instance, open show_event_filters/triggers (no trace_array ref), rmdir it (__remove_instance sees tr-\u003eref==1 and kfree()s tr), then read the still-open fd. No victim state or uninfluenced layout is required; CONFIG_TRACING is standard.\nPR:L - The open path checks only LOCKDOWN_TRACEFS and DAC (files are 0440; instance mkdir/rmdir has no capable() gate). Tracefs uid=/gid=/mode= mounts on Android/Perfetto, ChromeOS, and distro tracing groups grant this to unprivileged users, matching CVE-2024-50207, CVE-2025-38101, and CVE-2026-74634.\nUI:N - The attacker creates the instance, opens the seq file, rmdirs it, and reads the fd from their own threads. No separate victim mount, click, or cooperating process is required.\nS:U - The use-after-free corrupts the host kernel\u0027s trace_array and event-file heap objects within the same OS security authority. It enables local privilege escalation but does not cross a VM, IOMMU, sandbox, or hardware trust boundary.\nC:H - After rmdir kfree()s the trace_array and its trace_event_file objects, t_start/t_next walk the freed tr-\u003eevents list and t_show_filters copies filter-\u003efilter_string to userspace via seq_printf, disclosing recycled kernel heap. Use-after-free is scored C:H.\nI:H - t_show_triggers invokes data-\u003ecmd_ops-\u003eprint() on use-after-free trigger objects, and walking the freed tr-\u003eevents list is a heap UAF write/control-flow primitive after spraying. Use-after-free is scored I:H.\nA:H - syzkaller reported a KASAN slab-use-after-free in t_start/t_next when the instance is removed while the file is read, which oopses or panics the kernel. Any use-after-free of the trace_array is a reliable whole-system crash even without full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:41:32.775Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2ee3f7d43f79efaca0cd84a6798653d9d75ce60b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4a771cc684c7354b6200147f7252c58d17408ff"
        }
      ],
      "title": "tracing: Have show_event_filters/triggers files take trace array ref",
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        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90014",
    "datePublished": "2026-09-16T10:33:20.791Z",
    "dateReserved": "2026-09-11T19:38:34.781Z",
    "dateUpdated": "2026-09-16T14:41:32.775Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-90014",
      "date": "2026-09-17",
      "epss": "0.00154",
      "percentile": "0.04929"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-90014\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:14.110\",\"lastModified\":\"2026-09-16T15:18:25.113\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Have show_event_filters/triggers files take trace array ref\\n\\nThe newly added files show_event_filters and show_event_triggers that show\\nall filters or triggers that are set within the trace array do not take a\\nreference for the trace array it is showing. Without taking a reference,\\nthe trace_array may be freed via \\\"rmdir\\\" while a task is reading one of\\ntheses files. Those files iterate all the events within an instance\\n(trace_array) and nothing prevents that instance from being freed while\\nits data is being read. This causes a use-after-free crash.\\n\\nHave the open of both those files take the trace_array reference via the\\ntrace_array_get() that prevents the trace_array from being freed while the\\nfiles are opened.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"729757b96a662d87e334fe8b837707800d8fd551\",\"lessThan\":\"2ee3f7d43f79efaca0cd84a6798653d9d75ce60b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"729757b96a662d87e334fe8b837707800d8fd551\",\"lessThan\":\"f4a771cc684c7354b6200147f7252c58d17408ff\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/trace/trace_events.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ee3f7d43f79efaca0cd84a6798653d9d75ce60b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4a771cc684c7354b6200147f7252c58d17408ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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