CVE-2026-98076 (GCVE-0-2026-98076)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:24 – Updated: 2026-10-19 09:13
VLAI
Title
tracing/probes: Fix use-after-free on field name/type of events with multiple probes
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/probes: Fix use-after-free on field name/type of events with multiple probes The fields of a probe-based dynamic event (kprobe, uprobe, eprobe and fprobe events) are created in traceprobe_define_arg_fields() by handing the probe_arg name/type strings to trace_define_field(), which only stores the pointers without copying. Those strings are owned by the trace_probe and are freed when that probe is removed. An event can have several probes attached. The field list is defined only once, by the first probe that registers the event, but it is kept alive by any surviving sibling probe. Deleting just that first probe by symbol - # primary A: fields are defined from A's args echo 'p:kprobes/ev vfs_read a1=$arg1' > kprobe_events # append B: shares A's event call echo 'p:kprobes/ev vfs_write a1=$arg1' >> kprobe_events # delete only A (matched by symbol), B survives echo '-:kprobes/ev vfs_read' >> kprobe_events frees A's args (trace_probe_cleanup() -> traceprobe_free_probe_arg()), but trace_probe_unlink() keeps the trace_probe_event because the probe list is not empty. The event call stays registered via B while its fields now reference freed memory. Any field lookup then reads it, e.g. echo 'a1 == 1' > events/kprobes/ev/filter BUG: KASAN: slab-use-after-free in strcmp+0xa7/0xb0 Call Trace: strcmp trace_find_event_field parse_pred process_preds create_filter apply_event_filter event_filter_write field->name references parg->name (kstrdup'd, freed with the probe) and, for array arguments, field->type references parg->fmt (kmalloc'd, freed with the probe) - the scalar type otherwise points at the static fmttype rodata, which is safe. Have traceprobe_define_arg_fields() duplicate the name and type strings and anchor the copies on the trace_probe_event, which embeds the event call and outlives every individual probe; trace_probe_event_free() releases them. The reproducer above triggers reliably; the field lookup and the delete both run under event_mutex, so this is a dangling reference after removal rather than a race. The issue was found by the autokbug dynamic kernel fuzzer at Tencent Yunding Lab.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 38305e1b8b1ec27eef8f2d4e461e3b6c8624d494 (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 6d6118c17bc791594cbfd9cc4936ee21073b894a (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < a2510fcaad92b09b34574c97e8356234c6a84a9a (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 9379e193826f23876daccb3351fab89c87084ba3 (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 68ae584169c7a41fc9bc4677c1d368983cf44b21 (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 411c9080a776577664531b4f7d3ee53b7a747ba8 (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 178ff2e011e21fbebdf57f5d58a408fe59136d82 (git)
Affected: ca89bc071d5e4e981dcc52e0ca90f4500d332e42 , < 86b7a239ec6b14a7544200ede85474c6f5526049 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/probes: Fix use-after-free on field name/type of events with multiple probes\n\nThe fields of a probe-based dynamic event (kprobe, uprobe, eprobe and\nfprobe events) are created in traceprobe_define_arg_fields() by handing\nthe probe_arg name/type strings to trace_define_field(), which only\nstores the pointers without copying. Those strings are owned by the\ntrace_probe and are freed when that probe is removed.\n\nAn event can have several probes attached. The field list is defined\nonly once, by the first probe that registers the event, but it is kept\nalive by any surviving sibling probe. Deleting just that first probe by\nsymbol -\n\n  # primary A: fields are defined from A\u0027s args\n  echo \u0027p:kprobes/ev vfs_read  a1=$arg1\u0027 \u003e  kprobe_events\n  # append B: shares A\u0027s event call\n  echo \u0027p:kprobes/ev vfs_write a1=$arg1\u0027 \u003e\u003e kprobe_events\n  # delete only A (matched by symbol), B survives\n  echo \u0027-:kprobes/ev vfs_read\u0027           \u003e\u003e kprobe_events\n\nfrees A\u0027s args (trace_probe_cleanup() -\u003e traceprobe_free_probe_arg()),\nbut trace_probe_unlink() keeps the trace_probe_event because the probe\nlist is not empty. The event call stays registered via B while its\nfields now reference freed memory. Any field lookup then reads it, e.g.\n\n  echo \u0027a1 == 1\u0027 \u003e events/kprobes/ev/filter\n\n  BUG: KASAN: slab-use-after-free in strcmp+0xa7/0xb0\n  Call Trace:\n   strcmp\n   trace_find_event_field\n   parse_pred\n   process_preds\n   create_filter\n   apply_event_filter\n   event_filter_write\n\nfield-\u003ename references parg-\u003ename (kstrdup\u0027d, freed with the probe) and,\nfor array arguments, field-\u003etype references parg-\u003efmt (kmalloc\u0027d, freed\nwith the probe) - the scalar type otherwise points at the static\nfmttype rodata, which is safe.\n\nHave traceprobe_define_arg_fields() duplicate the name and type strings\nand anchor the copies on the trace_probe_event, which embeds the event\ncall and outlives every individual probe; trace_probe_event_free()\nreleases them.\n\nThe reproducer above triggers reliably; the field lookup and the delete\nboth run under event_mutex, so this is a dangling reference after\nremoval rather than a race.\n\nThe issue was found by the autokbug dynamic kernel fuzzer at Tencent\nYunding Lab."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6d6118c17bc791594cbfd9cc4936ee21073b894a"
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          "url": "https://git.kernel.org/stable/c/a2510fcaad92b09b34574c97e8356234c6a84a9a"
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          "url": "https://git.kernel.org/stable/c/68ae584169c7a41fc9bc4677c1d368983cf44b21"
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    "datePublished": "2026-09-25T10:24:15.085Z",
    "dateReserved": "2026-09-25T10:19:56.074Z",
    "dateUpdated": "2026-10-19T09:13:25.874Z",
    "state": "PUBLISHED"
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      "date": "2026-11-13",
      "epss": "0.00216",
      "percentile": "0.122"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:39:00.000Z",
      "cve": "CVE-2026-98076",
      "id": "msrc_CVE-2026-98076",
      "initial_release_date": "2026-09-27T23:51:18.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tracing/probes: Fix use-after-free on field name/type of events with multiple probes",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98076.json",
      "version": "4"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/probes: Fix use-after-free on field name/type of events with multiple probes\n\nThe fields of a probe-based dynamic event (kprobe, uprobe, eprobe and\nfprobe events) are created in traceprobe_define_arg_fields() by handing\nthe probe_arg name/type strings to trace_define_field(), which only\nstores the pointers without copying. Those strings are owned by the\ntrace_probe and are freed when that probe is removed.\n\nAn event can have several probes attached. The field list is defined\nonly once, by the first probe that registers the event, but it is kept\nalive by any surviving sibling probe. Deleting just that first probe by\nsymbol -\n\n  # primary A: fields are defined from A\u0027s args\n  echo \u0027p:kprobes/ev vfs_read  a1=$arg1\u0027 \u003e  kprobe_events\n  # append B: shares A\u0027s event call\n  echo \u0027p:kprobes/ev vfs_write a1=$arg1\u0027 \u003e\u003e kprobe_events\n  # delete only A (matched by symbol), B survives\n  echo \u0027-:kprobes/ev vfs_read\u0027           \u003e\u003e kprobe_events\n\nfrees A\u0027s args (trace_probe_cleanup() -\u003e traceprobe_free_probe_arg()),\nbut trace_probe_unlink() keeps the trace_probe_event because the probe\nlist is not empty. The event call stays registered via B while its\nfields now reference freed memory. Any field lookup then reads it, e.g.\n\n  echo \u0027a1 == 1\u0027 \u003e events/kprobes/ev/filter\n\n  BUG: KASAN: slab-use-after-free in strcmp+0xa7/0xb0\n  Call Trace:\n   strcmp\n   trace_find_event_field\n   parse_pred\n   process_preds\n   create_filter\n   apply_event_filter\n   event_filter_write\n\nfield-\u003ename references parg-\u003ename (kstrdup\u0027d, freed with the probe) and,\nfor array arguments, field-\u003etype references parg-\u003efmt (kmalloc\u0027d, freed\nwith the probe) - the scalar type otherwise points at the static\nfmttype rodata, which is safe.\n\nHave traceprobe_define_arg_fields() duplicate the name and type strings\nand anchor the copies on the trace_probe_event, which embeds the event\ncall and outlives every individual probe; trace_probe_event_free()\nreleases them.\n\nThe reproducer above triggers reliably; the field lookup and the delete\nboth run under event_mutex, so this is a dangling reference after\nremoval rather than a race.\n\nThe issue was found by the autokbug dynamic kernel fuzzer at Tencent\nYunding Lab."
          }
        ],
        "id": "CVE-2026-98076",
        "lastModified": "2026-10-19T10:18:03.277",
        "metrics": {},
        "published": "2026-09-25T11:17:36.963",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/178ff2e011e21fbebdf57f5d58a408fe59136d82"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/38305e1b8b1ec27eef8f2d4e461e3b6c8624d494"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/411c9080a776577664531b4f7d3ee53b7a747ba8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/68ae584169c7a41fc9bc4677c1d368983cf44b21"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6d6118c17bc791594cbfd9cc4936ee21073b894a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/86b7a239ec6b14a7544200ede85474c6f5526049"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9379e193826f23876daccb3351fab89c87084ba3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a2510fcaad92b09b34574c97e8356234c6a84a9a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Undergoing Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T02:44:34+00:00",
      "cve": "CVE-2026-98076",
      "id": "CVE-2026-98076",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing/probes: Fix use-after-free on field name/type of events with multiple probes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98076.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-16T16:29:21Z",
      "cve": "CVE-2026-98076",
      "id": "CVE-2026-98076",
      "initial_release_date": "2026-10-01T16:04:44Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98076",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98076.json",
      "version": "5"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.