CVE-2026-99163 (GCVE-0-2026-99163)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-31 12:44
VLAI
Title
tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields In check_synth_field(), when a synthetic event field is a stacktrace (field->is_stack) and the histogram field is not a "long[" stacktrace array, validation falls through to the generic size and signedness comparison. Because parse_synth_field() sets a stacktrace field's type to "__data_loc unsigned long[]", its size is sizeof(u64) and synth_field_signed() marks it as signed. Consequently, any 8-byte signed scalar histogram field passes the fallback check, and its scalar value is subsequently dereferenced as a kernel stacktrace pointer in get_field_size() and trace_stack(). Furthermore, checking strstr(hist_field->type, "long[") is insufficient because tracepoint fields defined with __bitmask() or __rel_bitmask() also have type "__data_loc unsigned long[]" or "__rel_loc unsigned long[]", whilst create_hist_field() treats them as 4-byte scalar values without HIST_FIELD_FL_STACKTRACE. Propagate HIST_FIELD_FL_STACKTRACE to variable references and field variables (whilst excluding variable aliases from per-element stacktrace capture), and reject any mismatch between HIST_FIELD_FL_STACKTRACE and field->is_stack in check_synth_field().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: b9453380c1c542fd095a4dbe9251eeba4022bbce , < eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5 (git)
Affected: 5f52389bdd9eafb63b3a2f804e02aeb17b6a5f55 , < 326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be (git)
Affected: f3baa42afeea0d5f04ad31525e861199d02210cc , < 6c4e4946febb585d2fc93a02a0cd12cec715bb32 (git)
Affected: 00cf3d672a9dd409418647e9f98784c339c3ff63 , < 7e0d05a6234a984ac23b8a563fb7f66f2572b668 (git)
Affected: 00cf3d672a9dd409418647e9f98784c339c3ff63 , < 648687f2b448d8527cd7b112fe5d4bd0fec85a87 (git)
Affected: 00cf3d672a9dd409418647e9f98784c339c3ff63 , < 1f36e4ddd05d540f363dbaa4c23042549f15b3ef (git)
Affected: 00cf3d672a9dd409418647e9f98784c339c3ff63 , < deb336ae7c7b341591a6862cf6fcfeca97c77dfd (git)
Affected: 00cf3d672a9dd409418647e9f98784c339c3ff63 , < a244c241593b5b38a08f0df2cb43c26574efbdcb (git)
Affected: 5.10.237 , < 5.10.273 (semver)
Affected: 5.15.124 , < 5.15.224 (semver)
Affected: 6.1.43 , < 6.1.191 (semver)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields\n\nIn check_synth_field(), when a synthetic event field is a stacktrace\n(field-\u003eis_stack) and the histogram field is not a \"long[\" stacktrace\narray, validation falls through to the generic size and signedness\ncomparison.\n\nBecause parse_synth_field() sets a stacktrace field\u0027s type to\n\"__data_loc unsigned long[]\", its size is sizeof(u64) and\nsynth_field_signed() marks it as signed.  Consequently, any 8-byte\nsigned scalar histogram field passes the fallback check, and its scalar\nvalue is subsequently dereferenced as a kernel stacktrace pointer in\nget_field_size() and trace_stack().\n\nFurthermore, checking strstr(hist_field-\u003etype, \"long[\") is insufficient\nbecause tracepoint fields defined with __bitmask() or __rel_bitmask()\nalso have type \"__data_loc unsigned long[]\" or \"__rel_loc unsigned\nlong[]\", whilst create_hist_field() treats them as 4-byte scalar values\nwithout HIST_FIELD_FL_STACKTRACE.\n\nPropagate HIST_FIELD_FL_STACKTRACE to variable references and field\nvariables (whilst excluding variable aliases from per-element\nstacktrace capture), and reject any mismatch between\nHIST_FIELD_FL_STACKTRACE and field-\u003eis_stack in check_synth_field()."
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            "version": "3.1"
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              "value": "AV:L - Local writes to tracefs synthetic_events and events/.../trigger supply the bad field/action; event_trigger_write() \u2192 event_hist_trigger_parse() \u2192 create_actions() \u2192 the patched check_synth_field(). No network or physical input reaches it.\nAC:L - The attacker can deterministically create the stack field, map an 8-byte signed scalar or expression to it, enable the synthetic event, and issue their own triggering syscall; no race or uncontrollable state is required.\nPR:L - Although these files are mode 0640, tracefs_parse_param() accepts uid= and tracefs_apply_options() propagates that owner to synthetic_events and eventfs trigger files, allowing a delegated non-root tracing account to write both; user namespaces alone cannot mount tracefs.\nUI:N - The attacker performs every required tracefs write and triggers the configured histogram through their own syscall or selected tracepoint, without another user\u0027s action.\nS:U - The invalid pointer dereference and ring-buffer overwrite occur entirely within the host kernel\u0027s tracing subsystem and do not cross a VM, IOMMU, or separate security authority.\nC:H - An 8-byte signed histogram expression can hold a chosen address; get_field_size() dereferences it and trace_stack() copies up to 16 machine words into a synthetic-event record readable from the trace buffer, permitting repeatable kernel-memory disclosure.\nI:H - get_field_size() sizes the record from the pointer\u0027s first word, while trace_stack() independently scans up to 16 nonzero words before memcpy(); a mismatched count therefore writes past the reserved ring-buffer record.\nA:H - Mapping raw_syscalls:sys_enter.id directly to the stack field makes get_field_size() dereference a small invalid address on the attacker\u0027s next syscall, producing a deterministic, repeatable kernel oops."
            }
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        },
        {
          "url": "https://git.kernel.org/stable/c/a244c241593b5b38a08f0df2cb43c26574efbdcb"
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      "title": "tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields",
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    "cveId": "CVE-2026-99163",
    "datePublished": "2026-10-28T10:35:15.577Z",
    "dateReserved": "2026-09-25T10:25:14.398Z",
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      "cve": "CVE-2026-99163",
      "date": "2026-11-10",
      "epss": "0.00134",
      "percentile": "0.02947"
    },
    "microsoft_vex": {
      "current_release_date": "2026-11-07T01:49:00.000Z",
      "cve": "CVE-2026-99163",
      "id": "msrc_CVE-2026-99163",
      "initial_release_date": "2026-10-29T01:06:42.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99163.json",
      "version": "4"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/histograms: Reject non-stacktrace fields for synthetic stacktrace fields\n\nIn check_synth_field(), when a synthetic event field is a stacktrace\n(field-\u003eis_stack) and the histogram field is not a \"long[\" stacktrace\narray, validation falls through to the generic size and signedness\ncomparison.\n\nBecause parse_synth_field() sets a stacktrace field\u0027s type to\n\"__data_loc unsigned long[]\", its size is sizeof(u64) and\nsynth_field_signed() marks it as signed.  Consequently, any 8-byte\nsigned scalar histogram field passes the fallback check, and its scalar\nvalue is subsequently dereferenced as a kernel stacktrace pointer in\nget_field_size() and trace_stack().\n\nFurthermore, checking strstr(hist_field-\u003etype, \"long[\") is insufficient\nbecause tracepoint fields defined with __bitmask() or __rel_bitmask()\nalso have type \"__data_loc unsigned long[]\" or \"__rel_loc unsigned\nlong[]\", whilst create_hist_field() treats them as 4-byte scalar values\nwithout HIST_FIELD_FL_STACKTRACE.\n\nPropagate HIST_FIELD_FL_STACKTRACE to variable references and field\nvariables (whilst excluding variable aliases from per-element\nstacktrace capture), and reject any mismatch between\nHIST_FIELD_FL_STACKTRACE and field-\u003eis_stack in check_synth_field()."
          }
        ],
        "id": "CVE-2026-99163",
        "lastModified": "2026-10-31T13:17:58.123",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-28T11:17:36.613",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1f36e4ddd05d540f363dbaa4c23042549f15b3ef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/326c45c9e201e3ff4c9e9e0e14c2c91364d6c8be"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/648687f2b448d8527cd7b112fe5d4bd0fec85a87"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6c4e4946febb585d2fc93a02a0cd12cec715bb32"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7e0d05a6234a984ac23b8a563fb7f66f2572b668"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a244c241593b5b38a08f0df2cb43c26574efbdcb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/deb336ae7c7b341591a6862cf6fcfeca97c77dfd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eba0a6365a0f38f7598a02fc7f9ee341c7efe7f5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-09T11:59:27+00:00",
      "cve": "CVE-2026-99163",
      "id": "CVE-2026-99163",
      "initial_release_date": "2026-10-28T10:35:15.577000+00:00",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "201",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via improper field validation in synthetic event tracing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99163.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-10T18:07:37Z",
      "cve": "CVE-2026-99163",
      "id": "CVE-2026-99163",
      "initial_release_date": "2026-10-28T17:32:57Z",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99163",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99163.json",
      "version": "5"
    }
  }
}



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Sightings

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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.
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  • 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

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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.