{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-39813",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39813",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-16T13:00:14.846Z",
    "updatedAt": "2026-05-12T12:07:14.764Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ftrace: Fix potential warning in trace_printk_seq during ftrace_dump",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix potential warning in trace_printk_seq during ftrace_dump\n\nWhen calling ftrace_dump_one() concurrently with reading trace_pipe,\na WARN_ON_ONCE() in trace_printk_seq() can be triggered due to a race\ncondition.\n\nThe issue occurs because:\n\nCPU0 (ftrace_dump)                              CPU1 (reader)\necho z > /proc/sysrq-trigger\n\n!trace_empty(&iter)\ntrace_iterator_reset(&iter) <- len = size = 0\n                                                cat /sys/kernel/tracing/trace_pipe\ntrace_find_next_entry_inc(&iter)\n  __find_next_entry\n    ring_buffer_empty_cpu <- all empty\n  return NULL\n\ntrace_printk_seq(&iter.seq)\n  WARN_ON_ONCE(s->seq.len >= s->seq.size)\n\nIn the context between trace_empty() and trace_find_next_entry_inc()\nduring ftrace_dump, the ring buffer data was consumed by other readers.\nThis caused trace_find_next_entry_inc to return NULL, failing to populate\n`iter.seq`. At this point, due to the prior trace_iterator_reset, both\n`iter.seq.len` and `iter.seq.size` were set to 0. Since they are equal,\nthe WARN_ON_ONCE condition is triggered.\n\nMove the trace_printk_seq() into the if block that checks to make sure the\nreturn value of trace_find_next_entry_inc() is non-NULL in\nftrace_dump_one(), ensuring the 'iter.seq' is properly populated before\nsubsequent operations.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f299353e7ccbcc5c2ed8993c48fbe7609cbe729a"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5ab0ec206deb99eb3baf8f1d7602aeaa91dbcc85"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a6f0f8873cc30fd4543b09adf03f7f51d293f0e6"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e80ff23ba8bdb0f41a1afe2657078e4097d13a9a"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "28c8fb7ae2ad27d81c8de3c4fe608c509f6a18aa"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ced94e137e6cd5e79c65564841d3b7695d0f5fa3"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fbd4cf7ee4db65ef36796769fe978e9eba6f0de4"
            },
            {
              "version": "d769041f865330034131525ee6a7f72eb4af2a24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4013aef2ced9b756a410f50d12df9ebe6a883e4a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.28",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.28"
            },
            {
              "version": "5.4.298",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.242",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.191",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.150",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.104",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.16.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "version": "6.17",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}