{
  "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-2026-74601",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74601",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-22T15:31:50.092Z",
    "updatedAt": "2026-10-16T19:06:00.447Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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": "ring-buffer: Use current_context for safe per-CPU buffer swap",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Use current_context for safe per-CPU buffer swap\n\nThe ring_buffer_swap_cpu() function currently checks the per-CPU\ncommitting counter to determine if a buffer is actively being written to\nbefore performing the swap. However, there exists a race window where\nthis check can be bypassed:\n\n    ring_buffer_lock_reserve\n        cpu_buffer = buffer->buffers[cpu];       // cpu_buffer_a\n        rb_reserve_next_event\n            rb_start_commit // inc committing\n            if (unlikely(READ_ONCE(cpu_buffer->buffer) != buffer)) {...}\n            __rb_reserve_next\n                rb_move_tail\n                    rb_end_commit(cpu_buffer);   // dec committing => 0\n                    /* interrupt hits here, successfully swaps! */\n                    local_inc(&cpu_buffer->committing);\n\n    ring_buffer_unlock_commit\n        cpu_buffer = buffer->buffers[cpu];      // cpu_buffer_b\n        rb_commit\n            rb_end_commit\n            RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing))\n                                                // triggers warning\n\nThe committing counter can temporarily drop to 0 during a single write\noperation (within rb_move_tail), creating a window where swap can\nsucceed even though the write is still in progress. This leads to\ninconsistent buffer state and triggers the RB_WARN_ON in rb_commit().\n\nReplace the committing counter check with current_context checks, which\nare set at the entry of ring_buffer_lock_reserve() and remain valid\nthroughout the entire write operation, providing a reliable indicator of\nbuffer busy state during swap.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "26662bc8fced1d668fa1aa146eda085bfc67bd0b"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6b524e6b234e45c7f5f90d13b042c6f57f80105c"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "597f279b7b4a06412e3d965e98cc36e181cdbede"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "22709117d9ae95e52673685f98caac7c356a8227"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad7e10c7ea89af45ac1bf1814855d45da472703d"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5b926fb04cb9ef3156dcf88c69a59d3d1a1c4f9f"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5e6e2a18c20e88167d414f666032792e8bf19b80"
            },
            {
              "version": "4239c38fe0b3847e1e6d962c74b41b08ba0e2990",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f27bdc43077e4fcb5557dfc315ee8d91e741f483"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.5",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.5"
            },
            {
              "version": "5.10.266",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.217",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.184",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.153",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.105",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}