{
  "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-2024-35798",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-35798",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-17T13:23:08.868Z",
    "updatedAt": "2026-08-05T11:30:01.532Z",
    "importedAt": "2026-10-24T01:57:11.582Z",
    "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": "btrfs: fix race in read_extent_buffer_pages()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix race in read_extent_buffer_pages()\n\nThere are reports from tree-checker that detects corrupted nodes,\nwithout any obvious pattern so possibly an overwrite in memory.\nAfter some debugging it turns out there's a race when reading an extent\nbuffer the uptodate status can be missed.\n\nTo prevent concurrent reads for the same extent buffer,\nread_extent_buffer_pages() performs these checks:\n\n    /* (1) */\n    if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))\n        return 0;\n\n    /* (2) */\n    if (test_and_set_bit(EXTENT_BUFFER_READING, &eb->bflags))\n        goto done;\n\nAt this point, it seems safe to start the actual read operation. Once\nthat completes, end_bbio_meta_read() does\n\n    /* (3) */\n    set_extent_buffer_uptodate(eb);\n\n    /* (4) */\n    clear_bit(EXTENT_BUFFER_READING, &eb->bflags);\n\nNormally, this is enough to ensure only one read happens, and all other\ncallers wait for it to finish before returning.  Unfortunately, there is\na racey interleaving:\n\n    Thread A | Thread B | Thread C\n    ---------+----------+---------\n       (1)   |          |\n             |    (1)   |\n       (2)   |          |\n       (3)   |          |\n       (4)   |          |\n             |    (2)   |\n             |          |    (1)\n\nWhen this happens, thread B kicks of an unnecessary read. Worse, thread\nC will see UPTODATE set and return immediately, while the read from\nthread B is still in progress.  This race could result in tree-checker\nerrors like this as the extent buffer is concurrently modified:\n\n    BTRFS critical (device dm-0): corrupted node, root=256\n    block=8550954455682405139 owner mismatch, have 11858205567642294356\n    expect [256, 18446744073709551360]\n\nFix it by testing UPTODATE again after setting the READING bit, and if\nit's been set, skip the unnecessary read.\n\n[ minor update of changelog ]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d7172f52e9933b6ec9305e7fe6e829e3939dba04",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0427c8ef8bbb7f304de42ef51d69c960e165e052"
            },
            {
              "version": "d7172f52e9933b6ec9305e7fe6e829e3939dba04",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3a25878a3378adce5d846300c9570f15aa7f7a80"
            },
            {
              "version": "d7172f52e9933b6ec9305e7fe6e829e3939dba04",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2885d54af2c2e1d910e20d5c8045bae40e02fbc1"
            },
            {
              "version": "d7172f52e9933b6ec9305e7fe6e829e3939dba04",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ef1e68236b9153c27cb7cf29ead0c532870d4215"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.5",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.5"
            },
            {
              "version": "6.6.24",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.7.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.7.*"
            },
            {
              "version": "6.8.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.8.*"
            },
            {
              "version": "6.9",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}