{
  "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-2024-44976",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-44976",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-09-04T19:54:28.282Z",
    "updatedAt": "2026-05-11T20:33:03.774Z",
    "importedAt": "2026-10-24T01:57:16.009Z",
    "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": "ata: pata_macio: Fix DMA table overflow",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: pata_macio: Fix DMA table overflow\n\nKolbjørn and Jonáš reported that their 32-bit PowerMacs were crashing\nin pata-macio since commit 09fe2bfa6b83 (\"ata: pata_macio: Fix\nmax_segment_size with PAGE_SIZE == 64K\").\n\nFor example:\n\n  kernel BUG at drivers/ata/pata_macio.c:544!\n  Oops: Exception in kernel mode, sig: 5 [#1]\n  BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 DEBUG_PAGEALLOC PowerMac\n  ...\n  NIP pata_macio_qc_prep+0xf4/0x190\n  LR  pata_macio_qc_prep+0xfc/0x190\n  Call Trace:\n    0xc1421660 (unreliable)\n    ata_qc_issue+0x14c/0x2d4\n    __ata_scsi_queuecmd+0x200/0x53c\n    ata_scsi_queuecmd+0x50/0xe0\n    scsi_queue_rq+0x788/0xb1c\n    __blk_mq_issue_directly+0x58/0xf4\n    blk_mq_plug_issue_direct+0x8c/0x1b4\n    blk_mq_flush_plug_list.part.0+0x584/0x5e0\n    __blk_flush_plug+0xf8/0x194\n    __submit_bio+0x1b8/0x2e0\n    submit_bio_noacct_nocheck+0x230/0x304\n    btrfs_work_helper+0x200/0x338\n    process_one_work+0x1a8/0x338\n    worker_thread+0x364/0x4c0\n    kthread+0x100/0x104\n    start_kernel_thread+0x10/0x14\n\nThat commit increased max_segment_size to 64KB, with the justification\nthat the SCSI core was already using that size when PAGE_SIZE == 64KB,\nand that there was existing logic to split over-sized requests.\n\nHowever with a sufficiently large request, the splitting logic causes\neach sg to be split into two commands in the DMA table, leading to\noverflow of the DMA table, triggering the BUG_ON().\n\nWith default settings the bug doesn't trigger, because the request size\nis limited by max_sectors_kb == 1280, however max_sectors_kb can be\nincreased, and apparently some distros do that by default using udev\nrules.\n\nFix the bug for 4KB kernels by reverting to the old max_segment_size.\n\nFor 64KB kernels the sg_tablesize needs to be halved, to allow for the\npossibility that each sg will be split into two.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "09fe2bfa6b83f865126ce3964744863f69a4a030",
              "status": "affected",
              "versionType": "git",
              "lessThan": "709e4c8f78e156ab332297bdd87527ec3da4e2d4"
            },
            {
              "version": "09fe2bfa6b83f865126ce3964744863f69a4a030",
              "status": "affected",
              "versionType": "git",
              "lessThan": "822c8020aebcf5804a143b891e34f29873fee5e2"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.10",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.10"
            },
            {
              "version": "6.10.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.10.*"
            },
            {
              "version": "6.11",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}