{
  "cveId": "CVE-2024-44976",
  "url": "https://patchblox.com/security/cve/CVE-2024-44976",
  "summary": "CVE-2024-44976 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-44976, released September 4, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ata: pata_macio: Fix DMA table overflow  Kolbj\u00F8r...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ata: pata_macio: Fix DMA table overflow  Kolbj\u00F8rn and Jon\u00E1\u0161 reported that their 32-bit PowerMacs were crashing in pata-macio since commit 09fe2bfa6b83 (\u0022ata: pata_macio: Fix max_segment_size with PAGE_SIZE == 64K\u0022).  For example:    kernel BUG at drivers/ata/pata_macio.c:544!   Oops: Exception in kernel mode, sig: 5 [#1]   BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 DEBUG_PAGEALLOC PowerMac   ...   NIP pata_macio_qc_prep\u002B0xf4/0x190   LR  pata_macio_qc_prep\u002B0xfc/0x190   Call Trace:     0xc1421660 (unreliable)     ata_qc_issue\u002B0x14c/0x2d4     __ata_scsi_queuecmd\u002B0x200/0x53c     ata_scsi_queuecmd\u002B0x50/0xe0     scsi_queue_rq\u002B0x788/0xb1c     __blk_mq_issue_directly\u002B0x58/0xf4     blk_mq_plug_issue_direct\u002B0x8c/0x1b4     blk_mq_flush_plug_list.part.0\u002B0x584/0x5e0     __blk_flush_plug\u002B0xf8/0x194     __submit_bio\u002B0x1b8/0x2e0     submit_bio_noacct_nocheck\u002B0x230/0x304     btrfs_work_helper\u002B0x200/0x338     process_one_work\u002B0x1a8/0x338     worker_thread\u002B0x364/0x4c0     kthread\u002B0x100/0x104     start_kernel_thread\u002B0x10/0x14  That commit increased max_segment_size to 64KB, with the justification that the SCSI core was already using that size when PAGE_SIZE == 64KB, and that there was existing logic to split over-sized requests.  However with a sufficiently large request, the splitting logic causes each sg to be split into two commands in the DMA table, leading to overflow of the DMA table, triggering the BUG_ON().  With default settings the bug doesn\u0027t trigger, because the request size is limited by max_sectors_kb == 1280, however max_sectors_kb can be increased, and apparently some distros do that by default using udev rules.  Fix the bug for 4KB kernels by reverting to the old max_segment_size.  For 64KB kernels the sg_tablesize needs to be halved, to allow for the possibility that each sg will be split into two.",
  "published": "2024-09-04T20:15:07Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00196,
  "epssPercentile": 0.09322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.10.7-1",
      "fix": "DEBIAN-CVE-2024-44976",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-44976",
      "released": "2024-09-04T20:15:07Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.10.7-1",
      "fix": "DEBIAN-CVE-2024-44976",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-44976",
      "released": "2024-09-04T20:15:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}