{
  "cveId": "CVE-2026-89830",
  "url": "https://patchblox.com/security/cve/CVE-2026-89830",
  "summary": "CVE-2026-89830 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89830, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "f2fs: fix valid block count leak on data block allocation failure",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix valid block count leak on data block allocation failure  In __allocate_data_block(), when allocating a new data block (dn-\u003Edata_blkaddr == NULL_ADDR), inc_valid_block_count() is called first to increment total_valid_block_count and i_blocks. If the subsequent f2fs_allocate_data_block() fails, the function returns the error directly without rolling back the already-incremented block counts, causing a permanent leak.  Fix this by calling dec_valid_block_count() to undo the increment before returning the error. The condition old_blkaddr == NULL_ADDR precisely identifies the case where inc_valid_block_count() was called.",
  "published": "2026-09-16T11:16:49Z",
  "severity": "",
  "epss": 0.00209,
  "epssPercentile": 0.11083,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89830",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-89830",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89830",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89830",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89830",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-89830",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89830",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}