{
  "cveId": "CVE-2026-89678",
  "url": "https://patchblox.com/security/cve/CVE-2026-89678",
  "summary": "CVE-2026-89678 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89678 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix partial-write detection in nfsd_direct...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: fix partial-write detection in nfsd_direct_write  nfsd_direct_write() walks a list of write segments and, after each vfs_iocb_iter_write(), tries to detect a short write so the loop can stop before placing the next segment at a wrong file offset:      host_err = vfs_iocb_iter_write(file, kiocb, \u0026segments[i].iter);     if (host_err \u003C 0)             return host_err;     *cnt \u002B= host_err;     if (host_err \u003C segments[i].iter.count)             break;\t/* partial write */  vfs_iocb_iter_write() runs the iter through -\u003Ewrite_iter(), which advances the iter by the number of bytes written. By the time the check runs, segments[i].iter.count is the residual, not the original request length:      before write_iter: iter.count == original_len     after  write_iter: iter.count == original_len - host_err  The condition then reduces to host_err \u003C original_len - host_err, so the break fires only when less than half of the segment was written. Any short write completing between 50% and 99% of the segment slips through; the loop advances to the next segment with kiocb-\u003Eki_pos only bumped by the short amount, writing the next segment\u0027s payload at the wrong offset and over-reporting *cnt to the NFS client.  Snapshot the segment\u0027s byte count before the write and compare host_err against that snapshot so any short write breaks the loop.",
  "published": "2026-09-11T20:19:54Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss": 0.0038,
  "epssPercentile": 0.32212,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89678",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89678",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}