{
  "cveId": "CVE-2026-98124",
  "url": "https://patchblox.com/security/cve/CVE-2026-98124",
  "summary": "CVE-2026-98124 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98124, released October 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "smb/client: invalidate fscache for fallocate range operations",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smb/client: invalidate fscache for fallocate range operations  smb3_zero_range(), smb3_punch_hole(), smb3_insert_range(), and smb3_collapse_range() modify file contents through server-side range operations. These operations discard the affected page cache, but leave the FS-Cache cookie valid, so a later read may return data cached before the range operation.  Fix this by invalidating FS-Cache after outstanding I/O has completed and before modifying the file on the server.  Run the following as root on a CIFS mount with fsc enabled and an active CacheFiles backend:          bash -c \u0027                 MNT=/mnt/cifs                 FILE=\u0022$MNT/repro\u0022                  # Generate four 1 MiB random blocks: [A][B][C][D].                 dd if=/dev/urandom of=/tmp/src bs=1M count=4 status=none                  # Expected contents after zeroing B: [A][zero][C][D].                 cp /tmp/src /tmp/expected                 dd if=/dev/zero of=/tmp/expected bs=1M seek=1 count=1 \\                         conv=notrunc status=none                 cp /tmp/src \u0022$FILE\u0022                  # Populate FS-Cache, then discard the page cache.                 sync                 echo 1 \u003E /proc/sys/vm/drop_caches                 cat \u0022$FILE\u0022 \u003E /dev/null                 sync                 echo 1 \u003E /proc/sys/vm/drop_caches                  fallocate --zero-range -o 1M -l 1M \u0022$FILE\u0022                  if cmp -s /tmp/expected \u0022$FILE\u0022; then                         echo \u0022readback: OK\u0022                 else                         echo \u0022readback: STALE DATA\u0022                 fi         \u0027  Before this change, the readback differs from /tmp/expected:          readback: STALE DATA  After this change, it matches:          readback: OK",
  "published": "2026-09-25T11:17:43Z",
  "severity": "Low",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00186,
  "epssPercentile": 0.08258,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98124",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-98124",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98124",
      "released": "2026-10-02T21:04:56Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98124",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98124",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}