{
  "cveId": "CVE-2025-40124",
  "url": "https://patchblox.com/security/cve/CVE-2025-40124",
  "summary": "CVE-2025-40124 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40124, released November 12, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sparc: fix accurate exception reporting in copy_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III  Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy.  The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de  The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. The exception handlers expect that %o2 has already been masked during the bulk copy loop, but the masking was performed after that loop. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.",
  "published": "2025-11-12T11:15:41Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00166,
  "epssPercentile": 0.05866,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.158-1",
      "fix": "DEBIAN-CVE-2025-40124",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40124",
      "released": "2025-11-12T11:15:41Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.57-1",
      "fix": "DEBIAN-CVE-2025-40124",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40124",
      "released": "2025-11-12T11:15:41Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.6-1",
      "fix": "DEBIAN-CVE-2025-40124",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40124",
      "released": "2025-11-12T11:15:41Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}