{
  "cveId": "CVE-2025-40245",
  "url": "https://patchblox.com/security/cve/CVE-2025-40245",
  "summary": "CVE-2025-40245 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40245, released December 4, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nios2: ensure that memblock.current_limit is set when setting pfn limits",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nios2: ensure that memblock.current_limit is set when setting pfn limits  On nios2, with CONFIG_FLATMEM set, the kernel relies on memblock_get_current_limit() to determine the limits of mem_map, in particular for max_low_pfn. Unfortunately, memblock.current_limit is only default initialized to MEMBLOCK_ALLOC_ANYWHERE at this point of the bootup, potentially leading to situations where max_low_pfn can erroneously exceed the value of max_pfn and, thus, the valid range of available DRAM.  This can in turn cause kernel-level paging failures, e.g.:  [   76.900000] Unable to handle kernel paging request at virtual address 20303000 [   76.900000] ea = c0080890, ra = c000462c, cause = 14 [   76.900000] Kernel panic - not syncing: Oops [   76.900000] ---[ end Kernel panic - not syncing: Oops ]---  This patch fixes this by pre-calculating memblock.current_limit based on the upper limits of the available memory ranges via adjust_lowmem_bounds, a simplified version of the equivalent implementation within the arm architecture.",
  "published": "2025-12-04T16:16:17Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00164,
  "epssPercentile": 0.0569,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40245",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.158-1",
      "fix": "DEBIAN-CVE-2025-40245",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40245",
      "released": "2025-12-04T16:16:17Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.57-1",
      "fix": "DEBIAN-CVE-2025-40245",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40245",
      "released": "2025-12-04T16:16:17Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.6-1",
      "fix": "DEBIAN-CVE-2025-40245",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40245",
      "released": "2025-12-04T16:16:17Z"
    }
  ],
  "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"
  }
}