{
  "cveId": "CVE-2025-38218",
  "url": "https://patchblox.com/security/cve/CVE-2025-38218",
  "summary": "CVE-2025-38218 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-38218, released July 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "f2fs: fix to do sanity check on sit_bitmap_size",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to do sanity check on sit_bitmap_size  w/ below testcase, resize will generate a corrupted image which contains inconsistent metadata, so when mounting such image, it will trigger kernel panic:  touch img truncate -s $((512*1024*1024*1024)) img mkfs.f2fs -f img $((256*1024*1024)) resize.f2fs -s -i img -t $((1024*1024*1024)) mount img /mnt/f2fs  ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.h:863! Oops: invalid opcode: 0000 [#1] SMP PTI CPU: 11 UID: 0 PID: 3922 Comm: mount Not tainted 6.15.0-rc1\u002B #191 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:f2fs_ra_meta_pages\u002B0x47c/0x490  Call Trace:  f2fs_build_segment_manager\u002B0x11c3/0x2600  f2fs_fill_super\u002B0xe97/0x2840  mount_bdev\u002B0xf4/0x140  legacy_get_tree\u002B0x2b/0x50  vfs_get_tree\u002B0x29/0xd0  path_mount\u002B0x487/0xaf0  __x64_sys_mount\u002B0x116/0x150  do_syscall_64\u002B0x82/0x190  entry_SYSCALL_64_after_hwframe\u002B0x76/0x7e RIP: 0033:0x7fdbfde1bcfe  The reaseon is:  sit_i-\u003Ebitmap_size is 192, so size of sit bitmap is 192*8=1536, at maximum there are 1536 sit blocks, however MAIN_SEGS is 261893, so that sit_blk_cnt is 4762, build_sit_entries() -\u003E current_sit_addr() tries to access out-of-boundary in sit_bitmap at offset from [1536, 4762), once sit_bitmap and sit_bitmap_mirror is not the same, it will trigger f2fs_bug_on().  Let\u0027s add sanity check in f2fs_sanity_check_ckpt() to avoid panic.",
  "published": "2025-07-04T14:15:30Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0019,
  "epssPercentile": 0.08744,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38218",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.147-1",
      "fix": "DEBIAN-CVE-2025-38218",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38218",
      "released": "2025-07-04T14:15:30Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.35-1",
      "fix": "DEBIAN-CVE-2025-38218",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38218",
      "released": "2025-07-04T14:15:30Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.12.35-1",
      "fix": "DEBIAN-CVE-2025-38218",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38218",
      "released": "2025-07-04T14:15:30Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}