{
  "cveId": "CVE-2026-53018",
  "url": "https://patchblox.com/security/cve/CVE-2026-53018",
  "summary": "CVE-2026-53018 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-53018, released June 25, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "f2fs: avoid reading already updated pages during GC",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: avoid reading already updated pages during GC  We found the following issue during fuzz testing:  page: refcount:3 mapcount:0 mapping:00000000b6e89c65 index:0x18b2dc pfn:0x161ba9 memcg:f8ffff800e269c00 aops:f2fs_meta_aops ino:2 flags: 0x52880000000080a9(locked|waiters|uptodate|lru|private|zone=1|kasantag=0x4a) raw: 52880000000080a9 fffffffec6e17588 fffffffec0ccc088 a7ffff8067063618 raw: 000000000018b2dc 0000000000000009 00000003ffffffff f8ffff800e269c00 page dumped because: VM_BUG_ON_FOLIO(folio_test_uptodate(folio)) page_owner tracks the page as allocated  post_alloc_hook\u002B0x58c/0x5ec  prep_new_page\u002B0x34/0x284  get_page_from_freelist\u002B0x2dcc/0x2e8c  __alloc_pages_noprof\u002B0x280/0x76c  __folio_alloc_noprof\u002B0x18/0xac  __filemap_get_folio\u002B0x6bc/0xdc4  pagecache_get_page\u002B0x3c/0x104  do_garbage_collect\u002B0x5c78/0x77a4  f2fs_gc\u002B0xd74/0x25f0  gc_thread_func\u002B0xb28/0x2930  kthread\u002B0x464/0x5d8  ret_from_fork\u002B0x10/0x20 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:1563!  folio_end_read\u002B0x140/0x168  f2fs_finish_read_bio\u002B0x5c4/0xb80  f2fs_read_end_io\u002B0x64c/0x708  bio_endio\u002B0x85c/0x8c0  blk_update_request\u002B0x690/0x127c  scsi_end_request\u002B0x9c/0xb8c  scsi_io_completion\u002B0xf0/0x250  scsi_finish_command\u002B0x430/0x45c  scsi_complete\u002B0x178/0x6d4  blk_mq_complete_request\u002B0xcc/0x104  scsi_done_internal\u002B0x214/0x454  scsi_done\u002B0x24/0x34  which is similar to the problem reported by syzbot: https://syzkaller.appspot.com/bug?extid=3686758660f980b402dc  This case is consistent with the description in commit 9bf1a3f (\u0022f2fs: avoid GC causing encrypted file corrupted\u0022): Page 1 is moved from blkaddr A to blkaddr B by move_data_block, and after being written it is marked as uptodate. Then, Page 1 is moved from blkaddr B to blkaddr C, VM_BUG_ON_FOLIO was triggered in the endio initiated by ra_data_block.  There is no need to read Page 1 again from blkaddr B, since it has already been updated. Therefore, avoid initiating I/O in this case.",
  "published": "2026-06-24T17:17:13Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00162,
  "epssPercentile": 0.05467,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53018",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-53018",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53018",
      "released": "2026-06-25T17:23:13Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.10-1",
      "fix": "DEBIAN-CVE-2026-53018",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53018",
      "released": "2026-06-25T17:23:13Z"
    }
  ],
  "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"
  }
}