{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31715",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31715"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition.",
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