{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22123",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-22123"
  ],
  "published": "2025-04-16T14:14:59Z",
  "summary": "f2fs: fix to avoid accessing uninitialized curseg",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid accessing uninitialized curseg\n\nsyzbot reports a f2fs bug as below:\n\nF2FS-fs (loop3): Stopped filesystem due to reason: 7\nkworker/u8:7: attempt to access beyond end of device\nBUG: unable to handle page fault for address: ffffed1604ea3dfa\nRIP: 0010:get_ckpt_valid_blocks fs/f2fs/segment.h:361 [inline]\nRIP: 0010:has_curseg_enough_space fs/f2fs/segment.h:570 [inline]\nRIP: 0010:__get_secs_required fs/f2fs/segment.h:620 [inline]\nRIP: 0010:has_not_enough_free_secs fs/f2fs/segment.h:633 [inline]\nRIP: 0010:has_enough_free_secs+0x575/0x1660 fs/f2fs/segment.h:649\n <TASK>\n f2fs_is_checkpoint_ready fs/f2fs/segment.h:671 [inline]\n f2fs_write_inode+0x425/0x540 fs/f2fs/inode.c:791\n write_inode fs/fs-writeback.c:1525 [inline]\n __writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745\n writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976\n wb_writeback+0x413/0xb80 fs/fs-writeback.c:2156\n wb_do_writeback fs/fs-writeback.c:2303 [inline]\n wb_workfn+0x410/0x1080 fs/fs-writeback.c:2343\n process_one_work kernel/workqueue.c:3236 [inline]\n process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317\n worker_thread+0x870/0xd30 kernel/workqueue.c:3398\n kthread+0x7a9/0x920 kernel/kthread.c:464\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nCommit 8b10d3653735 (\"f2fs: introduce FAULT_NO_SEGMENT\") allows to trigger\nno free segment fault in allocator, then it will update curseg->segno to\nNULL_SEGNO, though, CP_ERROR_FLAG has been set, f2fs_write_inode() missed\nto check the flag, and access invalid curseg->segno directly in below call\npath, then resulting in panic:\n\n- f2fs_write_inode\n - f2fs_is_checkpoint_ready\n  - has_enough_free_secs\n   - has_not_enough_free_secs\n    - __get_secs_required\n     - has_curseg_enough_space\n      - get_ckpt_valid_blocks\n      : access invalid curseg->segno\n\nTo avoid this issue, let's:\n- check CP_ERROR_FLAG flag in prior to f2fs_is_checkpoint_ready() in\nf2fs_write_inode().\n- in has_curseg_enough_space(), save curseg->segno into a temp variable,\nand verify its validation before use.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.33"
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        "name": "linux"
      },
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        "1:6.12.19-1+rpt1",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-22123"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf49527089ec1ba894c6e587affabbfb2329f52e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7f90e5d423cd2d4c74b2abb527872f335108637f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/986c50f6bca109c6cf362b4e2babcb85aba958f6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}