{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56692",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56692"
  ],
  "published": "2024-12-28T09:46:17Z",
  "summary": "f2fs: fix to do sanity check on node blkaddr in truncate_node()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on node blkaddr in truncate_node()\n\nsyzbot reports a f2fs bug as below:\n\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/segment.c:2534!\nRIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534\nCall Trace:\n truncate_node+0x1ae/0x8c0 fs/f2fs/node.c:909\n f2fs_remove_inode_page+0x5c2/0x870 fs/f2fs/node.c:1288\n f2fs_evict_inode+0x879/0x15c0 fs/f2fs/inode.c:856\n evict+0x4e8/0x9b0 fs/inode.c:723\n f2fs_handle_failed_inode+0x271/0x2e0 fs/f2fs/inode.c:986\n f2fs_create+0x357/0x530 fs/f2fs/namei.c:394\n lookup_open fs/namei.c:3595 [inline]\n open_last_lookups fs/namei.c:3694 [inline]\n path_openat+0x1c03/0x3590 fs/namei.c:3930\n do_filp_open+0x235/0x490 fs/namei.c:3960\n do_sys_openat2+0x13e/0x1d0 fs/open.c:1415\n do_sys_open fs/open.c:1430 [inline]\n __do_sys_openat fs/open.c:1446 [inline]\n __se_sys_openat fs/open.c:1441 [inline]\n __x64_sys_openat+0x247/0x2a0 fs/open.c:1441\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534\n\nThe root cause is: on a fuzzed image, blkaddr in nat entry may be\ncorrupted, then it will cause system panic when using it in\nf2fs_invalidate_blocks(), to avoid this, let's add sanity check on\nnat blkaddr in truncate_node().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56692"
    },
    {
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      "url": "https://git.kernel.org/stable/c/27d6e7eff07f8cce8e83b162d8f21a07458c860d"
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    "upstream_modified": "2026-08-05T11:52:36Z",
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      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The attack requires a crafted f2fs image to be mounted on the local system and is then triggered through ordinary local filesystem syscalls (`openat`, `unlink`, `truncate`) reaching `truncate_node()`; no network protocol is involved.\nAC:L - The corrupted `block_addr` is a static, fully attacker-chosen field in the on-disk NAT journal that `remove_nats_in_journal()` copies into the NAT cache verbatim, so `truncate_node()` picks it up deterministically on every node truncation \u2014 no race, no timing window, and no dependence on memory layout the attacker cannot influence.\nPR:L - Once the malicious volume is mounted \u2014 automatically by udisks2 on desktops/kiosks or by vold for Android SD-card/adoptable storage, since f2fs is Android's primary filesystem \u2014 any unprivileged user with access to the mount triggers the path with a plain file create, unlink, or truncate; no capability check stands between that user and `truncate_node()`.\nUI:N - The attacker performs both halves of the attack: the volume is mounted automatically on media insertion by the automounter, and the trigger is the attacker's own ordinary file operation, requiring no action by any victim.\nS:U - The out-of-bounds accesses and the resulting corruption are confined to kernel memory of the same machine; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - `get_seg_entry()` indexes `sit_i->sentries[]` with an unbounded `segno` derived from the attacker's 32-bit blkaddr and performs no bounds check, so `update_segment_mtime()`/`update_sit_entry()` read `struct seg_entry` fields \u2014 including the `cur_valid_map`/`ckpt_valid_map`/`discard_map` pointers \u2014 from arbitrary kernel memory far outside the array.\nI:H - The same unbounded index produces out-of-bounds writes to `se->mtime`, `se->valid_blocks`, the `dirty_sentries_bitmap` bit set by `__mark_sit_entry_dirty()`, and `get_sec_entry()->valid_blocks`, plus a bit-clear performed through `se->cur_valid_map` \u2014 a pointer that was itself read out of bounds \u2014 giving a wild-pointer write primitive suitable for control-flow hijacking.\nA:H - The reported symptom is an outright kernel panic at `f2fs_bug_on(sbi, addr == NULL_ADDR)` in `f2fs_invalidate_blocks()` (`BUG_ON` under `CONFIG_F2FS_CHECK_FS`, `WARN_ON` elsewhere, fatal with `panic_on_warn`), and the out-of-bounds pointer dereferences oops the kernel independently."
    }
  }
}