{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47690",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-47690"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "f2fs: get rid of online repaire on corrupted directory",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: get rid of online repaire on corrupted directory\n\nsyzbot reports a f2fs bug as below:\n\nkernel BUG at fs/f2fs/inode.c:896!\nRIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896\nCall Trace:\n evict+0x532/0x950 fs/inode.c:704\n dispose_list fs/inode.c:747 [inline]\n evict_inodes+0x5f9/0x690 fs/inode.c:797\n generic_shutdown_super+0x9d/0x2d0 fs/super.c:627\n kill_block_super+0x44/0x90 fs/super.c:1696\n kill_f2fs_super+0x344/0x690 fs/f2fs/super.c:4898\n deactivate_locked_super+0xc4/0x130 fs/super.c:473\n cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373\n task_work_run+0x24f/0x310 kernel/task_work.c:228\n ptrace_notify+0x2d2/0x380 kernel/signal.c:2402\n ptrace_report_syscall include/linux/ptrace.h:415 [inline]\n ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]\n syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173\n syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]\n __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]\n syscall_exit_to_user_mode+0x279/0x370 kernel/entry/common.c:218\n do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896\n\nOnline repaire on corrupted directory in f2fs_lookup() can generate\ndirty data/meta while racing w/ readonly remount, it may leave dirty\ninode after filesystem becomes readonly, however, checkpoint() will\nskips flushing dirty inode in a state of readonly mode, result in\nabove panic.\n\nLet's get rid of online repaire in f2fs_lookup(), and leave the work\nto fsck.f2fs.",
  "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-2024-47690"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8d64f598eeb079c42a52deaa3a91312c736a49d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4746f2d79507f65cfbde11d3c39ee8338aa50af"
    },
    {
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      "url": "https://git.kernel.org/stable/c/f9ce2f550d53d044ecfb5ce996406cf42cd6b84d"
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      "url": "https://git.kernel.org/stable/c/8be95cd607478d85fa4626e86f811e785905bcbf"
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      "url": "https://git.kernel.org/stable/c/bcefd0b0611f35b560d0a7281d87529fbe7a1e32"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/884ee6dc85b959bc152f15bca80c30f06069e6c4"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached through local filesystem operations \u2014 mounting an f2fs image, ordinary path lookup syscalls, and a remount \u2014 with no network protocol involved. Even in the removable-media/automount scenario the triggering actions are local syscalls, and Local scores higher than Physical.\nAC:L - The attacker controls both sides of the race (a lookup loop against `mount -o remount,ro`) and can repeat it indefinitely until the window is hit; the `f2fs_readonly()` check in `__recover_dot_dentries()` is checked once with no locking against the remount. Setting the on-disk `F2FS_INLINE_DOTS` bit is trivial and requires no special conditions.\nPR:L - Reaching `f2fs_lookup()` and thus `__recover_dot_dentries()` requires only an unprivileged local account with search access to the mount; the flag arrives from disk via a crafted image or a legacy mkfs.f2fs volume that an automount daemon (Android vold, udisks2) mounts on the attacker's behalf. No capability check exists anywhere on the lookup path.\nUI:N - No victim action is needed \u2014 the attacker performs the lookups, remount and unmount itself, and in the removable-media case the automount daemon mounts the volume without any user interaction.\nS:U - The corruption and the resulting panic/use-after-free are confined to the kernel's own memory and the f2fs superblock structures; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the WARN path leaves the evicted inode linked in `sbi->inode_list[DIRTY_META]`, `f2fs_sync_inode_meta()` reads a freed `f2fs_inode_info` via `list_first_entry()` and `igrab()`, giving a use-after-free read of reclaimed slab memory that can be heap-sprayed to disclose kernel data.\nI:H - The same dangling `gdirty_list` entry yields UAF writes through `list_del_init()` in `f2fs_inode_synced()` and `f2fs_update_inode_page()` operating on a reclaimed object, a well-known primitive for heap-spray-based control-flow hijack; the bug additionally leaves persistent on-disk metadata inconsistency requiring fsck.\nA:H - The reported failure is an outright kernel panic at `fs/f2fs/inode.c:896` (`BUG_ON` under CONFIG_F2FS_CHECK_FS, or WARN plus a subsequent use-after-free oops otherwise), triggered on unmount and reproducible on demand."
    }
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}