{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50230",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50230"
  ],
  "published": "2024-11-09T10:15:51Z",
  "summary": "nilfs2: fix kernel bug due to missing clearing of checked flag",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix kernel bug due to missing clearing of checked flag\n\nSyzbot reported that in directory operations after nilfs2 detects\nfilesystem corruption and degrades to read-only,\n__block_write_begin_int(), which is called to prepare block writes, may\nfail the BUG_ON check for accesses exceeding the folio/page size,\ntriggering a kernel bug.\n\nThis was found to be because the \"checked\" flag of a page/folio was not\ncleared when it was discarded by nilfs2's own routine, which causes the\nsanity check of directory entries to be skipped when the directory\npage/folio is reloaded.  So, fix that.\n\nThis was necessary when the use of nilfs2's own page discard routine was\napplied to more than just metadata files.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50230"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/994b2fa13a6c9cf3feca93090a9c337d48e3d60d"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64afad73e4623308d8943645e5631f2c7a2d7971"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa0cee46c5d3fd9a39575a4c8a4f65f25f095b89"
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      "url": "https://git.kernel.org/stable/c/f05dbebb8ee34882505d53d83af7d18f28a49248"
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cd0cdb51b15203fa27d4b714be83b7dfffa0b752"
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    },
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      "url": "https://git.kernel.org/stable/c/56c6171932a7fb267ac6cb4ff8759b93ee1d0e2e"
    },
    {
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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 vulnerable code is reached only through a locally mounted nilfs2 block device \u2014 mount(2) plus ordinary directory syscalls (getdents, creat, unlink, rename) on that mount; no network protocol handler is involved. Attack Vector is Local rather than Physical because the attacker supplies image data (USB stick, disk image, container volume) and need not touch hardware.\nAC:L - The attacker fully controls the crafted nilfs2 image, so they choose the corruption that forces nilfs_error() into read-only degrade, and they can force the discard-then-reload sequence on demand with sync(2)/fsync(2) followed by a directory access. Nothing depends on conditions outside their influence, and the sequence can be retried indefinitely (syzbot reproduces it).\nPR:N - The attacker needs no account or privilege on the target system \u2014 they only supply the crafted nilfs2 medium, and the image can be built so that mount plus routine directory browsing by the victim (file manager readdir/lookup, thumbnailer) drives the corrupted path itself. This matches the established framing for crafted-filesystem-image flaws.\nUI:R - nilfs2 is FS_REQUIRES_DEV with no FS_USERNS_MOUNT, so the crafted image must be mounted by a privileged actor \u2014 a victim inserting the removable medium into a desktop/kiosk with udisks2 automount, an admin mounting a supplied image, or a loop mount inside a container.\nS:U - The out-of-bounds access and the BUG() occur inside the kernel's own memory and locking domain on the same system; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Bypassing nilfs_check_folio() lets nilfs_readdir() pass an unvalidated de->name_len (up to 255) to dir_emit() for an entry only 12 bytes from the folio end, leaking roughly 250 bytes of adjacent kernel heap directly into a userspace getdents() buffer. That is far more than a strictly bounded few-byte read, and it also exposes nilfs2 private metadata inodes through lookup.\nI:H - With the sanity gate skipped, nilfs_add_link() and nilfs_delete_entry() perform entry splitting and merging (de1->rec_len writes, memcpy into de->name, pde->rec_len rewrites) using offsets derived from unvalidated on-disk rec_len/name_len, corrupting directory data and filesystem metadata. The bypassed NILFS_PRIVATE_INODE check further permits directory entries to resolve to nilfs2's DAT/cpfile/sufile/ifile inodes, giving a type-confusion primitive against internal metadata.\nA:H - The reported and primary outcome is BUG_ON(to > folio_size(folio)) in __block_write_begin_int(), a kernel BUG taken while holding the folio lock and directory inode lock, which oopses the task and leaves the filesystem permanently wedged, or panics outright with panic_on_oops."
    }
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}