{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56619",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56619"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()\n\nSyzbot reported that when searching for records in a directory where the\ninode's i_size is corrupted and has a large value, memory access outside\nthe folio/page range may occur, or a use-after-free bug may be detected if\nKASAN is enabled.\n\nThis is because nilfs_last_byte(), which is called by nilfs_find_entry()\nand others to calculate the number of valid bytes of directory data in a\npage from i_size and the page index, loses the upper 32 bits of the 64-bit\nsize information due to an inappropriate type of local variable to which\nthe i_size value is assigned.\n\nThis caused a large byte offset value due to underflow in the end address\ncalculation in the calling nilfs_find_entry(), resulting in memory access\nthat exceeds the folio/page size.\n\nFix this issue by changing the type of the local variable causing the bit\nloss from \"unsigned int\" to \"u64\".  The return value of nilfs_last_byte()\nis also of type \"unsigned int\", but it is truncated so as not to exceed\nPAGE_SIZE and no bit loss occurs, so no change is required.",
  "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-2024-56619"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3"
    },
    {
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      "url": "https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951"
    },
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      "url": "https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f"
    },
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      "url": "https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d"
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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 triggered through local filesystem operations (lookup, unlink, rename, getdents) on a mounted nilfs2 image with a corrupted directory i_size; no network protocol handler is involved.\nAC:L - The truncation and subsequent unsigned underflow are fully deterministic once the crafted i_size is present \u2014 a single lookup or readdir on the directory reliably walks past the folio, with no race or unpredictable precondition.\nPR:L - An unprivileged local user can supply and mount a crafted nilfs2 image via removable-media automount (udisks2) and then trigger the OOB with ordinary directory operations; no elevated capability is needed for the triggering syscalls.\nUI:N - Once the attacker-controlled filesystem is mounted, the attacker triggers the flaw entirely on their own with a lookup/readdir/unlink; no separate victim action is required.\nS:U - The out-of-bounds access and its consequences remain within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - nilfs_readdir() emits names and inode numbers read from out-of-bounds kernel memory directly to userspace via dir_emit(), giving a repeatable kernel heap disclosure primitive.\nI:H - A name match in out-of-bounds memory lets nilfs_delete_entry() write dir->inode = 0 and pde->rec_len at an attacker-groomable location outside the folio, an out-of-bounds write usable for control-flow corruption.\nA:H - The unbounded ~4 GB scan limit causes access past the folio into unmapped memory, producing a kernel oops/panic (and KASAN use-after-free reports), as observed by syzbot."
    }
  }
}