{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46078",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46078"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "erofs: fix the out-of-bounds nameoff handling for trailing dirents",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix the out-of-bounds nameoff handling for trailing dirents\n\nCurrently we already have boundary-checks for nameoffs, but the trailing\ndirents are special since the namelens are calculated with strnlen()\nwith unchecked nameoffs.\n\nIf a crafted EROFS has a trailing dirent with nameoff >= maxsize,\nmaxsize - nameoff can underflow, causing strnlen() to read past the\ndirectory block.\n\nnameoff0 should also be verified to be a multiple of\n`sizeof(struct erofs_dirent)` as well [1].\n\n[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46078"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a8ee527807f7d97e55ce2ef2906f7f34975eb1c7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa16dca1b062355181ef215229eeac249d7c0d61"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/80a23c6d1aba35be8746d74ac14e6ba5ae46da21"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214"
    },
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      "url": "https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575"
    }
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is triggered by parsing a maliciously crafted EROFS filesystem image during a directory read; the data is processed locally after the image is presented (file/loop/removable media), with no network reachability for the readdir path.\nAC:L - An attacker fully controls the on-disk `nameoff` field of the trailing dirent in the crafted image, so the unsigned underflow and resulting out-of-bounds `strnlen` are reproduced deterministically every time the directory is read.\nPR:N - Once the crafted image is mounted, triggering the bug requires only an ordinary directory listing (getdents/readdir), which needs no special privileges; this matches the sibling crafted-image EROFS CVE-2026-43166.\nUI:R - EROFS lacks FS_USERNS_MOUNT and requires CAP_SYS_ADMIN to mount, so a separate user/automounter must mount the attacker-supplied image before the vulnerable readdir path can execute.\nS:U - The out-of-bounds access stays within the kernel's own memory and security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The underflowed length drives an unbounded `strnlen` that reads kernel memory far past the directory-block buffer; per the OOB-read guidance this unbounded read is High.\nI:N - The defect is strictly a read (strnlen over adjacent memory); no out-of-bounds write, use-after-free, or type confusion occurs, so no data can be modified.\nA:H - Scanning up to ~4 GB past the buffer readily walks into unmapped memory, producing a kernel oops/panic and denial of service."
    }
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}