{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56596",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56596"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "jfs: fix array-index-out-of-bounds in jfs_readdir",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix array-index-out-of-bounds in jfs_readdir\n\nThe stbl might contain some invalid values. Added a check to\nreturn error code in that case.",
  "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-2024-56596"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b62f41aeec9d250144c53875b507c1d45ae8c8fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97e693593162eef6851d232f0c8148169ed46a5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9efe72eefd4c4a7ce63b3e4d667d766d2b360cb4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff9fc48fab0e1ea0d423c23c99b91bba178f0b05"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7d376f94f72b020f84e77278b150ec1cc27502c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ff7579554571d92e3deab168f5a7d7b146ed368"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/839f102efb168f02dfdd46717b7c6dddb26b015e"
    }
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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 bug is triggered by a local `getdents64()`/readdir on a directory of a mounted JFS filesystem whose dtree page contains a negative `stbl[]` entry; there is no network-facing path into `jfs_readdir()`. Delivery of the crafted image is via local/removable media, so the vector is Local.\nAC:L - The attacker fully controls the on-disk image and can deterministically set `stbl[i]` to a negative value; no race, no memory-layout guess, and no condition outside attacker control is involved. Any directory listing of the crafted directory reliably triggers the out-of-bounds access.\nPR:N - The attacker needs no privileges or account on the target system \u2014 they only supply a malicious JFS image (e.g. USB media), and the subsequent `readdir` requires nothing beyond ordinary directory read permission. JFS is `FS_REQUIRES_DEV` without `FS_USERNS_MOUNT`, so mounting is done by the victim/automounter rather than by the attacker.\nUI:R - The crafted filesystem must be mounted by a user or automounter (udisks/desktop automount on kiosks and workstations) before the directory can be read. That mount action is the required user interaction.\nS:U - The out-of-bounds read and write stay within the kernel's own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 4 KB of kernel memory preceding the dtree metapage or the `jfs_inode_info` slab object is read and then emitted to userspace as directory entry names and inode numbers via `dir_emit()`, giving a directly harvestable disclosure of adjacent heap contents including potential pointers and secrets.\nI:H - The same unvalidated negative index flows into `add_missing_indices()`, which performs `d->index = cpu_to_le32(add_index(...))` \u2014 a 4-byte out-of-bounds write at attacker-chosen negative offset \u2014 and stores the bad offset into the transaction linelock, corrupting adjacent kernel objects and journal metadata.\nA:H - Reading and writing up to 4 KB outside the metapage/slab object readily hits unmapped or poisoned memory, producing the KASAN-reported oops/panic seen by syzbot, and the stray write corrupts filesystem and journal state."
    }
  }
}