{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56597",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56597"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "jfs: fix shift-out-of-bounds in dbSplit",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix shift-out-of-bounds in dbSplit\n\nWhen dmt_budmin is less than zero, it causes errors\nin the later stages. Added a check to return an error beforehand\nin dbAllocCtl itself.",
  "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-2024-56597"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbb24ce7f06ef9b7c05beb9340787cbe9fd3d08e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/df7c76636952670b31bd6c12b3aed3c502122273"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6676034aa753aa448beb30dbd75630927ba7cd96"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/51a203470f502a64a3da8dcea51c4748e8267a6c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c56245baf3fd1f79145dd7408e3ead034b74255c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/52756a57e978e2706543a254f88f266cc6702f36"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d"
    }
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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 poisoned `dmt_budmin` byte only reaches `dbSplit()` after a local mount of an attacker-supplied JFS image or block device, via loop mount or removable media; there is no network or adjacent-network path into the JFS block allocator.\nAC:L - `budmin` is a single s8 field in the on-disk dmap page that the attacker sets directly in the crafted image, and any subsequent block allocation deterministically drives `dbAllocCtl() \u2192 dbAllocDmapLev() \u2192 dbAllocDmap() \u2192 dbAllocBits() \u2192 dbSplit()`; no race, timing, or memory-layout condition outside the attacker's control is involved.\nPR:L - An unprivileged local user gets an attacker-crafted image mounted through loop devices or desktop/kiosk automounters (udisks2, systemd) that mount removable media on their behalf, and this is how the repo scores equivalent on-disk validation bugs (CVE-2025-22079, CVE-2024-56692, CVE-2024-58094).\nUI:N - In the automount/loop scenario the attacker performs both the mount and the subsequent write that triggers block allocation, so no separate victim action is required.\nS:U - The corrupted dmap summary tree, the out-of-range indices, and any resulting crash all remain inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The undefined `1 << (cursz - budmin)` shift yields out-of-range buddy indices that are used to index the dmap summary tree, and on the paired free path `dbJoin()` dereferences `leaf[leafno ^ budsz]` with no bounds check at all, giving out-of-bounds reads of kernel memory adjacent to the metapage.\nI:H - Bogus `budsz` values cause `dbAdjTree()` to write attacker-influenced leaf values into wrong slots of the block allocation map, so the same disk blocks can be handed out to both file data and filesystem metadata \u2014 arbitrary corruption of on-disk state \u2014 and because the shift is undefined behaviour the computed index is not reliably contained.\nA:H - The shift-out-of-bounds is a UBSAN report that panics under `CONFIG_UBSAN_TRAP` or `panic_on_warn`, the `WARN_ON_ONCE` in `dbAdjTree()` is likewise fatal with `panic_on_warn`, and the corrupted allocation state drives `jfs_error()`/filesystem shutdown \u2014 all kernel-level denial of service."
    }
  }
}