{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47723",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-47723"
  ],
  "published": "2024-10-21T12:16:24Z",
  "summary": "jfs: fix out-of-bounds in dbNextAG() and diAlloc()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix out-of-bounds in dbNextAG() and diAlloc()\n\nIn dbNextAG() , there is no check for the case where bmp->db_numag is\ngreater or same than MAXAG due to a polluted image, which causes an\nout-of-bounds. Therefore, a bounds check should be added in dbMount().\n\nAnd in dbNextAG(), a check for the case where agpref is greater than\nbmp->db_numag should be added, so an out-of-bounds exception should be\nprevented.\n\nAdditionally, a check for the case where agno is greater or same than\nMAXAG should be added in diAlloc() to prevent out-of-bounds.",
  "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-2024-47723"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d1017d2a0f3f16dc1db5120e7ddbe7c6680425b0"
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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 reached through ordinary local syscalls (mkdir/creat/symlink) on a mounted JFS filesystem, after the attacker supplies a crafted image via removable media or a disk image file. There is no network-facing path to JFS metadata parsing.\nAC:L - Every input is deterministic on-disk metadata the attacker fully controls (dn_numag, db_agl2size, iag->agstart), and the decisive overlap of im_agctl[128] with the im_ipimap inode pointer is fixed by struct layout, so no race, no heap grooming, and no memory-layout luck is required.\nPR:L - Only an unprivileged local session user is needed in the realistic case: udisks2/polkit auto-mounts jfs removable media read-write for the active desktop/kiosk user, and triggering the OOB then requires nothing more than creating a file on that mount.\nUI:N - The attacker performs both steps themselves \u2014 inserting/mounting the malicious image and issuing the file-creation syscall \u2014 so no separate victim needs to act.\nS:U - The corruption is confined to kernel heap objects owned by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - dbNextAG() reads db_agfree[]/db_active[] arbitrarily far past the kmalloc'd struct bmap and diAlloc() reads im_agctl[] out of bounds, leaking adjacent kernel heap contents into allocation decisions; the overwritten im_ipimap pointer additionally yields a controlled-dereference read primitive.\nI:H - imap->im_agctl[128].inofree/.extfree write attacker-chosen 32-bit values directly over the struct inode *im_ipimap pointer that is subsequently dereferenced, and mutex_lock() is performed on out-of-bounds memory \u2014 a controlled kernel-pointer overwrite suitable for control-flow hijacking.\nA:H - The unbounded agpref walk in dbNextAG() dereferences unmapped memory and the corrupted im_ipimap pointer is later dereferenced, both producing a kernel oops/panic."
    }
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}