{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-53147",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-53147"
  ],
  "published": "2024-12-24T11:29:52Z",
  "summary": "exfat: fix out-of-bounds access of directory entries",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix out-of-bounds access of directory entries\n\nIn the case of the directory size is greater than or equal to\nthe cluster size, if start_clu becomes an EOF cluster(an invalid\ncluster) due to file system corruption, then the directory entry\nwhere ei->hint_femp.eidx hint is outside the directory, resulting\nin an out-of-bounds access, which may cause further file system\ncorruption.\n\nThis commit adds a check for start_clu, if it is an invalid cluster,\nthe file or directory will be treated as empty.",
  "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-2024-53147"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a0120d6463368378539ef928cf067d02372efb8c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ddd1cb2b458ff6a193bc845f408dfff217db29e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/184fa506e392eb78364d9283c961217ff2c0617b"
    }
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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 - Triggering requires a crafted exFAT image to be mounted and then a lookup/create performed in the corrupt directory, which is a local operation \u2014 an unprivileged desktop user can loop-mount an arbitrary image via udisks2, or operate on an automounted USB/SD card. There is no network-reachable path into fs/exfat.\nAC:L - The attacker fully controls the on-disk bytes: setting a directory's stream-extension dentry to size >= cluster_size with an invalid start_clu is deterministic, and the follow-up lookup+create is a plain syscall sequence with no race, timing, or memory-layout dependency.\nPR:L - Only ordinary local user privileges are needed \u2014 udisks2/automount lets an unprivileged session user get the crafted exFAT image mounted, and any low-privileged user can then run lookup/creat/mkdir in the corrupt directory to drive the out-of-bounds access. Real root in the init namespace is not required.\nUI:N - In the self-mount scenario the attacker performs every step themselves \u2014 mount the image via the automount/loop path, then issue the lookup and create \u2014 with no action by any other user required.\nS:U - The corruption and disclosure stay within the kernel's own security authority and the filesystem it manages; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Because hint_femp.eidx and the inflated directory size index clusters outside the directory, readdir/lookup read clusters belonging to other files \u2014 or arbitrary sectors of the device with the unvalidated `cur_clu += clu_offset` path \u2014 and hand that content back to userspace as directory-entry names and attributes.\nI:H - Directory entries are written into clusters owned by other files, and exfat_chain_cont_cluster() rewrites FAT entries for clusters it does not own, splicing another file's clusters into the corrupt directory; this destroys unrelated user data and filesystem metadata, exactly the \"further file system corruption\" the commit cites.\nA:H - The bogus accesses funnel into exfat_fs_error(), which calls panic() under the supported errors=panic mount option and forces the filesystem read-only under the default, and the resulting inconsistent inode (i_size claiming N+1 clusters over a one-cluster chain) yields repeated I/O failures on every subsequent operation."
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}