{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63817",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63817"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "f2fs: validate compress cache inode only when enabled",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: validate compress cache inode only when enabled\n\nF2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode\nnumber for the compressed page cache inode. That inode only exists when\nthe compress_cache mount option is enabled.\n\nWhen compress_cache is disabled, max_nid is outside the valid inode\nrange. A corrupted directory entry that points to ino == max_nid should\ntherefore be rejected by f2fs_check_nid_range(). However, is_meta_ino()\ncurrently treats F2FS_COMPRESS_INO() as a meta inode unconditionally,\nso f2fs_iget() bypasses do_read_inode() and its nid range check, and\ninstantiates a fake internal inode instead.\n\nGate the compressed cache inode case on COMPRESS_CACHE, matching\nf2fs_init_compress_inode(). With compress_cache disabled, ino ==\nmax_nid now follows the normal inode path and is rejected as an\nout-of-range nid.",
  "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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  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached through local VFS operations (open/lookup, get_parent, mount-time recovery, and background GC) on a mounted F2FS filesystem; there is no direct network packet handler, though NFS export is a secondary path still requiring local filesystem access to plant corruption.\nAC:L - An attacker can deterministically craft an F2FS image with a directory entry pointing at ino=max_nid (known at image creation) and reliably trigger f2fs_iget() on mount or lookup without depending on uncontrollable runtime conditions.\nPR:L - Triggering requires mounting or writing to F2FS, which needs CAP_SYS_ADMIN but is obtainable by an unprivileged user via user namespaces; planting a corrupted dentry also requires only low-privilege write access to the filesystem.\nUI:N - Once a crafted or corrupted filesystem is in place, exploitation is driven entirely by attacker-initiated syscalls (mount, lookup, open) or automatic kernel paths (GC, recovery) with no victim interaction required.\nS:U - Impact is confined to kernel memory/filesystem integrity on the host running the affected F2FS code; it does not cross a VM, container, or IOMMU security boundary in the manner of a guest-to-host escape.\nC:H - Bypassing inode validation instantiates a mis-typed, uninitialized inode that subsequent f2fs data and node paths operate on, creating a type-confusion condition that can be leveraged for arbitrary kernel memory read primitives.\nI:H - The fake compress-cache inode is wired with compress address_space operations and skips normal inode teardown, enabling type confusion that can be abused for arbitrary kernel memory writes or control-flow hijacking.\nA:H - Operating on an invalid synthetic inode in GC, recovery, or lookup paths can trigger kernel oops, EFSCORRUPTED error handling, or filesystem panic (errors=panic), causing denial of service or system crash."
    }
  }
}