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vuln-cve/data/2024/38xxx/CVE-2024-38623.json
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{
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"cveId": "CVE-2024-38623",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-06-18T19:36:34.945Z",
"datePublished": "2024-06-21T10:18:16.291Z",
"dateUpdated": "2026-08-05T11:33:14.587Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Use variable length array instead of fixed size\n\nShould fix smatch warning:\n\tntfs_set_label() error: __builtin_memcpy() 'uni->name' too small (20 vs 256)"
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"value": "AV:L - The affected code is the ntfs3 local filesystem name/label handling, reached through ordinary VFS syscalls (open/creat/link/rename/lookup) on a mounted volume or a write to /proc/fs/ntfs3/<dev>/label. No network protocol handling is involved.\nAC:L - Triggering is fully deterministic — the attacker simply supplies a name or label longer than 10 UTF-16 units, and the copy length is directly attacker-controlled. There is no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:L - While the ntfs_set_label() path is root-gated, the identical mis-sized cpu_str accesses in fill_name_de(), ntfs_lookup(), ntfs_d_hash() and ntfs_d_compare() are reached by any unprivileged user creating, renaming, linking or merely looking up a long file name on an already-mounted ntfs3 volume.\nUI:N - No victim action is required once an ntfs3 volume is mounted, which is the normal state on desktops, kiosks, Android and media devices with USB/NTFS storage; the attacker acts entirely on their own.\nS:U - The corruption stays within kernel memory under the same security authority; there is no VM, IOMMU or sandbox boundary crossed.\nC:H - Up to 256 bytes (label path) and 510 bytes (name path) are read out of a 20-byte-declared array, an out-of-bounds read far beyond a few bounded bytes that can disclose adjacent kernel heap contents into on-disk name/label attributes readable by the attacker.\nI:H - The same paths write up to 510 bytes through the 20-byte-declared name member with attacker-controlled length and content, an out-of-bounds write that is the classic primitive for adjacent-object corruption and control-flow hijack.\nA:H - Out-of-declared-bounds access of this size corrupts or over-reads adjacent kernel heap state and trips CONFIG_FORTIFY_SOURCE field-spanning detection, resulting in kernel warnings, oops or panic (fatal with panic_on_warn)."
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