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        "cveId": "CVE-2022-48665",
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        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-02-25T13:44:28.320Z",
        "datePublished": "2024-04-28T13:01:46.203Z",
        "dateUpdated": "2026-08-05T08:51:40.854Z"
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                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix overflow for large capacity partition\n\nUsing int type for sector index, there will be overflow in a large\ncapacity partition.\n\nFor example, if storage with sector size of 512 bytes and partition\ncapacity is larger than 2TB, there will be overflow."
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                            "value": "AV:L - The bug is in exfat_zeroed_cluster(), reached only via local mkdir/directory-expansion paths (exfat_mkdir → exfat_alloc_new_dir / exfat_find_empty_entry) on a mounted exFAT volume, not via network packet processing.\nAC:L - An attacker who can write to a >2TB exFAT volume can fill lower clusters then create a directory so allocation returns a high cluster whose sector index truncates when assigned to int, reliably triggering the overflow.\nPR:L - Triggering requires only unprivileged write access to an already-mounted exFAT filesystem (common for automounted removable media); no root or init-namespace capabilities are needed for the vulnerable allocation path.\nUI:N - Once the volume is mounted writable, the attacker triggers the flaw solely by their own mkdir/directory-growth operations with no further victim interaction.\nS:U - Impact stays within the host kernel/filesystem authority; this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:N - The overflow causes wrong-sector zeroing via legitimate buffer_heads or skips zeroing; it does not provide a kernel memory read primitive or other information disclosure beyond normal filesystem access.\nI:H - Truncating sector_t blknr into int makes the loop zero the wrong sectors (e.g. from 0 through INT_MAX, ~1TiB), overwriting boot/FAT/bitmap and other volume data and destroying filesystem integrity.\nA:H - The same truncated loop can issue on the order of 2^31 block zeroing operations and then hit signed overflow UB, causing prolonged hang, severe I/O DoS, or kernel instability."
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