CVE-2024-50246

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Attack Vector is therefore Local rather than Physical, since the attacker supplies the image data and does not need to touch the hardware themselves.\nAC:L - The attacker fully controls the on-disk `alloc_size` field in the crafted image, so the oversized-allocation path is triggered deterministically at mount time with no race, timing, or memory-layout dependency (syzbot has a reproducer). No conditions lie outside the attacker's control.\nPR:N - The attacker needs no account or privileges on the target system \u2014 they only need to hand over a malicious NTFS image or removable device, which is then mounted by an administrator or automatically by a desktop automounter such as udisks2. All parsing happens before any attacker credential is involved.\nUI:R - Some action on the victim's side is required to bring the crafted volume into the kernel \u2014 mounting the image, inserting the removable device, or opening a file on such a volume. The bug cannot fire without that step.\nS:U - The corruption and resource exhaustion are confined to the kernel of the machine performing the mount; no VM, IOMMU, or other security-authority boundary is crossed. This is a standard in-kernel filesystem parsing flaw.\nC:H - The unvalidated 64-bit `alloc_size` is truncated into 32-bit `CLST` bounds used as range guards in `attr_data_get_block()`, `attr_collapse_range()` and `attr_punch_hole()`, and inflates `sbi->mft.bitmap.nbits`, so attacker-chosen values defeat the bounds checks that keep cluster/MFT indexing in range and can expose kernel memory and out-of-range on-disk metadata.\nI:H - The same 64-bit-to-32-bit truncation and inflated MFT bitmap bounds let an attacker steer writes and MFT-extension arithmetic (`(u64)new_mft_total << record_bits`) outside the ranges the driver believes are valid, giving out-of-bounds indexing and filesystem-metadata corruption on a mounted read-write volume.\nA:H - The reported crash is a `WARN_ON_ONCE` splat from `kvmalloc_array()` in `wnd_init()` for an over-INT_MAX allocation, which is an immediate kernel panic on systems configured with `panic_on_warn`; tuned values instead force multi-hundred-megabyte to gigabyte kernel allocations and abort the mount, a reliable denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs3/record.c"], "versions": [{"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "effac690913af9a6c3d6cd967281a34e47ed3e4c", "status": "affected", "versionType": "git"}, {"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "e91fbb21f248bdd8140f343dac32b77b9bc10fec", "status": "affected", "versionType": "git"}, {"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "2fcae4c2014a40c8ae0fc3d8cca3ba9e168308de", "status": "affected", "versionType": "git"}, {"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "c4a8ba334262e9a5c158d618a4820e1b9c12495c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", 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{"bugzilla": {"description": "kernel: fs/ntfs3: Add rough attr alloc_size check", "id": "2324887", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2324887"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfs/ntfs3: Add rough attr alloc_size check"], "name": "CVE-2024-50246", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50246\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50246\nhttps://lore.kernel.org/linux-cve-announce/2024110935-CVE-2024-50246-5c55@gregkh/T"], "threat_severity": "Important"}

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