{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50246", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.978Z", "datePublished": "2024-11-09T10:14:55.218Z", "dateUpdated": "2026-08-05T11:42:43.308Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:42:43.308Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Add rough attr alloc_size check" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable parser only processes MFT records read from a mounted NTFS block device, reached via mount(2) and subsequent local filesystem operations, with no network-facing path. 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 — 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 — 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", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/record.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.131", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.60", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.7", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.60" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.11.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/effac690913af9a6c3d6cd967281a34e47ed3e4c" }, { "url": "https://git.kernel.org/stable/c/e91fbb21f248bdd8140f343dac32b77b9bc10fec" }, { "url": "https://git.kernel.org/stable/c/2fcae4c2014a40c8ae0fc3d8cca3ba9e168308de" }, { "url": "https://git.kernel.org/stable/c/c4a8ba334262e9a5c158d618a4820e1b9c12495c" } ], "title": "fs/ntfs3: Add rough attr alloc_size check", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:31:42.870Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:38:19.266Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }