{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50247", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.978Z", "datePublished": "2024-11-09T10:14:56.165Z", "dateUpdated": "2026-08-05T11:42:44.376Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:42:44.376Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Check if more than chunk-size bytes are written\n\nA incorrectly formatted chunk may decompress into\nmore than LZNT_CHUNK_SIZE bytes and a index out of bounds\nwill occur in s_max_off." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "baseScore": 7.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The malformed LZNT chunk is delivered on a locally attached or loop-backed NTFS block device and is consumed through ordinary local file I/O (`read`/`mmap` → `ntfs_read_folio` → `ni_readpage_cmpr` → `ni_read_frame` → `decompress_lznt`); no network protocol or remote peer feeds `decompress_chunk()`.\nAC:L - The attacker authors every byte of the compressed chunk, and I confirmed by emulating the loop that an 8-byte chunk (header plus `02 41 FF 0F 42 43`) deterministically emits 4101 bytes and drives `index` past the end of `s_max_off[]`; there is no race, no memory-layout precondition, and the trigger repeats at will.\nPR:L - ntfs3 registers with `FS_REQUIRES_DEV` and no `FS_USERNS_MOUNT`, but udisks2 loop-setup and removable-media automount hand the mount to any active local session on desktop, kiosk, NAS and media-appliance deployments, and ntfs3 mounts default to permissive uid/gid/fmask/dmask. Once mounted, an unprivileged user reaches `decompress_lznt()` by simply reading a compressed file, with no capability check on the path.\nUI:N - The attacker supplies the crafted image, gets it mounted via automount/udisks2, and then performs the triggering `read()`/`mmap()` of the compressed file itself; no action by any other user or administrator is required.\nS:U - The out-of-bounds read, the corrupted decompression state, and any resulting fault all occur inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The scan reads kernel memory past the 9-entry global `s_max_off[]` with an attacker-chosen stop threshold (`up - unc`, selectable across [4097, 65535]), so the read is unbounded rather than limited to a few bytes. The resulting `index` feeds `parse_pair()` and therefore changes the `offset`/`length` of the bytes materialized into the frame the attacker reads back, turning the out-of-bounds contents into a binary-search oracle over post-array kernel memory — which in ntfs3's module `.rodata` includes relocated pointers, leaking the KASLR base.\nI:L - I traced every store: `offset` is rejected by `if (unc + offset > up) return -EINVAL;` and `length` is truncated by `if (up + length >= unc_end) length = unc_end - up;`, so even with the UB shifts in `parse_pair()` at `index > 12` no write escapes the frame buffer — there is no memory-corruption or control-flow primitive here. The bounded integrity effect is that the corrupted `index` makes the kernel materialize wrong bytes into the compressed file's page cache, which the RMW path at `fs/ntfs3/file.c:1039`/`:1104` recompresses and writes back, persisting bad content on a volume other users of that shared media then read.\nA:H - The index-correction loop has no upper bound and keeps advancing until it finds an out-of-bounds qword at least as large as the attacker-selected threshold, so on the common `CONFIG_NTFS3_FS=m` builds it can run past the module's read-only region into a vmalloc guard page and take a kernel page fault — an oops, and a full panic on the many embedded and hardened deployments running `panic_on_oops`. On KASAN builds the very first access at `index == 9` is an immediate global-out-of-bounds BUG, which is precisely the syzbot-reported crash class that motivated the later `a93980141253` hardening." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/lznt.c" ], "versions": [ { "version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "e5ae7859008688626b4d2fa6139eeaa08e255053", "status": "affected", "versionType": "git" }, { "version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "1b6bc5f7212181093b6c5310eea216fc09c721a9", "status": "affected", "versionType": "git" }, { "version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "5f21e3e60982cd7353998b4f59f052134fd47d64", "status": "affected", "versionType": "git" }, { "version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "4a4727bc582832f354e0d3d49838a401a28ae25e", "status": "affected", "versionType": "git" }, { "version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e", "lessThan": "9931122d04c6d431b2c11b5bb7b10f28584067f0", "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/lznt.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.171", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.116", "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": "5.15.171" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.116" }, { "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/e5ae7859008688626b4d2fa6139eeaa08e255053" }, { "url": "https://git.kernel.org/stable/c/1b6bc5f7212181093b6c5310eea216fc09c721a9" }, { "url": "https://git.kernel.org/stable/c/5f21e3e60982cd7353998b4f59f052134fd47d64" }, { "url": "https://git.kernel.org/stable/c/4a4727bc582832f354e0d3d49838a401a28ae25e" }, { "url": "https://git.kernel.org/stable/c/9931122d04c6d431b2c11b5bb7b10f28584067f0" } ], "title": "fs/ntfs3: Check if more than chunk-size bytes are written", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50247", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:15:58.403606Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:17:25.362Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:27:27.327Z" } } ] } }