{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50230", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.973Z", "datePublished": "2024-11-09T10:14:40.576Z", "dateUpdated": "2026-08-05T11:42:39.000Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:42:39.000Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix kernel bug due to missing clearing of checked flag\n\nSyzbot reported that in directory operations after nilfs2 detects\nfilesystem corruption and degrades to read-only,\n__block_write_begin_int(), which is called to prepare block writes, may\nfail the BUG_ON check for accesses exceeding the folio/page size,\ntriggering a kernel bug.\n\nThis was found to be because the \"checked\" flag of a page/folio was not\ncleared when it was discarded by nilfs2's own routine, which causes the\nsanity check of directory entries to be skipped when the directory\npage/folio is reloaded. So, fix that.\n\nThis was necessary when the use of nilfs2's own page discard routine was\napplied to more than just metadata files." } ], "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 code is reached only through a locally mounted nilfs2 block device — mount(2) plus ordinary directory syscalls (getdents, creat, unlink, rename) on that mount; no network protocol handler is involved. Attack Vector is Local rather than Physical because the attacker supplies image data (USB stick, disk image, container volume) and need not touch hardware.\nAC:L - The attacker fully controls the crafted nilfs2 image, so they choose the corruption that forces nilfs_error() into read-only degrade, and they can force the discard-then-reload sequence on demand with sync(2)/fsync(2) followed by a directory access. Nothing depends on conditions outside their influence, and the sequence can be retried indefinitely (syzbot reproduces it).\nPR:N - The attacker needs no account or privilege on the target system — they only supply the crafted nilfs2 medium, and the image can be built so that mount plus routine directory browsing by the victim (file manager readdir/lookup, thumbnailer) drives the corrupted path itself. This matches the established framing for crafted-filesystem-image flaws.\nUI:R - nilfs2 is FS_REQUIRES_DEV with no FS_USERNS_MOUNT, so the crafted image must be mounted by a privileged actor — a victim inserting the removable medium into a desktop/kiosk with udisks2 automount, an admin mounting a supplied image, or a loop mount inside a container.\nS:U - The out-of-bounds access and the BUG() occur inside the kernel's own memory and locking domain on the same system; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Bypassing nilfs_check_folio() lets nilfs_readdir() pass an unvalidated de->name_len (up to 255) to dir_emit() for an entry only 12 bytes from the folio end, leaking roughly 250 bytes of adjacent kernel heap directly into a userspace getdents() buffer. That is far more than a strictly bounded few-byte read, and it also exposes nilfs2 private metadata inodes through lookup.\nI:H - With the sanity gate skipped, nilfs_add_link() and nilfs_delete_entry() perform entry splitting and merging (de1->rec_len writes, memcpy into de->name, pde->rec_len rewrites) using offsets derived from unvalidated on-disk rec_len/name_len, corrupting directory data and filesystem metadata. The bypassed NILFS_PRIVATE_INODE check further permits directory entries to resolve to nilfs2's DAT/cpfile/sufile/ifile inodes, giving a type-confusion primitive against internal metadata.\nA:H - The reported and primary outcome is BUG_ON(to > folio_size(folio)) in __block_write_begin_int(), a kernel BUG taken while holding the folio lock and directory inode lock, which oopses the task and leaves the filesystem permanently wedged, or panics outright with panic_on_oops." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nilfs2/page.c" ], "versions": [ { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "994b2fa13a6c9cf3feca93090a9c337d48e3d60d", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "64afad73e4623308d8943645e5631f2c7a2d7971", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "aa0cee46c5d3fd9a39575a4c8a4f65f25f095b89", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "f05dbebb8ee34882505d53d83af7d18f28a49248", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "cd0cdb51b15203fa27d4b714be83b7dfffa0b752", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "f2f1fa446676c21edb777e6d2bc4fa8f956fab68", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "56c6171932a7fb267ac6cb4ff8759b93ee1d0e2e", "status": "affected", "versionType": "git" }, { "version": "8c26c4e2694a163d525976e804d81cd955bbb40c", "lessThan": "41e192ad2779cae0102879612dfe46726e4396aa", "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/nilfs2/page.c" ], "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.323", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.229", "lessThanOrEqual": "5.10.*", "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": "3.10", "versionEndExcluding": "4.19.323" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.10.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.171" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.116" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.60" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.11.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/994b2fa13a6c9cf3feca93090a9c337d48e3d60d" }, { "url": "https://git.kernel.org/stable/c/64afad73e4623308d8943645e5631f2c7a2d7971" }, { "url": "https://git.kernel.org/stable/c/aa0cee46c5d3fd9a39575a4c8a4f65f25f095b89" }, { "url": "https://git.kernel.org/stable/c/f05dbebb8ee34882505d53d83af7d18f28a49248" }, { "url": "https://git.kernel.org/stable/c/cd0cdb51b15203fa27d4b714be83b7dfffa0b752" }, { "url": "https://git.kernel.org/stable/c/f2f1fa446676c21edb777e6d2bc4fa8f956fab68" }, { "url": "https://git.kernel.org/stable/c/56c6171932a7fb267ac6cb4ff8759b93ee1d0e2e" }, { "url": "https://git.kernel.org/stable/c/41e192ad2779cae0102879612dfe46726e4396aa" } ], "title": "nilfs2: fix kernel bug due to missing clearing of checked flag", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50230", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:16:44.018414Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:17:27.750Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:27:11.058Z" } } ] } }