{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-47740", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.959Z", "datePublished": "2024-10-21T12:14:09.171Z", "dateUpdated": "2026-08-05T11:39:50.713Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:50.713Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: Require FMODE_WRITE for atomic write ioctls\n\nThe F2FS ioctls for starting and committing atomic writes check for\ninode_owner_or_capable(), but this does not give LSMs like SELinux or\nLandlock an opportunity to deny the write access - if the caller's FSUID\nmatches the inode's UID, inode_owner_or_capable() immediately returns true.\n\nThere are scenarios where LSMs want to deny a process the ability to write\nparticular files, even files that the FSUID of the process owns; but this\ncan currently partially be bypassed using atomic write ioctls in two ways:\n\n - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can\n truncate an inode to size 0\n - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert\n changes another process concurrently made to a file\n\nFix it by requiring FMODE_WRITE for these operations, just like for\nF2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these\nioctls when intending to write into the file, that seems unlikely to break\nanything." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires issuing F2FS_IOC_START_ATOMIC_REPLACE/COMMIT/ABORT ioctls on a local file descriptor for a regular file on a locally-mounted f2fs filesystem. There is no network-reachable path to fs/f2fs/file.c ioctl handlers.\nAC:L - The destructive primitive is two deterministic ioctl calls on an fd the attacker already holds — no race, no memory-layout dependency, no timing sensitivity. Even the rollback variant is attacker-timed: it chooses when to START and when to ABORT, and any concurrent writes landing in that window are discarded, so a wider window simply catches more.\nPR:L - Only local unprivileged code execution plus an O_RDONLY fd on a file whose UID matches the attacker's FSUID is needed; inode_owner_or_capable() short-circuits on the UID match, so no capability, user namespace, or root is required. mnt_want_write_file() checks only that the mount is writable, not the fd.\nUI:N - START_ATOMIC_REPLACE + COMMIT_ATOMIC_WRITE truncates the file to zero entirely under attacker control, with no victim action required. The attacker opens the file itself and needs nothing from any other process.\nS:U - The vulnerable f2fs ioctl handler and the impacted files are both governed by the kernel's security authority; bypassing an in-kernel LSM check is not a crossing into a different authority. No hypervisor, IOMMU, or VM boundary is traversed.\nC:N - The bug is purely a missing write-side access-control check — the attacker already holds read access to the target file, so nothing new is disclosed. No kernel memory is leaked and no read primitive is created.\nI:H - The attacker gains write-equivalent power over files the security policy explicitly protected from modification: complete irreversible truncation to size 0, and silent rollback of another process's already-acknowledged writes. For a Landlock- or SELinux-confined process the protected file set is exactly what falls, and every byte of it can be destroyed — a total loss of integrity for the affected resources.\nA:H - Truncating a target such as a system database, keystore, or configuration file to zero permanently destroys the resource and renders the depending service unavailable. Independently, the attacker can pin the inode in atomic-write state for as long as it chooses, causing all O_DIRECT reads/writes from legitimate processes to fail -EOPNOTSUPP and fallocate/MOVE_RANGE/SET_PIN_FILE/defrag to fail -EINVAL — a sustained, attacker-controlled 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/f2fs/file.c" ], "versions": [ { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "4ce87674c3a6b4d3b3d45f85b584ab8618a3cece", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "000bab8753ae29a259feb339b99ee759795a48ac", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "88ff021e1fea2d9b40b2d5efd9013c89f7be04ac", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "32f348ecc149e9ca70a1c424ae8fa9b6919d2713", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "5e0de753bfe87768ebe6744d869caa92f35e5731", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "f3bfac2cabf5333506b263bc0c8497c95302f32d", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "4583290898c13c2c2e5eb8773886d153c2c5121d", "status": "affected", "versionType": "git" }, { "version": "88b88a66797159949cec32eaab12b4968f6fae2d", "lessThan": "4f5a100f87f32cb65d4bb1ad282a08c92f6f591e", "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/f2fs/file.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "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": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.2", "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": "3.18", "versionEndExcluding": "4.19.323" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.10.227" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.10.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.11.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653" }, { "url": "https://git.kernel.org/stable/c/4ce87674c3a6b4d3b3d45f85b584ab8618a3cece" }, { "url": "https://git.kernel.org/stable/c/000bab8753ae29a259feb339b99ee759795a48ac" }, { "url": "https://git.kernel.org/stable/c/88ff021e1fea2d9b40b2d5efd9013c89f7be04ac" }, { "url": "https://git.kernel.org/stable/c/32f348ecc149e9ca70a1c424ae8fa9b6919d2713" }, { "url": "https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731" }, { "url": "https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d" }, { "url": "https://git.kernel.org/stable/c/4583290898c13c2c2e5eb8773886d153c2c5121d" }, { "url": "https://git.kernel.org/stable/c/4f5a100f87f32cb65d4bb1ad282a08c92f6f591e" } ], "title": "f2fs: Require FMODE_WRITE for atomic write ioctls", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-47740", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-21T12:59:19.414286Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:14.597Z" } }, { "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": "2025-11-03T22:21:36.961Z" } } ] } }