{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49859", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.017Z", "datePublished": "2024-10-21T12:27:17.968Z", "dateUpdated": "2026-08-05T11:40:07.797Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:07.797Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to check atomic_file in f2fs ioctl interfaces\n\nSome f2fs ioctl interfaces like f2fs_ioc_set_pin_file(),\nf2fs_move_file_range(), and f2fs_defragment_range() missed to\ncheck atomic_write status, which may cause potential race issue,\nfix it." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached only through local ioctl() calls (`F2FS_IOC_START_ATOMIC_WRITE`, `F2FS_IOC_MOVE_RANGE`, `F2FS_IOC_SET_PIN_FILE`, `F2FS_IOC_DEFRAGMENT`) on file descriptors of an already-mounted f2fs filesystem. There is no remote or adjacent-network path into `fs/f2fs/file.c`.\nAC:L - For the two unprivileged entry points no race is required at all — the attacker simply issues `F2FS_IOC_START_ATOMIC_WRITE` and then `F2FS_IOC_MOVE_RANGE`/`F2FS_IOC_SET_PIN_FILE` in sequence on the same fd, deterministically reaching the unguarded state. Even the `f2fs_defragment_range()` TOCTOU is driven entirely by two attacker-owned threads.\nPR:L - `f2fs_ioc_set_pin_file()` and `__f2fs_ioc_move_range()` contain no `capable()` check whatsoever, and `f2fs_ioc_start_atomic_write()` only requires `inode_owner_or_capable()` on a file the attacker creates — so any unprivileged local user with a writable f2fs mount (every Android app on `/data`, any automounted f2fs volume) can trigger it. Only the `F2FS_IOC_DEFRAGMENT` variant needs `CAP_SYS_ADMIN`, and it is not the limiting path.\nUI:N - The attacker performs every step themselves against an already-mounted filesystem; no victim needs to open a file, mount a volume, or take any other action.\nS:U - The corruption is confined to f2fs metadata and kernel memory within the same security authority — a standard local kernel compromise with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Double-release of a physical block desynchronizes SIT/SSA and the valid-block bitmaps, so a block still mapped in the attacker's inode is marked free and reallocated to another user's or system file, letting the attacker read its contents through their own mapping. The `SET_PIN_FILE` variant likewise drives in-place writes against stale extent-cache block addresses.\nI:H - The same double-referenced block gives the attacker a write primitive into another file's data, and the corrupted block accounting plus `f2fs_replace_block()` on stale/`NULL_ADDR` mappings persistently corrupts on-disk filesystem metadata (`SBI_NEED_FSCK`).\nA:H - The inconsistent state reaches `f2fs_bug_on()` in `f2fs_invalidate_blocks()`, `dec_valid_block_count()`, and `update_sit_entry()`, which are plain `BUG_ON` under `CONFIG_F2FS_CHECK_FS` — an immediate kernel panic — and otherwise leave the filesystem corrupted and unusable." } ] } ], "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": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "26b07bd2e1f124b0e430c8d250023f7205c549c3", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "7cb51731f24b216b0b87942f519f2c67a17107ee", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "10569b682ebe9c75ef06ddd322ae844e9be6374b", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "d6f08c88047accc6127dddb6798a3ff11321539d", "status": "affected", "versionType": "git" }, { "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4", "lessThan": "bfe5c02654261bfb8bd9cb174a67f3279ea99e58", "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": "3.8", "status": "affected" }, { "version": "0", "lessThan": "3.8", "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": "3.8", "versionEndExcluding": "6.1.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.10.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.11.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/26b07bd2e1f124b0e430c8d250023f7205c549c3" }, { "url": "https://git.kernel.org/stable/c/7cb51731f24b216b0b87942f519f2c67a17107ee" }, { "url": "https://git.kernel.org/stable/c/10569b682ebe9c75ef06ddd322ae844e9be6374b" }, { "url": "https://git.kernel.org/stable/c/d6f08c88047accc6127dddb6798a3ff11321539d" }, { "url": "https://git.kernel.org/stable/c/bfe5c02654261bfb8bd9cb174a67f3279ea99e58" } ], "title": "f2fs: fix to check atomic_file in f2fs ioctl interfaces", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-49859", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-21T12:55:54.448840Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:10.668Z" } }, { "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": "2025-11-03T22:22:28.562Z" } } ] } }