{"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"}}]}}