{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-49859", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-49859" ], "published": "2024-10-21T12:27:33Z", "summary": "f2fs: fix to check atomic_file in f2fs ioctl interfaces", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", 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"https://www.cve.org/CVERecord?id=CVE-2024-49859" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/26b07bd2e1f124b0e430c8d250023f7205c549c3" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7cb51731f24b216b0b87942f519f2c67a17107ee" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/10569b682ebe9c75ef06ddd322ae844e9be6374b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/d6f08c88047accc6127dddb6798a3ff11321539d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/bfe5c02654261bfb8bd9cb174a67f3279ea99e58" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "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 \u2014 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 \u2014 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 \u2014 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` \u2014 an immediate kernel panic \u2014 and otherwise leave the filesystem corrupted and unusable." } } }