248 lines
13 KiB
JSON
248 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-49859",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-10-21T12:17:06.017Z",
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"datePublished": "2024-10-21T12:27:17.968Z",
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"dateUpdated": "2026-08-05T11:40:07.797Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:40:07.797Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/file.c"
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],
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"versions": [
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "26b07bd2e1f124b0e430c8d250023f7205c549c3",
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"status": "affected",
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"versionType": "git"
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "7cb51731f24b216b0b87942f519f2c67a17107ee",
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"status": "affected",
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"lessThan": "10569b682ebe9c75ef06ddd322ae844e9be6374b",
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"status": "affected",
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"status": "affected",
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}
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/file.c"
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],
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"versions": [
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{
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"version": "3.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.113",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.54",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.2",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "6.1.113"
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"references": [
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"url": "https://git.kernel.org/stable/c/26b07bd2e1f124b0e430c8d250023f7205c549c3"
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"url": "https://git.kernel.org/stable/c/7cb51731f24b216b0b87942f519f2c67a17107ee"
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{
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"url": "https://git.kernel.org/stable/c/10569b682ebe9c75ef06ddd322ae844e9be6374b"
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"url": "https://git.kernel.org/stable/c/d6f08c88047accc6127dddb6798a3ff11321539d"
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"url": "https://git.kernel.org/stable/c/bfe5c02654261bfb8bd9cb174a67f3279ea99e58"
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}
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],
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"title": "f2fs: fix to check atomic_file in f2fs ioctl interfaces",
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-49859",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"Automatable": "no"
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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2024-10-21T12:55:54.448840Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2024-10-21T13:04:10.668Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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