222 lines
12 KiB
JSON
222 lines
12 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-2026-89840",
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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": "2026-09-11T19:38:34.769Z",
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"datePublished": "2026-09-16T10:31:14.646Z",
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"dateUpdated": "2026-10-30T12:33:17.413Z"
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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": "2026-10-30T12:33:17.413Z"
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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: validate MOVE_RANGE destination size\n\nF2FS_IOC_MOVE_RANGE checks the source range, but not the destination end\nbefore updating i_size. A source hole can expose this: __clone_blkaddrs()\nskips NULL_ADDR entries and returns success, so the caller can still extend\nthe destination inode with unchecked pos_out + len.\n\nReject destination overflow and use inode_newsize_ok() before extending\nthe destination inode."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 - F2FS_IOC_MOVE_RANGE is a local ioctl (f2fs_ioctl → f2fs_ioc_move_range → f2fs_move_file_range) on f2fs file descriptors. f2fs has no remap_file_range, so nfsd/ksmbd copy_file_range cannot reach this path.\nAC:L - The attacker fully controls pos_out and len and can ftruncate a sparse source so __clone_blkaddrs skips NULL_ADDR holes and returns success, making the unchecked destination i_size update deterministic with no race or uncontrollable layout.\nPR:L - f2fs_ioc_move_range has no capable() check; it only needs FMODE_READ|FMODE_WRITE on the source and FMODE_WRITE on the destination. Any unprivileged user with files on mounted f2fs (Android /data, embedded userdata) can trigger it.\nUI:N - The attacker opens their own files on an already-mounted f2fs volume and issues F2FS_IOC_MOVE_RANGE; no separate victim action such as mounting a filesystem or opening a crafted file is required.\nS:U - Impact is corruption of f2fs inode size metadata and subsequent filesystem/kernel state on the local host, a standard kernel compromise within the same security authority with no VM escape or IOMMU bypass.\nC:N - The bug writes an oversized or overflowed i_size; reads of the resulting sparse file return zeros or EOF (negative i_size makes pos >= i_size), and lookups beyond max_file_blocks fail with -E2BIG, so there is no kernel-memory or cross-file disclosure primitive.\nI:H - Missing overflow and inode_newsize_ok() checks let the attacker set destination i_size past s_maxbytes or wrap size_t into a negative loff_t, persisting corrupt on-disk inode size and poisoning later paths (fallocate COLLAPSE nrpages, __exchange_data_block ALLOC_NODE) that trust i_size for block-tree updates.\nA:H - A poisoned i_size enables unbounded node-tree walks and block-exchange loops (SEEK_DATA/HOLE, fallocate COLLAPSE via DIV_ROUND_UP(i_size)), can hang the kernel or exhaust node space, and leaves durable filesystem corruption on shared f2fs userdata."
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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": "4dd6f977fc778e5a0da604e5f8cb2f36d163d27b",
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"lessThan": "454de20a5a36c000b75f49337aae8c92045c5242",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4dd6f977fc778e5a0da604e5f8cb2f36d163d27b",
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"lessThan": "54c587f3f95ce2d6932a16566db83f73cc4313e1",
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"status": "affected",
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"lessThan": "bca61ee5192ea47003722486ae9588a2a4bb47b6",
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"status": "affected",
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"versionType": "git"
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{
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"version": "4dd6f977fc778e5a0da604e5f8cb2f36d163d27b",
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"lessThan": "db13064669526494cd78ba3a4394063b740e940c",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "dcae1eeda53149f219dd6af93b3083b7271c1c63",
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"status": "affected",
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"status": "affected",
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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": "4.8",
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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": "4.8",
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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": "6.1.191",
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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": "6.6.160",
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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": "6.12.112",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "4.8",
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"versionEndExcluding": "6.1.191"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/454de20a5a36c000b75f49337aae8c92045c5242"
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},
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{
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"url": "https://git.kernel.org/stable/c/54c587f3f95ce2d6932a16566db83f73cc4313e1"
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{
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"url": "https://git.kernel.org/stable/c/bca61ee5192ea47003722486ae9588a2a4bb47b6"
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"url": "https://git.kernel.org/stable/c/db13064669526494cd78ba3a4394063b740e940c"
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"url": "https://git.kernel.org/stable/c/dcae1eeda53149f219dd6af93b3083b7271c1c63"
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{
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"url": "https://git.kernel.org/stable/c/e533889fc26aea0cd83c90327063f272061dd820"
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}
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],
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"title": "f2fs: validate MOVE_RANGE destination size",
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