304 lines
16 KiB
JSON
304 lines
16 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-2024-27034",
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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": "2024-02-19T14:20:24.211Z",
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"datePublished": "2024-05-01T12:53:39.767Z",
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"dateUpdated": "2026-08-05T11:29:08.856Z"
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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": "2026-08-05T11:29:08.856Z"
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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: compress: fix to cover normal cluster write with cp_rwsem\n\nWhen we overwrite compressed cluster w/ normal cluster, we should\nnot unlock cp_rwsem during f2fs_write_raw_pages(), otherwise data\nwill be corrupted if partial blocks were persisted before CP & SPOR,\ndue to cluster metadata wasn't updated atomically."
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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 through ordinary local file I/O on an f2fs filesystem — write(2)/mmap dirty pages on a compression-enabled file plus writeback, with syncfs(2) driving the concurrent checkpoint. No network protocol handler is involved.\nAC:L - The attacker controls both sides of the race: one thread overwrites a compressed cluster with incompressible data to enter f2fs_write_raw_pages(), while another thread repeatedly calls the unprivileged syncfs(2), which takes cp_rwsem for write in the window the writer drops it between pages. No condition outside attacker influence is needed to create the inconsistent on-disk cluster state.\nPR:L - Only an unprivileged local account with write access to a file on the f2fs mount is required; f2fs_setflags_common() permits any file owner to set F2FS_COMPR_FL via FS_IOC_SETFLAGS, and compress_extension= mount options enable it automatically. No capability check exists on the write, writeback, or syncfs paths.\nUI:N - The attacker performs every step itself — creating the compressed file, overwriting the cluster, and forcing checkpoints. On Android and embedded devices the f2fs volume is already mounted at boot, so no victim action is needed.\nS:U - The corruption is confined to the f2fs filesystem and kernel managing it; no security authority boundary such as a VM, hypervisor, or IOMMU domain is crossed.\nC:H - Non-atomic cluster conversion corrupts dnode block addresses together with i_compr_blocks and total_valid_block_count, so blocks can become cross-linked — an attacker-controlled file ends up referencing blocks the allocator has reassigned to another user's file, exposing their contents on read. Half-converted clusters also cause stale compressed blocks to be decompressed into the attacker's page cache.\nI:H - This is fundamentally an integrity bug: the commit states data will be corrupted because cluster metadata is not updated atomically, and the resulting inconsistent dnode blkaddrs, i_blocks, and total_valid_block_count are persistent on-disk filesystem corruption that requires fsck. Cross-linked blocks additionally let the attacker overwrite data belonging to other files.\nA:H - The corrupted cluster makes f2fs_sanity_check_cluster()/__f2fs_cluster_blocks() return -EFSCORRUPTED and set SBI_NEED_FSCK, and f2fs_handle_error() can force the filesystem read-only or panic the kernel under errors=panic. On an embedded, automotive, or Android device whose rootfs/userdata is f2fs, the corrupted volume renders the system unbootable until repaired."
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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/compress.c",
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"fs/f2fs/data.c"
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],
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"versions": [
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"version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3",
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"lessThan": "7d420eaaa18ec8e2bb4eeab8c65c00492ef6f416",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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"lessThan": "52982edfcefd475cc34af663d5c47c0cddaa5739",
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"programFiles": [
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"fs/f2fs/compress.c",
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"fs/f2fs/data.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "5.15.153",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.83",
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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": "6.6.23",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.7.11",
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"lessThanOrEqual": "6.7.*",
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"status": "unaffected",
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},
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{
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"version": "6.8.2",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"title": "f2fs: compress: fix to cover normal cluster write with cp_rwsem",
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