{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27034", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.211Z", "datePublished": "2024-05-01T12:53:39.767Z", "dateUpdated": "2026-08-05T11:29:08.856Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:08.856Z" }, "descriptions": [ { "lang": "en", "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." } ], "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 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/compress.c", "fs/f2fs/data.c" ], "versions": [ { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "7d420eaaa18ec8e2bb4eeab8c65c00492ef6f416", "status": "affected", "versionType": "git" }, { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "542c8b3c774a480bfd0804291a12f6f2391b0cd1", "status": "affected", "versionType": "git" }, { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "75abfd61392b1db391bde6d738a30d685b843286", "status": "affected", "versionType": "git" }, { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "2b1b14d9fc94b8feae20808684c8af28ec80f45b", "status": "affected", "versionType": "git" }, { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "52982edfcefd475cc34af663d5c47c0cddaa5739", "status": "affected", "versionType": "git" }, { "version": "4c8ff7095bef64fc47e996a938f7d57f9e077da3", "lessThan": "fd244524c2cf07b5f4c3fe8abd6a99225c76544b", "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/compress.c", "fs/f2fs/data.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.153", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.6", "versionEndExcluding": "5.15.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.7.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7d420eaaa18ec8e2bb4eeab8c65c00492ef6f416" }, { "url": "https://git.kernel.org/stable/c/542c8b3c774a480bfd0804291a12f6f2391b0cd1" }, { "url": "https://git.kernel.org/stable/c/75abfd61392b1db391bde6d738a30d685b843286" }, { "url": "https://git.kernel.org/stable/c/2b1b14d9fc94b8feae20808684c8af28ec80f45b" }, { "url": "https://git.kernel.org/stable/c/52982edfcefd475cc34af663d5c47c0cddaa5739" }, { "url": "https://git.kernel.org/stable/c/fd244524c2cf07b5f4c3fe8abd6a99225c76544b" } ], "title": "f2fs: compress: fix to cover normal cluster write with cp_rwsem", "x_generator": { "engine": "bippy-1.2.0" } }, 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