CVE-2024-27034

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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 \u2014 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 \u2014 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": 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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 \u2014 creating the compressed file, overwriting the cluster, and forcing checkpoints. 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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. 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{"bugzilla": {"description": "kernel: f2fs: compress: fix to cover normal cluster write with cp_rwsem", "id": "2278465", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2278465"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: compress: fix to cover normal cluster write with cp_rwsem\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."], "name": "CVE-2024-27034", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-27034\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-27034\nhttps://lore.kernel.org/linux-cve-announce/2024050111-CVE-2024-27034-5872@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T11:21:51.381624+00:00", "updated": "2025-07-13T11:21:51.381680+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}