{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-34027", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-24T13:54:11.051Z", "datePublished": "2024-06-24T13:56:49.389Z", "dateUpdated": "2026-08-05T11:29:52.924Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:52.924Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock\n\nIt needs to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock\nto avoid racing with checkpoint, otherwise, filesystem metadata including\nblkaddr in dnode, inode fields and .total_valid_block_count may be\ncorrupted after SPO case." } ], "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 only through the `F2FS_IOC_RELEASE_COMPRESS_BLOCKS` / `F2FS_IOC_RESERVE_COMPRESS_BLOCKS` ioctls issued on a local file descriptor of a mounted f2fs volume. There is no remote or network-facing path into `f2fs_{release,reserve}_compress_blocks()`.\nAC:L - The attacker drives both sides of the race — one thread loops the compress-block ioctls while another loops unprivileged `syncfs()`, which calls `f2fs_sync_fs(sb, 1)` → `f2fs_issue_checkpoint()`, so the racing checkpoint is attacker-scheduled rather than incidental. Once won, the inconsistent metadata is written to persistent storage and stays there, and f2fs compression is broadly deployed (Android GKI enables `CONFIG_F2FS_FS_COMPRESSION`), so no condition outside the attacker's influence is needed to reach the corrupt state.\nPR:L - Both ioctls carry no `capable()` or `CAP_SYS_ADMIN` check — unlike the adjacent `F2FS_IOC_RESIZE_FS`/`GARBAGE_COLLECT` handlers — and setting `FS_COMPR_FL` requires only `inode_owner_or_capable`. Any unprivileged local user with a file on a rw-mounted compression-enabled f2fs volume can create a compressed file and invoke them.\nUI:N - The attacker operates entirely on a file it creates and owns on an already-mounted filesystem, in a self-contained two-thread loop. No action by any other user or administrator is required.\nS:U - The corruption is confined to the f2fs filesystem metadata managed by the same kernel security authority that hosts the vulnerable code. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The persisted mismatch between inode compress accounting (`i_blocks`, `i_compr_blocks`, `FI_COMPRESS_RELEASED`) and the dnode blkaddr layout means a compressed cluster can be decompressed using a block count that no longer matches its real extent, surfacing content of blocks outside the file — a cross-file disclosure on a shared volume, which is why the fs is flagged `SBI_NEED_FSCK` rather than merely losing space.\nI:H - An unprivileged user achieves persistent, unauthorized corruption of shared on-disk filesystem metadata — dnode block addresses, inode `i_blocks`/`i_compr_blocks`, and the volume-global `total_valid_block_count` — affecting the entire filesystem and not just the attacker's own file, repairable only by fsck.\nA:H - After the unclean mount, `f2fs_sanity_check_ckpt()` rejects the volume with \"Wrong valid_user_blocks\" (`-EFSCORRUPTED`), rendering an f2fs root or `/data` unmountable and the device unbootable; `dec_valid_block_count()`'s `f2fs_bug_on(sbi, sbi->total_valid_block_count < count)` also yields a `BUG_ON` kernel panic under `CONFIG_F2FS_CHECK_FS`, with `SBI_NEED_FSCK`/forced read-only otherwise." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/file.c" ], "versions": [ { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "a6e1f7744e9b84f86a629a76024bba8468aa153b", "status": "affected", "versionType": "git" }, { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "b5bac43875aa27ec032dbbb86173baae6dce6182", "status": "affected", "versionType": "git" }, { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "5d47d63883735718825ca2efc4fca6915469774f", "status": "affected", "versionType": "git" }, { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "329edb7c9e3b6ca27e6ca67ab1cdda1740fb3a2b", "status": "affected", "versionType": "git" }, { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "69136304fd144144a4828c7b7b149d0f80321ba4", "status": "affected", "versionType": "git" }, { "version": "ef8d563f184e1112651f2cbde383d43e599334e8", "lessThan": "0a4ed2d97cb6d044196cc3e726b6699222b41019", "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/file.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.219", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.161", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.4", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "5.8", "versionEndExcluding": "5.10.219" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.161" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.9.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a6e1f7744e9b84f86a629a76024bba8468aa153b" }, { "url": "https://git.kernel.org/stable/c/b5bac43875aa27ec032dbbb86173baae6dce6182" }, { "url": "https://git.kernel.org/stable/c/5d47d63883735718825ca2efc4fca6915469774f" }, { "url": "https://git.kernel.org/stable/c/329edb7c9e3b6ca27e6ca67ab1cdda1740fb3a2b" }, { "url": "https://git.kernel.org/stable/c/69136304fd144144a4828c7b7b149d0f80321ba4" }, { "url": "https://git.kernel.org/stable/c/0a4ed2d97cb6d044196cc3e726b6699222b41019" } ], "title": "f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem 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