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vuln-cve/data/2024/34xxx/CVE-2024-34027.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
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"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": "2026-10-15T00:40:44.472Z"
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"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."
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"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."
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