318 lines
16 KiB
JSON
318 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2024-33847",
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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": "2024-06-24T13:54:11.027Z",
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"datePublished": "2024-06-24T13:56:48.723Z",
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"dateUpdated": "2026-10-15T00:40:43.234Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:29:51.830Z"
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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: don't allow unaligned truncation on released compress inode\n\nf2fs image may be corrupted after below testcase:\n- mkfs.f2fs -O extra_attr,compression -f /dev/vdb\n- mount /dev/vdb /mnt/f2fs\n- touch /mnt/f2fs/file\n- f2fs_io setflags compression /mnt/f2fs/file\n- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4\n- f2fs_io release_cblocks /mnt/f2fs/file\n- truncate -s 8192 /mnt/f2fs/file\n- umount /mnt/f2fs\n- fsck.f2fs /dev/vdb\n\n[ASSERT] (fsck_chk_inode_blk:1256) --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks\n[FSCK] valid_block_count matching with CP [Fail] [0x4, 0x5]\n[FSCK] other corrupted bugs [Fail]\n\nThe reason is: partial truncation assume compressed inode has reserved\nblocks, after partial truncation, valid block count may change w/o\n.i_blocks and .total_valid_block_count update, result in corruption.\n\nThis patch only allow cluster size aligned truncation on released\ncompress inode for fixing."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 entire attack sequence is local syscalls/ioctls on a mounted f2fs volume — `FS_IOC_SETFLAGS`, `write()`, `F2FS_IOC_RELEASE_COMPRESS_BLOCKS`, then `truncate()`. There is no network or remote-peer component.\nAC:L - The commit message contains a straight-line shell reproducer with no race, timing window, or memory-layout dependency; the attacker deterministically drives every step. f2fs compression is a standard, widely deployed configuration (Android /data, embedded flash devices).\nPR:L - `f2fs_release_compress_blocks()` carries no capability check at all — only `mnt_want_write_file()` and an exclusive `i_writecount` test — and setting the compression flag and truncating require only ownership/write permission on the attacker's own file. An ordinary unprivileged user (or an Android app on its own data files) can perform the full sequence.\nUI:N - The attacker creates, flags, writes, releases, and truncates their own file on an already-mounted filesystem; no victim needs to mount anything, open anything, or act in any way.\nS:U - The corruption is confined to the kernel/filesystem security authority that already manages the affected volume; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is block-accounting metadata desync (`i_blocks` / `total_valid_block_count` vs. the dnode); the newly allocated block is freshly written with the file's own decompressed data and no stale, out-of-bounds, or cross-file content is ever exposed to the attacker.\nI:H - It causes persistent, on-disk corruption of shared filesystem metadata — the inode's `i_blocks`, `i_compr_blocks` and the checkpoint's global `valid_block_count` — which survives reboot, is confirmed by fsck failure, and is not confined to the attacker's own file since the superblock/checkpoint accounting governs the whole volume.\nA:H - The skewed accounting reaches `f2fs_bug_on()` in `dec_valid_block_count()` and, once the over-reported free space is exhausted, `get_new_segment()`'s `f2fs_stop_checkpoint(STOP_CP_REASON_NO_SEGMENT)` + `f2fs_bug_on(sbi, 1)` — a kernel BUG/panic under `CONFIG_F2FS_CHECK_FS`, otherwise a shut-down checkpoint that makes the filesystem return `-EIO` for everything and require offline fsck."
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