275 lines
15 KiB
JSON
275 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-26869",
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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": "2024-02-19T14:20:24.184Z",
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"datePublished": "2024-04-17T10:27:30.100Z",
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"dateUpdated": "2026-10-30T12:17:55.855Z"
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},
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"dateUpdated": "2026-10-30T12:17:55.855Z"
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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: fix to truncate meta inode pages forcely\n\nBelow race case can cause data corruption:\n\nThread A\t\t\t\tGC thread\n\t\t\t\t\t- gc_data_segment\n\t\t\t\t\t - ra_data_block\n\t\t\t\t\t - locked meta_inode page\n- f2fs_inplace_write_data\n - invalidate_mapping_pages\n : fail to invalidate meta_inode page\n due to lock failure or dirty|writeback\n status\n - f2fs_submit_page_bio\n : write last dirty data to old blkaddr\n\t\t\t\t\t - move_data_block\n\t\t\t\t\t - load old data from meta_inode page\n\t\t\t\t\t - f2fs_submit_page_write\n\t\t\t\t\t : write old data to new blkaddr\n\nBecause invalidate_mapping_pages() will skip invalidating page which\nhas unclear status including locked, dirty, writeback and so on, so\nwe need to use truncate_inode_pages_range() instead of\ninvalidate_mapping_pages() to make sure meta_inode page will be dropped."
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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:H/I:H/A:H",
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"baseScore": 7.8,
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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 vulnerable paths are entered through ordinary local file operations on a mounted f2fs volume — buffered overwrite with IPU, fdatasync, or O_DIRECT write — with the racing side driven by the in-kernel GC thread. No network or physical access is involved.\nAC:L - The attacker controls the write side outright and can drive the GC side at will by fragmenting/filling the filesystem to keep background and foreground GC continuously active; the invalidation failure window is the full duration of GC's read bio, during which ra_data_block() holds the meta page locked, so the skip is the expected outcome rather than a narrow accident, and the attempt can be repeated indefinitely.\nPR:L - Any unprivileged local user with write access to a file on an f2fs volume can reach both f2fs_inplace_write_data() and the F2FS_GET_BLOCK_DIO path; the CAP_SYS_ADMIN check on f2fs_ioc_gc() is not a barrier because the default background GC thread and f2fs_balance_fs()-triggered foreground GC provide the racing side without any privilege.\nUI:N - The attacker's own process performs the writes and the GC thread runs automatically as a kernel thread; no victim action of any kind is required.\nS:U - The corruption is confined to the f2fs filesystem and kernel managing it, with no crossing into a different security authority such as a hypervisor or IOMMU domain.\nC:H - META_MAPPING is a global cache keyed by physical block address, and f2fs_invalidate_blocks() can likewise fail to evict, so a stale page can outlive the block's reallocation to a different inode — move_data_block() then copies the previous owner's on-disk content into the attacker's file, disclosing another user's data (plaintext for verity/compressed inodes).\nI:H - This is a direct, silent, persistent on-disk data corruption primitive: freshly written data is overwritten with stale contents, and via physical-block reuse an attacker's stale data can be written into another inode's blocks, modifying data outside the attacker's control with no error reported.\nA:H - Corrupted blocks landing in compressed clusters or encrypted directory/dentry blocks produce decompression and directory-parse failures that raise EFSCORRUPTED, set SBI_NEED_FSCK, and trigger f2fs_handle_error() shutdown (panic under errors=panic or CONFIG_F2FS_CHECK_FS), alongside irrecoverable loss of the corrupted file data."
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}
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]
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}
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/checkpoint.c",
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"fs/f2fs/f2fs.h",
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"fs/f2fs/segment.c",
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"include/linux/f2fs_fs.h"
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"fs/f2fs/checkpoint.c",
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"fs/f2fs/segment.c",
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"include/linux/f2fs_fs.h"
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"versions": [
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"version": "0",
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"status": "unaffected",
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"version": "6.1.191",
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