222 lines
13 KiB
JSON
222 lines
13 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-2022-49363",
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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": "2025-02-26T02:08:31.547Z",
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"datePublished": "2025-02-26T02:11:09.817Z",
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"dateUpdated": "2026-08-15T12:22:39.847Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-15T12:22:39.847Z"
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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 do sanity check on block address in f2fs_do_zero_range()\n\nAs Yanming reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=215894\n\nI have encountered a bug in F2FS file system in kernel v5.17.\n\nI have uploaded the system call sequence as case.c, and a fuzzed image can\nbe found in google net disk\n\nThe kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can\nreproduce the bug by running the following commands:\n\nkernel BUG at fs/f2fs/segment.c:2291!\nCall Trace:\n f2fs_invalidate_blocks+0x193/0x2d0\n f2fs_fallocate+0x2593/0x4a70\n vfs_fallocate+0x2a5/0xac0\n ksys_fallocate+0x35/0x70\n __x64_sys_fallocate+0x8e/0xf0\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is, after image was fuzzed, block mapping info in inode\nwill be inconsistent with SIT table, so in f2fs_fallocate(), it will cause\npanic when updating SIT with invalid blkaddr.\n\nLet's fix the issue by adding sanity check on block address before updating\nSIT table with it."
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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 path is reached via local VFS fallocate(FALLOC_FL_ZERO_RANGE) on a mounted crafted f2fs image (f2fs_fallocate → f2fs_zero_range → f2fs_do_zero_range → f2fs_invalidate_blocks); f2fs is not a network protocol handler, and exploitation depends on supplying/mounting malicious on-disk metadata locally.\nAC:L - The attacker fully controls the on-disk inode/dnode block addresses in the fuzzed image, so fallocate with ZERO_RANGE|KEEP_SIZE (as in the bugzilla case.c) deterministically hits update_sit_entry with the bad blkaddr; no race or attacker-uncontrollable timing is required.\nPR:L - Once the crafted image is mounted (Android/udisks automount of SD/removable media, shared workstation), triggering requires only an unprivileged local user calling fallocate on a writable file; there is no capability check on the path from vfs_fallocate into f2fs_do_zero_range.\nUI:N - After the malicious image is present and mounted via automount or delegated mount rights, the attacker drives fallocate themselves with no further action by a separate victim user.\nS:U - Corruption and crash remain within the host kernel’s f2fs/SIT memory; this is standard local kernel impact, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - An attacker-chosen data_blkaddr that is outside MAIN_BLKADDR..MAX_BLKADDR is passed unchecked into get_seg_entry(), which indexes sit_i->sentries[segno] with no bounds check, yielding an out-of-bounds read of adjacent kernel heap before any BUG_ON.\nI:H - The same unchecked segno drives OOB writes through update_sit_entry (valid_blocks, cur_valid_map bit ops) and, with default !CONFIG_F2FS_CHECK_FS, f2fs_bug_on only WARNs then continues mutating SIT state—an attacker-controlled heap corruption / metadata-write primitive.\nA:H - The reported impact is a hard kernel BUG at update_sit_entry (f2fs_bug_on on negative/overflow valid_blocks or wrongly cleared SIT bitmap) under CONFIG_F2FS_CHECK_FS/KASAN as in the original reproducer, and OOB accesses can also oops on unmapped memory."
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}
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]
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}
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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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"fs/f2fs/file.c"
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"title": "f2fs: fix to do sanity check on block address in f2fs_do_zero_range()",
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