CVE-2021-47007— f2fs: fix panic during f2fs_resize_fs()
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I. Basic Information for CVE-2021-47007
Vulnerability Information
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Vulnerability Title
f2fs: fix panic during f2fs_resize_fs()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix panic during f2fs_resize_fs() f2fs_resize_fs() hangs in below callstack with testcase: - mkfs 16GB image & mount image - dd 8GB fileA - dd 8GB fileB - sync - rm fileA - sync - resize filesystem to 8GB kernel BUG at segment.c:2484! Call Trace: allocate_segment_by_default+0x92/0xf0 [f2fs] f2fs_allocate_data_block+0x44b/0x7e0 [f2fs] do_write_page+0x5a/0x110 [f2fs] f2fs_outplace_write_data+0x55/0x100 [f2fs] f2fs_do_write_data_page+0x392/0x850 [f2fs] move_data_page+0x233/0x320 [f2fs] do_garbage_collect+0x14d9/0x1660 [f2fs] free_segment_range+0x1f7/0x310 [f2fs] f2fs_resize_fs+0x118/0x330 [f2fs] __f2fs_ioctl+0x487/0x3680 [f2fs] __x64_sys_ioctl+0x8e/0xd0 do_syscall_64+0x33/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The root cause is we forgot to check that whether we have enough space in resized filesystem to store all valid blocks in before-resizing filesystem, then allocator will run out-of-space during block migration in free_segment_range().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 f2fs_resize_fs() 期间的恐慌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-47007
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Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total
| CVE-2021-46995 | can: mcp251xfd: mcp251xfd_probe(): fix an error pointer dereference in probe | |
| CVE-2021-46998 | ethernet:enic: Fix a use after free bug in enic_hard_start_xmit | |
| CVE-2021-46999 | sctp: do asoc update earlier in sctp_sf_do_dupcook_a | |
| CVE-2021-47001 | xprtrdma: Fix cwnd update ordering | |
| CVE-2021-47004 | f2fs: fix to avoid touching checkpointed data in get_victim() | |
| CVE-2021-47003 | dmaengine: idxd: Fix potential null dereference on pointer status | |
| CVE-2021-47005 | PCI: endpoint: Fix NULL pointer dereference for ->get_features() | |
| CVE-2021-47006 | ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook | |
| CVE-2021-47009 | KEYS: trusted: Fix memory leak on object td | |
| CVE-2021-47002 | SUNRPC: Fix null pointer dereference in svc_rqst_free() | |
| CVE-2021-46997 | arm64: entry: always set GIC_PRIO_PSR_I_SET during entry | |
| CVE-2021-46996 | netfilter: nftables: Fix a memleak from userdata error path in new objects | |
| CVE-2021-46994 | can: mcp251x: fix resume from sleep before interface was brought up | |
| CVE-2021-46992 | netfilter: nftables: avoid overflows in nft_hash_buckets() | |
| CVE-2021-46993 | sched: Fix out-of-bound access in uclamp | |
| CVE-2021-46990 | powerpc/64s: Fix crashes when toggling entry flush barrier | |
| CVE-2021-46991 | i40e: Fix use-after-free in i40e_client_subtask() | |
| CVE-2021-46989 | hfsplus: prevent corruption in shrinking truncate | |
| CVE-2021-46987 | btrfs: fix deadlock when cloning inline extents and using qgroups | |
| CVE-2021-46988 | userfaultfd: release page in error path to avoid BUG_ON |
Showing top 20 of 86 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2021-47007
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