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CVE-2021-47007 Details

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().

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f	kernel.org	Patch
https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6	kernel.org	Patch
https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2	kernel.org	Patch
https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705	kernel.org	Patch
https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f	CVE	Patch
https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6	CVE	Patch
https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2	CVE	Patch
https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705	CVE	Patch

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-754	Improper Check for Unusual or Exceptional Conditions	[email protected]

Affected Products

Product	Versions
linux linux kernel	>= 5.8, < 5.10.38 >= 5.11, < 5.11.22 >= 5.12, < 5.12.5
CPE cpe:2.3:o:linux:linux_kernel:::::::: Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	kernel.org
Jun 17, 2026	CVE Modified	CISA-ADP
Jan 8, 2025	Initial Analysis	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 28, 2024	CVE Modified	kernel.org
May 14, 2024	CVE Modified	kernel.org
Feb 28, 2024	New CVE Received	kernel.org