Medium 5.5Published Apr 16, 2025

CVE-2025-22127f2fs: fix potential deadloop in prepare_compress_overwrite()

Updated under an hour ago (2026-10-22 02:40 UTC)

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In the Linux kernel, the following vulnerability has been resolved: f2fs: fix potential deadloop in prepare_compress_overwrite() Jan Prusakowski reported a kernel hang issue as below: When running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I encountered a problem in generic/475 test where fsstress process gets blocked in __f2fs_write_data_pages() and the test hangs. The options I used are: MKFS_OPTIONS -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc MOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc INFO: task kworker/u8:0:11 blocked for more than 122 seconds. Not tainted 6.14.0-rc3-xfstests-lockdep #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208160 flags:0x00004000 Workqueue: writeback wb_workfn (flush-253:0) Call Trace: <TASK> __schedule+0x309/0x8e0 schedule+0x3a/0x100 schedule_preempt_disabled+0x15/0x30 __mutex_lock+0x59a/0xdb0 __f2fs_write_data_pages+0x3ac/0x400 do_writepages+0xe8/0x290 __writeback_single_inode+0x5c/0x360 writeback_sb_inodes+0x22f/0x570 wb_writeback+0xb0/0x410 wb_do_writeback+0x47/0x2f0 wb_workfn+0x5a/0x1c0 process_one_work+0x223/0x5b0 worker_thread+0x1d5/0x3c0 kthread+0xfd/0x230 ret_from_fork+0x31/0x50 ret_from_fork_asm+0x1a/0x30 </TASK> The root cause is: once generic/475 starts toload error table to dm device, f2fs_prepare_compress_overwrite() will loop reading compressed cluster pages due to IO error, meanwhile it has held .writepages lock, it can block all other writeback tasks. Let's fix this issue w/ below changes: - add f2fs_handle_page_eio() in prepare_compress_overwrite() to detect IO error. - detect cp_error earler in f2fs_read_multi_pages().

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4c8ff7095bef64fc47e996a938f7d57f9e077da3 before 4513843d58d8fa1daebd3817205a15309b146342; from 4c8ff7095bef64fc47e996a938f7d57f9e077da3 before 7cd460bd9e7c6e6c30a33982603f65fb5deab1e4; from 4c8ff7095bef64fc47e996a938f7d57f9e077da3 before 7215cf8ef54bdc9082dffac4662416d54961e258; from 4c8ff7095bef64fc47e996a938f7d57f9e077da3 before 3147ee567dd9004a49826ddeaf0a4b12865d4409	CNA record
linux linux_kernel linux:linux_kernel	from 5.6 before 6.14.2	NVD

References

https://git.kernel.org/stable/c/4513843d58d8fa1daebd3817205a15309b146342
https://git.kernel.org/stable/c/7cd460bd9e7c6e6c30a33982603f65fb5deab1e4
https://git.kernel.org/stable/c/7215cf8ef54bdc9082dffac4662416d54961e258patch
https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.