CVE-2025-22127

/// Technical description

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+

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References