GHSA-GJ5H-7FQ5-56P5
Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2026-09-07 18:31In 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: __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
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().
{
"affected": [],
"aliases": [
"CVE-2025-22127"
],
"database_specific": {
"cwe_ids": [
"CWE-667"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-16T15:16:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix potential deadloop in prepare_compress_overwrite()\n\nJan Prusakowski reported a kernel hang issue as below:\n\nWhen running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I\nencountered a problem in generic/475 test where fsstress process\ngets blocked in __f2fs_write_data_pages() and the test hangs.\nThe options I used are:\n\nMKFS_OPTIONS -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc\nMOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc\n\nINFO: task kworker/u8:0:11 blocked for more than 122 seconds.\n Not tainted 6.14.0-rc3-xfstests-lockdep #1\n\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:kworker/u8:0 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208160 flags:0x00004000\nWorkqueue: writeback wb_workfn (flush-253:0)\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x309/0x8e0\n schedule+0x3a/0x100\n schedule_preempt_disabled+0x15/0x30\n __mutex_lock+0x59a/0xdb0\n __f2fs_write_data_pages+0x3ac/0x400\n do_writepages+0xe8/0x290\n __writeback_single_inode+0x5c/0x360\n writeback_sb_inodes+0x22f/0x570\n wb_writeback+0xb0/0x410\n wb_do_writeback+0x47/0x2f0\n wb_workfn+0x5a/0x1c0\n process_one_work+0x223/0x5b0\n worker_thread+0x1d5/0x3c0\n kthread+0xfd/0x230\n ret_from_fork+0x31/0x50\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nThe root cause is: once generic/475 starts toload error table to dm\ndevice, f2fs_prepare_compress_overwrite() will loop reading compressed\ncluster pages due to IO error, meanwhile it has held .writepages lock,\nit can block all other writeback tasks.\n\nLet\u0027s fix this issue w/ below changes:\n- add f2fs_handle_page_eio() in prepare_compress_overwrite() to\ndetect IO error.\n- detect cp_error earler in f2fs_read_multi_pages().",
"id": "GHSA-gj5h-7fq5-56p5",
"modified": "2026-09-07T18:31:30Z",
"published": "2025-04-16T15:34:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22127"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3147ee567dd9004a49826ddeaf0a4b12865d4409"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7215cf8ef54bdc9082dffac4662416d54961e258"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7cd460bd9e7c6e6c30a33982603f65fb5deab1e4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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