CVE-2026-23234 Details
Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid UAF in f2fs_write_end_io() As syzbot reported an use-after-free issue in f2fs_write_end_io(). It is caused by below race condition: loop device umount - worker_thread - loop_process_work - do_req_filebacked - lo_rw_aio - lo_rw_aio_complete - blk_mq_end_request - blk_update_request - f2fs_write_end_io - dec_page_count - folio_end_writeback - kill_f2fs_super - kill_block_super - f2fs_put_super : free(sbi) : get_pages(, F2FS_WB_CP_DATA) accessed sbi which is freed In kill_f2fs_super(), we will drop all page caches of f2fs inodes before call free(sbi), it guarantee that all folios should end its writeback, so it should be safe to access sbi before last folio_end_writeback(). Let's relocate ckpt thread wakeup flow before folio_end_writeback() to resolve this issue.
A use-after-free vulnerability has been identified in the F2FS (Flash-Friendly File System) implementation of the Linux kernel. This issue arises in the 'f2fs_write_end_io' function, where a race condition allows a freed structure to be accessed, potentially leading to memory corruption or other unintended behavior. The vulnerability is triggered during the unmounting process of a loop device, where the file system's superblock is freed while I/O operations are still being processed.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0fb58aff0dafd6837cc91f4154f3ed6e020358fa | kernel.org | Patch |
| https://git.kernel.org/stable/c/2f67ff1e15a8a4d0e4ffc6564ab20d03d7398fe9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/505e1c0530db6152cab3feef8e3e4da3d3e358c9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/995030be4ce6338c6ff814583c14166446a64008 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a42f99be8a16b32a0bb91bb6dda212a6ad61be5d | kernel.org | Patch |
| https://git.kernel.org/stable/c/acc2c97fc0005846e5cf11b5ba3189fef130c9b3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ce2739e482bce8d2c014d76c4531c877f382aa54 | kernel.org | Patch |
| https://git.kernel.org/stable/c/cf4a9e1bc8129eb63fda5f8bdcd8d87f0bd76f42 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.13, < 5.10.251 >= 5.11, < 5.15.201 >= 5.16, < 6.1.164 >= 6.2, < 6.6.127 >= 6.7, < 6.12.74 >= 6.13, < 6.18.13 >= 6.19, < 6.19.3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Mar 17, 2026 | Initial Analysis | [email protected] |
| Mar 4, 2026 | New CVE Received | kernel.org |