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Linux Kernel CVE-2026-23234

HIGH
Use After Free (CWE-416)
2026-03-04 416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:05 vuln.today
CVE Published
Mar 04, 2026 - 15:16 nvd
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

A use-after-free vulnerability in the Linux kernel's f2fs filesystem allows a local attacker with user privileges to trigger memory corruption and crash the system through a race condition between I/O completion and filesystem unmount operations. The vulnerability occurs when a loop device completes write operations concurrently with an unmount that frees filesystem structures still being accessed by pending I/O handlers. This issue has no available patch and requires kernel-level access to exploit.

Technical ContextAI

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_supe

RemediationAI

Monitor vendor advisories for a patch.

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CVE-2022-2588 MEDIUM POC
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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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CVE-2026-23234 vulnerability details – vuln.today

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