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CVE-2026-23234— f2fs: fix to avoid UAF in f2fs_write_end_io()

EPSS 0.02% · P5
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I. Basic Information for CVE-2026-23234

Vulnerability Information
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Vulnerability Title
f2fs: fix to avoid UAF in f2fs_write_end_io()
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于f2fs_write_end_io函数存在释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux e234088758fca3a669ebb1a02d8bf7bf60f0e4ff ~ 0fb58aff0dafd6837cc91f4154f3ed6e020358fa -
LinuxLinux 3.13 -

II. Public POCs for CVE-2026-23234

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III. Intelligence Information for CVE-2026-23234

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Same Patch Batch · Linux · 2026-03-04 · 9 CVEs total

CVE-2026-232317.8 HIGHnetfilter: nf_tables: fix use-after-free in nf_tables_addchain()
CVE-2026-232367.3 HIGHfbdev: smscufx: properly copy ioctl memory to kernelspace
CVE-2026-23238romfs: check sb_set_blocksize() return value
CVE-2026-23237platform/x86: classmate-laptop: Add missing NULL pointer checks
CVE-2026-23235f2fs: fix out-of-bounds access in sysfs attribute read/write
CVE-2026-23233f2fs: fix to avoid mapping wrong physical block for swapfile
CVE-2026-23232Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"
CVE-2025-71238scsi: qla2xxx: Fix bsg_done() causing double free

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23234

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