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CVE-2026-23232— Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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_enable_checkpoint函数存在死锁问题。

AI Predicted 4.4 Difficulty: Hard EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 196c81fdd438f7ac429d5639090a9816abb9760a< b6382273801bc7c778545dd8004c9a9d750b4f62 affected
196c81fdd438f7ac429d5639090a9816abb9760a< 3996b70209f145bfcf2afc7d05dd92c27b233b48 affected
6.19 affected
< 6.19 unaffected
6.19.3≤ 6.19.* unaffected
7.0≤ * unaffected
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I. Basic Information for CVE-2026-23232

Vulnerability Information
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Vulnerability Title
Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()" This reverts commit 196c81fdd438f7ac429d5639090a9816abb9760a. Original patch may cause below deadlock, revert it. write remount - write_begin - lock_page --- lock A - prepare_write_begin - f2fs_map_lock - f2fs_enable_checkpoint - down_write(cp_enable_rwsem) --- lock B - sync_inode_sb - writepages - lock_page --- lock A - down_read(cp_enable_rwsem) --- lock A
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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_enable_checkpoint函数存在死锁问题。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 196c81fdd438f7ac429d5639090a9816abb9760a ~ b6382273801bc7c778545dd8004c9a9d750b4f62 -
Linux Linux 6.19 -

II. Public POCs for CVE-2026-23232

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III. Intelligence Information for CVE-2026-23232

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Patches & Fixes for CVE-2026-23232 (2)

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

CVE-2026-23231 7.8 HIGH netfilter: nf_tables: fix use-after-free in nf_tables_addchain()
CVE-2026-23236 7.3 HIGH fbdev: smscufx: properly copy ioctl memory to kernelspace
CVE-2025-71238 scsi: qla2xxx: Fix bsg_done() causing double free
CVE-2026-23233 f2fs: fix to avoid mapping wrong physical block for swapfile
CVE-2026-23234 f2fs: fix to avoid UAF in f2fs_write_end_io()
CVE-2026-23235 f2fs: fix out-of-bounds access in sysfs attribute read/write
CVE-2026-23238 romfs: check sb_set_blocksize() return value
CVE-2026-23237 platform/x86: classmate-laptop: Add missing NULL pointer checks

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23232

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