CVE-2025-68772

Kernel crash via F2FS compression-context race

Published Jan 13, 2026 · Updated Jan 13, 2026

Denial of service in Linux Kernel F2FS allows local users to crash the kernel through concurrent fsync, truncate, and file-attribute operations. During writeback, f2fs_setflags_common can install a compression context after f2fs_write_cache_pages cached a zero cluster size, causing f2fs_all_cluster_page_ready to divide the page index by zero. The race requires permission to manipulate the same F2FS inode; a successful trigger produces a kernel oops and service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel F2FS allows local users to crash the kernel through concurrent fsync, truncate, and file-attribute operations. During writeback, f2fs_setflags_common can install a compression context after f2fs_write_cache_pages cached a zero cluster size, causing f2fs_all_cluster_page_ready to divide the page index by zero. The race requires permission to manipulate the same F2FS inode; a successful trigger produces a kernel oops and service interruption.

The record

CVE
CVE-2025-68772
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <0bf1a02494c7eb5bd43445de4c83c8592e02c4bf
  2. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <0df713a9c082a474c8b0bcf670edc8e98461d5a0
  3. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <10b591e7fb7cdc8c1e53e9c000dc0ef7069aaa76
  4. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <ad26bfbc085c939b5dca77ff8c14798c06d151c4
  5. Affected versionversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <bcd0086ee5a2e88c1224ff2ec1e4a43c83efe5a0
  6. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <0bf1a02494c7eb5bd43445de4c83c8592e02c4bf; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <0df713a9c082a474c8b0bcf670edc8e98461d5a0; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <10b591e7fb7cdc8c1e53e9c000dc0ef7069aaa76; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <ad26bfbc085c939b5dca77ff8c14798c06d151c4; version=4c8ff7095bef64fc47e996a938f7d57f9e077da3 <bcd0086ee5a2e88c1224ff2ec1e4a43c83efe5a0; version=5.6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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