CVE-2026-46194

Kernel crash via F2FS extent-tree race

Published May 28, 2026 · Updated May 28, 2026

Race condition in Linux Kernel F2FS affected releases allows local users to crash the kernel during concurrent inode teardown and writeback. f2fs_destroy_extent_node() clears an extent tree without first setting FI_NO_EXTENT, so writeback can add a node before __destroy_extent_node() verifies node_cnt. Triggering the failure requires an F2FS inode drop with I_SYNC while a kworker updates the same read or block-age extent tree; the reported consequence is a kernel BUG and service interruption.

CVSS severity4.7
Medium
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Race condition in Linux Kernel F2FS affected releases allows local users to crash the kernel during concurrent inode teardown and writeback. f2fs_destroy_extent_node() clears an extent tree without first setting FI_NO_EXTENT, so writeback can add a node before __destroy_extent_node() verifies node_cnt. Triggering the failure requires an F2FS inode drop with I_SYNC while a kworker updates the same read or block-age extent tree; the reported consequence is a kernel BUG and service interruption.

The record

CVE
CVE-2026-46194
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-367, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=295b50e95e900da31ff237e46e04525fa799b2cf <42dd1c91f993431d0b399502479d00e6ad1bca71
  2. Affected versionversion=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <0559a0e962aacbb47519e26ee663be04b72dcb92
  3. Affected versionversion=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <b0e4395870eb3441ddc959f6710b5f6ca61aff26
  4. Affected versionversion=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <ed78aeebef05212ef7dca93bd931e4eff67c113f
  5. Affected versionversion=6.12.5 <6.12.88
  6. Affected versionversion=6.13
  7. Affected versionversion=6.6.66 <6.6.140
  8. Affected versionversion=924f7dd1e832e4e4530d14711db223d2803f7b61 <ab1eaf9d5c99042f5b0243bf67a06283a4c0757f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=295b50e95e900da31ff237e46e04525fa799b2cf <42dd1c91f993431d0b399502479d00e6ad1bca71; version=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <0559a0e962aacbb47519e26ee663be04b72dcb92; version=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <b0e4395870eb3441ddc959f6710b5f6ca61aff26; version=3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343 <ed78aeebef05212ef7dca93bd931e4eff67c113f; version=6.12.5 <6.12.88; version=6.13; version=6.6.66 <6.6.140; version=924f7dd1e832e4e4530d14711db223d2803f7b61 <ab1eaf9d5c99042f5b0243bf67a06283a4c0757f

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499.004Application or System Exploitation

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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