CVE-2026-68459

System hang via uncommitted cached writeback bios

Published Aug 15, 2026 · Updated Aug 15, 2026

Deadlock in the Linux kernel F2FS component allows local users to hang the system through concurrent writeback and truncation. The f2fs_balance_fs() GC_MERGE path waits for foreground garbage collection without first submitting cached data and in-place-update bios, while the garbage collector and truncator contend for the same folio and its writeback completion. The path is reachable only on an F2FS filesystem mounted with gc_merge, and the resulting circular wait blocks filesystem work and can cause a system-wide service interrupt.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel F2FS component allows local users to hang the system through concurrent writeback and truncation. The f2fs_balance_fs() GC_MERGE path waits for foreground garbage collection without first submitting cached data and in-place-update bios, while the garbage collector and truncator contend for the same folio and its writeback completion. The path is reachable only on an F2FS filesystem mounted with gc_merge, and the resulting circular wait blocks filesystem work and can cause a system-wide service interrupt.

The record

CVE
CVE-2026-68459
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=351df4b201157351c7d26bf12c3eeb9dbce98854 <1436031b33fa23ab1ce7df5bc5500093413e8acf
  2. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <8071500a8124e5a6d47d901a8d5ffd91743107a1
  3. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <89479a27fa4e1e11f378b3724944eabceb84f114
  4. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <8b4468ec023d0d1b4669dfb867588997cc03a06b
  5. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <aa807064473abd6f2cafe419fb77ea402d3e3104
  6. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <b885c7783c19c36c7bf899492a0bffcd68afa8c7
  7. Affected versionversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <eb02f218aacb36365e0ca2339cbae81fb05d31a5
  8. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=351df4b201157351c7d26bf12c3eeb9dbce98854 <1436031b33fa23ab1ce7df5bc5500093413e8acf; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <8071500a8124e5a6d47d901a8d5ffd91743107a1; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <89479a27fa4e1e11f378b3724944eabceb84f114; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <8b4468ec023d0d1b4669dfb867588997cc03a06b; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <aa807064473abd6f2cafe419fb77ea402d3e3104; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <b885c7783c19c36c7bf899492a0bffcd68afa8c7; version=351df4b201157351c7d26bf12c3eeb9dbce98854 <eb02f218aacb36365e0ca2339cbae81fb05d31a5; version=3.8

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-833Deadlock
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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