CVE-2026-89834

Service interruption via incomplete F2FS curseg evacuation

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds I/O in Linux 5.10 and affected later commits allows local users to interrupt F2FS-backed systems during filesystem shrink. The free_segment_range() loop stops at NR_CURSEG_PERSIST_TYPE, leaving active nonpersistent curseg types inside the storage range being truncated. Subsequent writes target blocks beyond the new device boundary; exploitation requires privileged filesystem-resize access and a live affected curseg in the removed range.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds I/O in Linux 5.10 and affected later commits allows local users to interrupt F2FS-backed systems during filesystem shrink. The free_segment_range() loop stops at NR_CURSEG_PERSIST_TYPE, leaving active nonpersistent curseg types inside the storage range being truncated. Subsequent writes target blocks beyond the new device boundary; exploitation requires privileged filesystem-resize access and a live affected curseg in the removed range.

The record

CVE
CVE-2026-89834
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.10
  2. Affected versionversion=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <3b85edf3391f3e1f624f409a7d2d239885f567b7
  3. Affected versionversion=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
  4. Affected versionversion=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b8ae1228c153622afa71a179c9d4dc268117e0f0
  5. Affected versionversion=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b9776094aa7118e8e5dfdcd791ffc8330c5ca408

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <3b85edf3391f3e1f624f409a7d2d239885f567b7; version=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1; version=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b8ae1228c153622afa71a179c9d4dc268117e0f0; version=d0b9e42ab6155dc05fc83f00af9f45d4dd02264d <b9776094aa7118e8e5dfdcd791ffc8330c5ca408

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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