CVE-2026-89567

Soft lockups via unbounded checkpoint-list scans

Published Sep 11, 2026 · Updated Sep 11, 2026

Denial of service in Linux kernel jbd2 allows attackers to trigger soft lockups during checkpoint-list shrinking in affected releases. journal_shrink_one_cp_list charges nr_to_scan only for checkpoint buffers it releases, so busy buffers permit a full-list scan while journal->j_list_lock stays held. The path requires a large checkpoint transaction dominated by busy buffers; contending CPUs can spin until a soft lockup or RCU stall interrupts service.

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 jbd2 allows attackers to trigger soft lockups during checkpoint-list shrinking in affected releases. journal_shrink_one_cp_list charges nr_to_scan only for checkpoint buffers it releases, so busy buffers permit a full-list scan while journal->j_list_lock stays held. The path requires a large checkpoint transaction dominated by busy buffers; contending CPUs can spin until a soft lockup or RCU stall interrupts service.

The record

CVE
CVE-2026-89567
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=5.15.129 <5.16
  2. Affected versionversion=557fda9ed70ebf8eda2620ba3d746215285a1303
  3. Affected versionversion=5fda50e262e65bd553ff777c4b280afd1495a18b
  4. Affected versionversion=6.1.50 <6.2
  5. Affected versionversion=6.4.13 <6.5
  6. Affected versionversion=6.5
  7. Affected versionversion=9c31bb2684f8035beca0275349d19d679b679ffb
  8. Affected versionversion=b98dba273a0e47dbfade89c9af73c5b012a4eabb <15cb16496446b94e67f7abcb049b8e2c75cd3d02
  9. Affected versionversion=b98dba273a0e47dbfade89c9af73c5b012a4eabb <71c6b872c746465fa4b5def239cb296173ca8216
  10. Affected versionversion=b98dba273a0e47dbfade89c9af73c5b012a4eabb <c2c0fb364685b8996c357d3b050394959b29d6e0
  11. Affected versionversion=b98dba273a0e47dbfade89c9af73c5b012a4eabb <edf5fcd0469b7467bd5b37a79502c8d9c3257dbb

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.129 <5.16; version=557fda9ed70ebf8eda2620ba3d746215285a1303; version=5fda50e262e65bd553ff777c4b280afd1495a18b; version=6.1.50 <6.2; version=6.4.13 <6.5; version=6.5; version=9c31bb2684f8035beca0275349d19d679b679ffb; version=b98dba273a0e47dbfade89c9af73c5b012a4eabb <15cb16496446b94e67f7abcb049b8e2c75cd3d02; version=b98dba273a0e47dbfade89c9af73c5b012a4eabb <71c6b872c746465fa4b5def239cb296173ca8216; version=b98dba273a0e47dbfade89c9af73c5b012a4eabb <c2c0fb364685b8996c357d3b050394959b29d6e0; version=b98dba273a0e47dbfade89c9af73c5b012a4eabb <edf5fcd0469b7467bd5b37a79502c8d9c3257dbb

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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