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NVD / CVE Program· CNA Linux

CVE-2026-89567: jbd2: bound shrinker scans by examined checkpoint buffers

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 15cb16496446b94e67f7abcb049b8e2c75cd3d02, 5.16, 6.2; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 15cb16496446b94e67f7abcb049b8e2c75cd3d02, 5.16, 6.2; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.

Published
Sep 11, 2026
Updated
Oct 21, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 9c31bb2684f8035beca0275349d19d679b679ffb, 5fda50e262e65bd553ff777c4b280afd1495a18b, 557fda9ed70ebf8eda2620ba3d746215285a1303, 6.5affected
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before 6b5366ba63a58819396045ab146bd37ff9e503c6affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before edf5fcd0469b7467bd5b37a79502c8d9c3257dbbaffected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before 71c6b872c746465fa4b5def239cb296173ca8216affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before c2c0fb364685b8996c357d3b050394959b29d6e0affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before 15cb16496446b94e67f7abcb049b8e2c75cd3d02affected · git
    • 5.15.129 and later · before 5.16affected · semver
    • 6.1.50 and later · before 6.2affected · semver
    • 6.4.13 and later · before 6.5affected · semver
    • before 6.5not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89565Sep 11, 2026 · ipip: fix skb leak in collect_md mode when metadata_dst allocation fails
    0Monitor
  • ← EarlierCVE-2026-89566Sep 11, 2026 · jbd2: check need_resched() when skipping busy checkpoint buffers
    0Monitor
  • Later →CVE-2026-89568Sep 11, 2026 · kho: fix size calculation in kho_preserved_memory_reserve()
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux15cb16496446b94e67f7abcb049b8e2c75cd3d02Vendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux6.2Vendor (CNA)
Linux Linux6.5Vendor (CNA)
Linux Linux6b5366ba63a58819396045ab146bd37ff9e503c6Vendor (CNA)
Linux Linux71c6b872c746465fa4b5def239cb296173ca8216Vendor (CNA)
Linux Linuxc2c0fb364685b8996c357d3b050394959b29d6e0Vendor (CNA)
Linux Linuxedf5fcd0469b7467bd5b37a79502c8d9c3257dbbVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records