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NVD / CVE Program· CNA Linux

CVE-2026-89566: jbd2: check need_resched() when skipping busy checkpoint buffers

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 5.16, 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4, 6.2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 5.16, 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4, 6.2 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: check need_resched() when skipping busy checkpoint buffers journal_shrink_one_cp_list() skips busy checkpoint buffers when called with JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also skips the need_resched() check at the end of the loop body. Consequently, when a checkpoint list contains mostly busy buffers, the shrinker can walk the entire list while holding journal->j_list_lock, even when a reschedule has been requested. Large checkpoint lists under memory pressure can therefore cause long lock hold times and leave other CPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls. Route the busy-buffer path through the need_resched() check so that the shrinker can release j_list_lock and reschedule promptly, restoring parity with the clean-buffer path, which already checks need_resched(). This does not change which checkpoint buffers are eligible for removal.

—No exploit Fix available
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%

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Noroxi analysis

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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 dc7ece0b827fe3b748db685fb85cd2fc3710c3f9affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before f83c23286e54180cdc83a36463a60003534cc290affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before f9182a85991a0ad5cd2940df6db75f40ad90028caffected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before 595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4affected · git
    • b98dba273a0e47dbfade89c9af73c5b012a4eabb and later · before f213e12ff5c9590b1034ae8da0e6d09665c772d0affected · 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-2026-89564Sep 11, 2026 · ip: orphan prefetched skbs before multicast forwarding
    31Monitor
  • ← EarlierCVE-2026-89565Sep 11, 2026 · ipip: fix skb leak in collect_md mode when metadata_dst allocation fails
    0Monitor
  • Later →CVE-2026-89567Sep 11, 2026 · jbd2: bound shrinker scans by examined checkpoint buffers
    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 Linux5.16Vendor (CNA)
Linux Linux595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4Vendor (CNA)
Linux Linux6.2Vendor (CNA)
Linux Linux6.5Vendor (CNA)
Linux Linuxdc7ece0b827fe3b748db685fb85cd2fc3710c3f9Vendor (CNA)
Linux Linuxf213e12ff5c9590b1034ae8da0e6d09665c772d0Vendor (CNA)
Linux Linuxf83c23286e54180cdc83a36463a60003534cc290Vendor (CNA)
Linux Linuxf9182a85991a0ad5cd2940df6db75f40ad90028cVendor (CNA)
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).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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.

Change log

  1. Fix✗ → ✓

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References

Show all references (4 more)

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

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