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CVE-2026-89753· NVD / CVE Program· CNA Linux

mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 029c9408049f7f582230322057b7075bea594fd5, 25f52e81216884a7444bf07a606691feb09a94e3, 3fd50239986302cb050d3649351bcec00fa9d5ab; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 029c9408049f7f582230322057b7075bea594fd5, 25f52e81216884a7444bf07a606691feb09a94e3, 3fd50239986302cb050d3649351bcec00fa9d5ab; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() I am seeing some rcu_tasks stalls in the Meta fleet during reclaim. INFO: rcu_tasks detected stalls on tasks: 0000000088620d09: .. nvcsw: 6735/6735 holdout: 1 idle_cpu: -1/8 task:GlobalCPUThread state:R running task pid:2552016 tgid:2524552 Call Trace: shrink_lruvec mem_cgroup_iter shrink_node do_try_to_free_pages try_to_free_pages __alloc_frozen_pages_noprof alloc_pages_noprof pte_alloc_one __pte_alloc handle_mm_fault Nothing promises direct reclaim returns in bounded time, and the scan loop in shrink_lruvec() only calls cond_resched(), which is a no-op on PREEMPTION kernels. Involuntary preemption is not a Tasks-RCU quiescent state, so the reclaiming task never reports one and becomes a holdout. Upgrade it to cond_resched_tasks_rcu_qs(), which reports a quiescent state even when cond_resched() does nothing. PS: This has been discussed in [1]

—No exploit Fix available
Published
Sep 11, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 6th 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 · 0.1%

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  • 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

    • 3.18affected
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57affected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before 4cdc1bdf40944de5c6b118fef07ad23f07844338affected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before a67a00a70a7c8309ca47ea157ef3e8ed3d268f5baffected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before 029c9408049f7f582230322057b7075bea594fd5affected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before b5391676c61d94ffe3272dcf6723738b802f79e8affected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before 3fd50239986302cb050d3649351bcec00fa9d5abaffected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before cf3ba0911a1cf8680371ff113b90088edd01d2bbaffected · git
    • 8315f42295d2667a7f942f154b73a86fd7cb2227 and later · before 25f52e81216884a7444bf07a606691feb09a94e3affected · git
    • before 3.18not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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.

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    40Plan
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  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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    40Plan
  • CVE-2026-72421ipv4: fib: Don't ignore error route in local/main tables.
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  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan

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 Linux029c9408049f7f582230322057b7075bea594fd5Vendor (CNA)
Linux Linux25f52e81216884a7444bf07a606691feb09a94e3Vendor (CNA)
Linux Linux3fd50239986302cb050d3649351bcec00fa9d5abVendor (CNA)
Linux Linux4cdc1bdf40944de5c6b118fef07ad23f07844338Vendor (CNA)
Linux Linux4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57Vendor (CNA)
Linux Linuxa67a00a70a7c8309ca47ea157ef3e8ed3d268f5bVendor (CNA)
Linux Linuxb5391676c61d94ffe3272dcf6723738b802f79e8Vendor (CNA)
Linux Linuxcf3ba0911a1cf8680371ff113b90088edd01d2bbVendor (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 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
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

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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 (7 more)

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

All records