Unknown

CVE-2026-89753 — mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()

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]

Published Sep 11, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.18%

ahead of 7% of scored CVEs · Oct 20, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < 4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < 4cdc1bdf40944de5c6b118fef07ad23f07844338≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < 029c9408049f7f582230322057b7075bea594fd5≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < b5391676c61d94ffe3272dcf6723738b802f79e8≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < 3fd50239986302cb050d3649351bcec00fa9d5ab≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < cf3ba0911a1cf8680371ff113b90088edd01d2bb≥ 8315f42295d2667a7f942f154b73a86fd7cb2227 and < 25f52e81216884a7444bf07a606691feb09a94e3 and 1 more version 3.18	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 20, 2026 · 5 reading(s) · max 0.18%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 11, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/cf3ba0911a1cf8680371ff113b90088edd01d2bb
NIST National Vulnerability Database
github.com/advisories/GHSA-vf4v-9g5v-367g
GitHub Security Advisories
git.kernel.org/stable/c/25f52e81216884a7444bf07a606691feb09a94e3
NIST National Vulnerability Database
git.kernel.org/stable/c/4cdc1bdf40944de5c6b118fef07ad23f07844338
NIST National Vulnerability Database
git.kernel.org/stable/c/4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57
NIST National Vulnerability Database
git.kernel.org/stable/c/029c9408049f7f582230322057b7075bea594fd5
NIST National Vulnerability Database
git.kernel.org/stable/c/a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b
NIST National Vulnerability Database
git.kernel.org/stable/c/b5391676c61d94ffe3272dcf6723738b802f79e8
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-89753
GitHub Security Advisories
git.kernel.org/stable/c/3fd50239986302cb050d3649351bcec00fa9d5ab
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis 1h
Unknown CVE-2023-7356 Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID 1h
Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 3d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 3d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 3d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89753 is "mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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