# CVE-2026-89753

## Summary

- **CVE ID:** CVE-2026-89753
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

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]

## Affected Products

- Linux — Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (8315f42295d2667a7f942f154b73a86fd7cb2227)
- Linux — Linux (3.18)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/b5391676c61d94ffe3272dcf6723738b802f79e8)
- [CNA](https://git.kernel.org/stable/c/3fd50239986302cb050d3649351bcec00fa9d5ab)
- [CNA](https://git.kernel.org/stable/c/cf3ba0911a1cf8680371ff113b90088edd01d2bb)
- [CNA](https://git.kernel.org/stable/c/25f52e81216884a7444bf07a606691feb09a94e3)
- [CNA](https://git.kernel.org/stable/c/4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57)
- [CNA](https://git.kernel.org/stable/c/4cdc1bdf40944de5c6b118fef07ad23f07844338)
- [CNA](https://git.kernel.org/stable/c/a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b)
- [CNA](https://git.kernel.org/stable/c/029c9408049f7f582230322057b7075bea594fd5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.4

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._