---
id: CVE-2026-89986
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  mm/mempolicy: fix sleeping allocation in
  alloc_pages_bulk_weighted_interleave()


  syzbot reported a sleeping function called from invalid context splat in

  bucket_table_a…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  mm/mempolicy: fix sleeping allocation in
  alloc_pages_bulk_weighted_interleave()


  syzbot reported a sleeping function called from invalid context splat in

  bucket_table_a…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 <
    bcb3d0c867ee40dc48e9c085bf328fbc679b6656
  - >-
    Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 <
    0ceda28f371df9e0bbdaa29214f71fe8298f23d8
  - >-
    Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 <
    2943f1f4b7f2816177060eb9f551f2e6d8b629ba
  - >-
    Linux >= fa3bea4e1f8202d787709b7e3654eb0a99aed758 <
    540e583b66d6402bf556fde5e53c817a54c1afe5
  - Linux 6.9
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:22.557'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89986'
references:
  - url: 'https://git.kernel.org/stable/c/0ceda28f371df9e0bbdaa29214f71fe8298f23d8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2943f1f4b7f2816177060eb9f551f2e6d8b629ba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/540e583b66d6402bf556fde5e53c817a54c1afe5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bcb3d0c867ee40dc48e9c085bf328fbc679b6656'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.951Z'
epss: 0.00163
epssPercentile: 0.0595
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

mm/mempolicy: fix sleeping allocation in alloc_pages_bulk_weighted_interleave()

syzbot reported a sleeping function called from invalid context splat in
bucket_table_alloc().

When rhashtable_insert_slow() rehashes the table under rcu_read_lock(), it
calls bucket_table_alloc(..., GFP_ATOMIC | __GFP_NOWARN).  If the bucket
table allocation uses vmalloc, __vmalloc_node_range_noprof() invokes
vm_area_alloc_pages() -> alloc_pages_bulk_mempolicy_noprof() with the
passed GFP_ATOMIC flags.

If the current task has an MPOL_WEIGHTED_INTERLEAVE mempolicy,
alloc_pages_bulk_weighted_interleave() is called and currently hardcodes
GFP_KERNEL when allocating the temporary weights array, triggering a
might_alloc() splat in atomic/RCU contexts.

Pass the gfp flags (masked with GFP_RECLAIM_MASK to strip page-allocator
zone modifiers like __GFP_HIGHMEM) received by
alloc_pages_bulk_weighted_interleave() to kmalloc() instead of hardcoding
GFP_KERNEL.  Since the weights buffer is immediately initialized in full,
kmalloc() is sufficient.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.