---
id: CVE-2024-56611
title: 'mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM

  We currently assume that there is at least one VMA in a MM, which isn't
  true.

  So we mig…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 <
    482bafbbebcaf286579f93494ba6899030a6ad47
  - >-
    Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 <
    a13b2b9b0b0b04612c7d81e3b3dfb485c5f7abc3
  - >-
    Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 <
    42d9fe2adf8613f9eea1f0c2619c9e2611eae0ea
  - >-
    Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 <
    091c1dd2d4df6edd1beebe0e5863d4034ade9572
  - Linux 2.6.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-10-01T20:01:24.636376Z'
published: '2024-12-27'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:20:23.545Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-56611'
references:
  - url: 'https://git.kernel.org/stable/c/482bafbbebcaf286579f93494ba6899030a6ad47'
  - url: 'https://git.kernel.org/stable/c/a13b2b9b0b0b04612c7d81e3b3dfb485c5f7abc3'
  - url: 'https://git.kernel.org/stable/c/42d9fe2adf8613f9eea1f0c2619c9e2611eae0ea'
  - url: 'https://git.kernel.org/stable/c/091c1dd2d4df6edd1beebe0e5863d4034ade9572'
tags:
  - cve.org
epss: 0.00206
epssPercentile: 0.10701
ingestedAt: '2026-11-03T14:47:02.527Z'
---

## Overview

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

mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM

We currently assume that there is at least one VMA in a MM, which isn't
true.

So we might end up having find_vma() return NULL, to then de-reference
NULL.  So properly handle find_vma() returning NULL.

This fixes the report:

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline]
RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194
Code: ...
RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000
RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044
RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1
R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003
R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8
FS:  00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709
 __do_sys_migrate_pages mm/mempolicy.c:1727 [inline]
 __se_sys_migrate_pages mm/mempolicy.c:1723 [inline]
 __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

[akpm@linux-foundation.org: add unlikely()]

## Affected

- `Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 < 482bafbbebcaf286579f93494ba6899030a6ad47`
- `Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 < a13b2b9b0b0b04612c7d81e3b3dfb485c5f7abc3`
- `Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 < 42d9fe2adf8613f9eea1f0c2619c9e2611eae0ea`
- `Linux >= 39743889aaf76725152f16aa90ca3c45f6d52da3 < 091c1dd2d4df6edd1beebe0e5863d4034ade9572`
- `Linux 2.6.16`

## Remediation

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