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🛡️ CVE-2024-56611 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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

[[email protected]: add unlikely()]

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-56611 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.12.5)
  • linux-kernel

Timeline and source

Published on 27 December 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-12-27
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.12.5
linux-kernel — —

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