---
id: CVE-2024-44965
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/mm: Fix pti_clone_pgtable() alignment assumption

  Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
  that had the form of endless traps until entry …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/mm: Fix pti_clone_pgtable() alignment assumption

  Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
  that had the form of endless traps until entry …
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'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.19, < 4.19.320'
  - 'linux_kernel >= 4.20, < 5.4.282'
  - 'linux_kernel >= 5.5, < 5.10.224'
  - 'linux_kernel >= 5.11, < 5.15.165'
  - 'linux_kernel >= 5.16, < 6.1.105'
  - 'linux_kernel >= 6.2, < 6.6.46'
  - 'linux_kernel >= 6.7, < 6.10.5'
  - linux_kernel = 6.11
patched:
  - linux_kernel 6.10.5
published: '2024-09-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:18:50.483'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-44965'
references:
  - url: 'https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00222
epssPercentile: 0.1188
ingestedAt: '2026-10-15T03:30:12.739Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T17:39:33.847439Z'
---

## Overview

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

x86/mm: Fix pti_clone_pgtable() alignment assumption

Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
that had the form of endless traps until entry stack exhaust and then
#DF from the stack guard.

It turned out that pti_clone_pgtable() had alignment assumptions on
the start address, notably it hard assumes start is PMD aligned. This
is true on x86_64, but very much not true on i386.

These assumptions can cause the end condition to malfunction, leading
to a 'short' clone. Guess what happens when the user mapping has a
short copy of the entry text?

Use the correct increment form for addr to avoid alignment
assumptions.

## Affected

- `linux_kernel >= 4.19, < 4.19.320`
- `linux_kernel >= 4.20, < 5.4.282`
- `linux_kernel >= 5.5, < 5.10.224`
- `linux_kernel >= 5.11, < 5.15.165`
- `linux_kernel >= 5.16, < 6.1.105`
- `linux_kernel >= 6.2, < 6.6.46`
- `linux_kernel >= 6.7, < 6.10.5`
- `linux_kernel = 6.11`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.10.5`