---
id: CVE-2026-43129
title: 'ima: verify the previous kernel''s IMA buffer lies in addressable RAM'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ima: verify the previous kernel's IMA buffer lies in addressable RAM

  Patch series "Address page fault in ima_restore_measurement_list()", v3.

  When the second-stage ke…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    43308106a1762b72f3b20a44b75b2df5cb25b77b
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    f11d7d088f5ed54b31c6735854c12845eb60eb4a
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    5366ec7d2f793ce703c403d7fd4c25a3db365b9d
  - >-
    Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 <
    10d1c75ed4382a8e79874379caa2ead8952734f9
  - Linux 6.0
published: '2026-05-06'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:25:03.802Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43129'
references:
  - url: 'https://git.kernel.org/stable/c/5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a'
  - url: 'https://git.kernel.org/stable/c/43308106a1762b72f3b20a44b75b2df5cb25b77b'
  - url: 'https://git.kernel.org/stable/c/f11d7d088f5ed54b31c6735854c12845eb60eb4a'
  - url: 'https://git.kernel.org/stable/c/9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa'
  - url: 'https://git.kernel.org/stable/c/5366ec7d2f793ce703c403d7fd4c25a3db365b9d'
  - url: 'https://git.kernel.org/stable/c/10d1c75ed4382a8e79874379caa2ead8952734f9'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02049
ingestedAt: '2026-11-05T15:02:32.275Z'
---

## Overview

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

ima: verify the previous kernel's IMA buffer lies in addressable RAM

Patch series "Address page fault in ima_restore_measurement_list()", v3.

When the second-stage kernel is booted via kexec with a limiting command
line such as "mem=<size>" we observe a pafe fault that happens.

    BUG: unable to handle page fault for address: ffff97793ff47000
    RIP: ima_restore_measurement_list+0xdc/0x45a
    #PF: error_code(0x0000)  not-present page

This happens on x86_64 only, as this is already fixed in aarch64 in
commit: cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer
against memory bounds")


This patch (of 3):

When the second-stage kernel is booted with a limiting command line (e.g. 
"mem=<size>"), the IMA measurement buffer handed over from the previous
kernel may fall outside the addressable RAM of the new kernel.  Accessing
such a buffer can fault during early restore.

Introduce a small generic helper, ima_validate_range(), which verifies
that a physical [start, end] range for the previous-kernel IMA buffer lies
within addressable memory:
	- On x86, use pfn_range_is_mapped().
	- On OF based architectures, use page_is_ram().

## Affected

- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a`
- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 43308106a1762b72f3b20a44b75b2df5cb25b77b`
- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < f11d7d088f5ed54b31c6735854c12845eb60eb4a`
- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa`
- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5366ec7d2f793ce703c403d7fd4c25a3db365b9d`
- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 10d1c75ed4382a8e79874379caa2ead8952734f9`
- `Linux 6.0`

## Remediation

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