---
id: CVE-2026-93256
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: hibernate: mask DAIF before restoring hibernated kernel

  The arm64 hibernate code manages the exception masking in an unsound
  way, leading to potential crashes a…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: hibernate: mask DAIF before restoring hibernated kernel

  The arm64 hibernate code manages the exception masking in an unsound
  way, leading to potential crashes a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    716c41bd476334afb943308be9ff2142e34461b7
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    5370853041a3cb53a125b77528586278f64b378b
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    290c5b0c9fc0c61fb1c41421ed2394f955206ea0
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    012823494e20c3cce622982ebd3fd6971be39ad2
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    d736ace2c491623c9ab5e73744085e93e9ae3ebe
  - >-
    Linux >= 82869ac57b5d3b550446932c918dbf2caf020c9e <
    684bde100117931f4c51c644a95f42f2dab041bc
  - Linux 4.7
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:22.157'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93256'
references:
  - url: 'https://git.kernel.org/stable/c/012823494e20c3cce622982ebd3fd6971be39ad2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/290c5b0c9fc0c61fb1c41421ed2394f955206ea0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5370853041a3cb53a125b77528586278f64b378b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/684bde100117931f4c51c644a95f42f2dab041bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/716c41bd476334afb943308be9ff2142e34461b7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d736ace2c491623c9ab5e73744085e93e9ae3ebe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.833Z'
---

## Overview

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

arm64: hibernate: mask DAIF before restoring hibernated kernel

The arm64 hibernate code manages the exception masking in an unsound
way, leading to potential crashes and/or warnings during resume.

When a hibernation image is saved in `swsusp_arch_suspend()`, all DAIF
exceptions are masked (by virtue of `local_daif_save()`), and the
suspended image is saved assuming that all DAIF exceptions will remain
masked when the image is restored.

When a hibernation image is resumed by `swsusp_arch_resume()`, only
interrupts are masked (by virtue of `local_irq_disable()` in
`resume_target_kernel()`). When pseudo-NMI is enabled the DAIF.IF bits
will be clear, and regardless of pseudo-NMI the DAIF.DA bits will be
clear.

This means that there are two problems:

(1) It is possible to take Debug, SError, or pseudo-NMI exceptions
    during the resume process. This is unsafe, as during the resume
    process both the old ane new kernels will tranisently be in an
    inconsistent state, and swsusp_arch_suspend_exit() won't retain
    an executable mapping of any exception vectors.

    Any exception taken here will be fatal and silent.

(2) When re-entering the resumed kernel, some DAIF bits will be clear
    unexpectedly. This permits Debug, SError, or pseudo-NMI exceptions
    to be taken for a short period while the resumed kernel is not yet
    in a consistent state.

    This is detected by CONFIG_ARM64_DEBUG_PRIORITY_MASKING.

Avoid these issues by masking all DAIF exceptions during resume.

## Remediation

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