Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-93256

arm64: hibernate: mask DAIF before restoring hibernated kernel

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

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 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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux 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 Linux

    4.7

  • KernelLinux

    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

References 8

git.kernel.org