arm64: hibernate: mask DAIF before restoring hibernated kernel

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Summary

CVECVE-2026-93256
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:22 UTC
Updated2026-09-24 16:17:22 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 716c41bd476334afb943308be9ff2142e34461b7 git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 5370853041a3cb53a125b77528586278f64b378b git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 290c5b0c9fc0c61fb1c41421ed2394f955206ea0 git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 012823494e20c3cce622982ebd3fd6971be39ad2 git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e d736ace2c491623c9ab5e73744085e93e9ae3ebe git Not specified
CNA Linux Linux affected 82869ac57b5d3b550446932c918dbf2caf020c9e 684bde100117931f4c51c644a95f42f2dab041bc git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/716c41bd476334afb943308be9ff2142e34461b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/012823494e20c3cce622982ebd3fd6971be39ad2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d736ace2c491623c9ab5e73744085e93e9ae3ebe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/290c5b0c9fc0c61fb1c41421ed2394f955206ea0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5370853041a3cb53a125b77528586278f64b378b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/684bde100117931f4c51c644a95f42f2dab041bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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