{"id":"CVE-2026-93256","published":"2026-09-24T16:17:22.157","lastModified":"2026-09-24T16:17:22.157","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: hibernate: mask DAIF before restoring hibernated kernel\n\nThe arm64 hibernate code manages the exception masking in an unsound\nway, leading to potential crashes and/or warnings during resume.\n\nWhen a hibernation image is saved in `swsusp_arch_suspend()`, all DAIF\nexceptions are masked (by virtue of `local_daif_save()`), and the\nsuspended image is saved assuming that all DAIF exceptions will remain\nmasked when the image is restored.\n\nWhen a hibernation image is resumed by `swsusp_arch_resume()`, only\ninterrupts are masked (by virtue of `local_irq_disable()` in\n`resume_target_kernel()`). When pseudo-NMI is enabled the DAIF.IF bits\nwill be clear, and regardless of pseudo-NMI the DAIF.DA bits will be\nclear.\n\nThis means that there are two problems:\n\n(1) It is possible to take Debug, SError, or pseudo-NMI exceptions\n    during the resume process. This is unsafe, as during the resume\n    process both the old ane new kernels will tranisently be in an\n    inconsistent state, and swsusp_arch_suspend_exit() won't retain\n    an executable mapping of any exception vectors.\n\n    Any exception taken here will be fatal and silent.\n\n(2) When re-entering the resumed kernel, some DAIF bits will be clear\n    unexpectedly. This permits Debug, SError, or pseudo-NMI exceptions\n    to be taken for a short period while the resumed kernel is not yet\n    in a consistent state.\n\n    This is detected by CONFIG_ARM64_DEBUG_PRIORITY_MASKING.\n\nAvoid these issues by masking all DAIF exceptions during resume.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/012823494e20c3cce622982ebd3fd6971be39ad2","tags":[]},{"url":"https://git.kernel.org/stable/c/099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda","tags":[]},{"url":"https://git.kernel.org/stable/c/290c5b0c9fc0c61fb1c41421ed2394f955206ea0","tags":[]},{"url":"https://git.kernel.org/stable/c/5370853041a3cb53a125b77528586278f64b378b","tags":[]},{"url":"https://git.kernel.org/stable/c/684bde100117931f4c51c644a95f42f2dab041bc","tags":[]},{"url":"https://git.kernel.org/stable/c/716c41bd476334afb943308be9ff2142e34461b7","tags":[]},{"url":"https://git.kernel.org/stable/c/c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec","tags":[]},{"url":"https://git.kernel.org/stable/c/d736ace2c491623c9ab5e73744085e93e9ae3ebe","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}