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CVE-2026-93256: Linux

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    Оригинално описание

    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.

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    • Linux Linux: 82869ac57b5d3b550446932c918dbf2caf020c9e преди c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 716c41bd476334afb943308be9ff2142e34461b7; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 5370853041a3cb53a125b77528586278f64b378b; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 290c5b0c9fc0c61fb1c41421ed2394f955206ea0; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 012823494e20c3cce622982ebd3fd6971be39ad2; 82869ac57b5d3b550446932c918dbf2caf020c9e преди d736ace2c491623c9ab5e73744085e93e9ae3ebe; 82869ac57b5d3b550446932c918dbf2caf020c9e преди 684bde100117931f4c51c644a95f42f2dab041bc
    • Linux Linux: 4.7; преди 4.7; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 24 септември 2026 Публикувано

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    CVE-2026-93256: Linux | freedomonline.bg