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CVE-2026-93256

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 5.15.221, <290c5b0c9fc0c61fb1c41421ed2394f955206ea0, <c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec, 0, 5.10.270, <012823494e20c3cce622982ebd3fd6971be39ad2, 6.1.188, 6.18.52, <716c41bd476334afb943308be9ff2142e34461b7, <=5.10.*, <=6.6.*, 6.6.157, <099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda, <d736ace2c491623c9ab5e73744085e93e9ae3ebe, 7.2.6, <5370853041a3cb53a125b77528586278f64b378b, 4.7, <684bde100117931f4c51c644a95f42f2dab041bc, 82869ac57b5d3b550446932c918dbf2caf020c9e, <=6.18.*, 6.12.110, <=7.2.*, <=*, <=5.15.*, <4.7, 7.3

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.

Gravité et risque d'exploitation

CVE-2026-93256 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.15.221, <290c5b0c9fc0c61fb1c41421ed2394f955206ea0, <c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec, 0, 5.10.270, <012823494e20c3cce622982ebd3fd6971be39ad2, 6.1.188, 6.18.52, <716c41bd476334afb943308be9ff2142e34461b7, <=5.10.*, <=6.6.*, 6.6.157, <099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda, <d736ace2c491623c9ab5e73744085e93e9ae3ebe, 7.2.6, <5370853041a3cb53a125b77528586278f64b378b, 4.7, <684bde100117931f4c51c644a95f42f2dab041bc, 82869ac57b5d3b550446932c918dbf2caf020c9e, <=6.18.*, 6.12.110, <=7.2.*, <=*, <=5.15.*, <4.7, 7.3) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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