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Untriaged
Permalink CVE-2026-62430
7.5 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): None (N)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): None (N)
created 1 week ago Activity log
  • Created suggestion 1 week ago
x86: Out-of-bounds read in vRTC emulation

Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache the guest chosen index, and one of the usages of the index didn't take the necessary locking to avoid concurrent changes. As a result, a guest could change the index after it being checked, causing a subsequent out-of-bound read access to the contents of an array.

Affected products

Xen
  • ==consult Xen advisory XSA-503

Matching in nixpkgs

pkgs.xen

Type-1 hypervisor intended for embedded and hyperscale use cases

pkgs.xenon

Monitoring tool based on radon

pkgs.hhexen

Linux port of Raven Game's Hexen

pkgs.uhexen2

Cross-platform port of Hexen II game

pkgs.xenomapper

Utility for post processing mapped reads that have been aligned to a primary genome and a secondary genome and binning reads into species specific, multimapping in each species, unmapped and unassigned bins

pkgs.nxengine-evo

Complete open-source clone/rewrite of the masterpiece jump-and-run platformer Doukutsu Monogatari (also known as Cave Story)

pkgs.grub2_pvgrub_image

PvGrub2 image for booting PV Xen guests

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    • nixos-unstable-small
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pkgs.grub2_pvhgrub_image

PvGrub2 image for booting PVH Xen guests

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pkgs.haskellPackages.xeno

A fast event-based XML parser in pure Haskell

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  • nixos-26.05 0.6
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    • nixpkgs-26.05-darwin 0.6