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Permalink CVE-2026-42490
6.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): Low (L)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): Low (L)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
created 1 day, 12 hours ago Activity log
  • Created suggestion 1 day, 12 hours ago
domctl lock open to abuse

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.

Affected products

Xen
  • ==consult Xen advisory XSA-492

Matching in nixpkgs

pkgs.xen

Type-1 hypervisor intended for embedded and hyperscale use cases

pkgs.xenon

Monitoring tool based on radon

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

  • nixos-unstable -
    • nixpkgs-unstable
    • nixos-unstable-small
  • nixos-26.05 -
    • nixos-26.05-small
    • nixpkgs-26.05-darwin

pkgs.grub2_pvhgrub_image

None

  • nixos-unstable -
    • nixos-unstable-small
  • nixos-26.05 -
    • nixos-26.05-small
    • nixpkgs-26.05-darwin