{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-42490 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-42490 is a medium-severity vulnerability in Xen, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42490 and fix it if it is affected.\n\nWhat it is: CVE-2026-42490 is a medium-severity vulnerability in Xen, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-42490 in the wild and no public exploit code.\n\nAffected product: Xen. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42490/ (Markdown: https://insights.sbomify.com/CVE-2026-42490/index.md)","id":"CVE-2026-42490","markdown":"https://insights.sbomify.com/CVE-2026-42490/index.md","name":"CVE-2026-42490","record":{"aliases":["ALPINE-CVE-2026-42490","DEBIAN-CVE-2026-42490","GHSA-9xq7-8p44-p7p4","UBUNTU-CVE-2026-42490"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Xen hypervisor","requires_auth":"low_privilege","summary":"Attackers can cause denial of service in Xen hypervisor by exploiting a lock fairness issue when XSM/Flask is enabled.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"XEN","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-667","name":"Improper Locking"}],"description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo create and manage guests, domctl operations are used by the control\ndomain, a possible Xenstore domain, or by a domain controlling a\nparticular guest.  Some of these operations may not be executed in\nparallel, so a system-wide lock is used.  The way that lock is acquired\nis, however, not providing any fairness.  This is CVE-2026-42489.\n\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.  This is\nCVE-2026-42490.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"domctl lock open to abuse","id":"CVE-2026-42490","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"race_condition","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"vIRQ event channel binding may break Xenstore","id":"CVE-2026-42492"},"packages":[],"prev":{"headline":"domctl lock open to abuse","id":"CVE-2026-42489"},"products":["Xen"],"published":"2026-06-18","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-18","vendors":["Xen"]},"summary":"Attackers can cause denial of service in Xen hypervisor by exploiting a lock fairness issue when XSM/Flask is enabled.","url":"https://insights.sbomify.com/CVE-2026-42490/"}