{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-42492 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-42492 is a high-severity vulnerability in Xen, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42492 and fix it if it is affected.\n\nWhat it is: CVE-2026-42492 is a high-severity vulnerability in Xen, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-42492 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-2026-42492/ (Markdown: https://insights.sbomify.com/CVE-2026-42492/index.md)","id":"CVE-2026-42492","markdown":"https://insights.sbomify.com/CVE-2026-42492/index.md","name":"CVE-2026-42492","record":{"aliases":["ALPINE-CVE-2026-42492","GHSA-2hv5-3qjg-gjqr","UBUNTU-CVE-2026-42492"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Xen hypervisor","requires_auth":"none","summary":"Unprivileged domains can trigger an error path that tears down an uninitialized bitmap, breaking Xenstore and causing denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"XEN","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-459","name":"Incomplete Cleanup"}],"description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","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":"vIRQ event channel binding may break Xenstore","id":"CVE-2026-42492","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"x86 shadow paging is deprecated","id":"CVE-2026-42493"},"packages":[],"prev":{"headline":"domctl lock open to abuse","id":"CVE-2026-42490"},"products":["Xen"],"published":"2026-07-28","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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-28","vendors":["Xen"]},"summary":"Unprivileged domains can trigger an error path that tears down an uninitialized bitmap, breaking Xenstore and causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-42492/"}