{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-79603 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-79603 is a medium-severity vulnerability in Xen, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-79603 and fix it if it is affected.\n\nWhat it is: CVE-2026-79603 is a medium-severity vulnerability in Xen, published on 8 Sep 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-2026-79603 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-2026-79603/ (Markdown: https://insights.sbomify.com/CVE-2026-79603/index.md)","id":"CVE-2026-79603","markdown":"https://insights.sbomify.com/CVE-2026-79603/index.md","name":"CVE-2026-79603","record":{"aliases":["ALPINE-CVE-2026-79603","DEBIAN-CVE-2026-79603","GHSA-pwv5-r8hr-fvgr","UBUNTU-CVE-2026-79603"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["data_modify","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"Xen hypervisor","requires_auth":"low_privilege","summary":"A race condition in Xen allows PV guests to modify scrubbed memory pages, potentially leading to data corruption or privilege escalation.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"XEN","cpe":[],"cvss":{"score":4.3,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-664","name":"Improper Control of a Resource Through its Lifetime"}],"description":"x86 PV guests can free memory pages while still keeping a stale TLB entry\npointing to them.  A TLB flush is only issued by Xen (if needed) when the\npage is re-used.  Since it's possible for the page to be scrubbed ahead of\nthe TLB flush, there's a window where a PV guest can modify an already\nscrubbed page.","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":"Unconditionally do TLB flushing ahead of page scrubbing","id":"CVE-2026-79603","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":"Xenstore: Guests can crash xenstored during Live Update","id":"CVE-2026-79607"},"packages":[],"prev":{"headline":"x86: improper handling of HVM emulation return codes","id":"CVE-2026-79602"},"products":["Xen"],"published":"2026-09-08","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":"2026-09-08","vendors":["Xen"]},"summary":"A race condition in Xen allows PV guests to modify scrubbed memory pages, potentially leading to data corruption or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-79603/"}