{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-74520 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-74520 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-74520 and fix it if it is affected.\n\nWhat it is: CVE-2026-74520 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-74520 in the wild and no public exploit code.\n\nAffected product: Linux. 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-2026-74520/ (Markdown: https://insights.sbomify.com/CVE-2026-74520/index.md)","id":"CVE-2026-74520","markdown":"https://insights.sbomify.com/CVE-2026-74520/index.md","name":"CVE-2026-74520","record":{"aliases":["BELL-CVE-2026-74520","DEBIAN-CVE-2026-74520","GHSA-9qch-cxwm-9cjc","UBUNTU-CVE-2026-74520"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free in the Linux kernel IOMMUFD subsystem allows attackers to execute arbitrary code or escalate privileges via crafted IOPF group handling.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/iommufd: Fix IOPF group ownership UAF\n\niopf_group_alloc() links each last-page IOPF group into the generic IOPF\npending list before invoking the domain fault handler.\niommufd_fault_iopf_handler() also queued an accepted group in the\nIOMMUFD deliver list without removing it from the generic pending list.\n\nWhen detach or HWPT replacement drops the device's IOPF reference count\nto zero, an IOMMU driver may call iopf_queue_remove_device(). That\nfunction responds to and frees groups through the generic pending list\nwithout removing the same groups from IOMMUFD's deliver list or response\nxarray. A later read, response, or cleanup can then access the freed\ngroup and cause a UAF.\n\nFix this by dequeuing an accepted group from the generic pending list\nbefore IOMMUFD queues it for userspace response.\nMake iopf_group_response() send a response regardless of pending-list\nmembership, so the dequeued group can still be completed by IOMMUFD.","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":"iommu/iommufd: Fix IOPF group ownership UAF","id":"CVE-2026-74520","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"ksmbd: use memcmp() to compare ClientGUIDs","id":"CVE-2026-74521"},"packages":[],"prev":{"headline":"pinctrl: devicetree: don't free uninitialized dev_name on error path","id":"CVE-2026-74519"},"products":["Linux"],"published":"2026-08-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A use-after-free in the Linux kernel IOMMUFD subsystem allows attackers to execute arbitrary code or escalate privileges via crafted IOPF group handling.","url":"https://insights.sbomify.com/CVE-2026-74520/"}