{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40266 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40266 is a high-severity memory corruption vulnerability in Linux, published on 4 Dec 2025. 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-2025-40266 and fix it if it is affected.\n\nWhat it is: CVE-2025-40266 is a high-severity memory corruption vulnerability in Linux, published on 4 Dec 2025. 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-2025-40266 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-2025-40266/ (Markdown: https://insights.sbomify.com/CVE-2025-40266/index.md)","id":"CVE-2025-40266","markdown":"https://insights.sbomify.com/CVE-2025-40266/index.md","name":"CVE-2025-40266","record":{"aliases":["A-439862698","ASB-A-439862698","AZL-71422","BELL-CVE-2025-40266","DEBIAN-CVE-2025-40266","GHSA-3fjr-pmvp-g6q5","ROOT-OS-DEBIAN-11-CVE-2025-40266","ROOT-OS-DEBIAN-12-CVE-2025-40266","ROOT-OS-DEBIAN-13-CVE-2025-40266","ROOT-OS-UBUNTU-2204-CVE-2025-40266","ROOT-OS-UBUNTU-2404-CVE-2025-40266","UBUNTU-CVE-2025-40266"],"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 KVM","requires_auth":"high_privilege","summary":"A missing bounds check in the Linux kernel KVM arm64 FF-A memory share allows out-of-bounds access, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:H/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\nKVM: arm64: Check the untrusted offset in FF-A memory share\n\nVerify the offset to prevent OOB access in the hypervisor\nFF-A buffer in case an untrusted large enough value\n[U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX]\nis set from the host kernel.","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":"KVM: arm64: Check the untrusted offset in FF-A memory share","id":"CVE-2025-40266","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"io_uring/rw: ensure allocated iovec gets cleared for early failure","id":"CVE-2025-40267"},"packages":[],"prev":{"headline":"vfat: fix missing sb_min_blocksize() return value checks","id":"CVE-2025-40265"},"products":["Linux"],"published":"2025-12-04","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":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A missing bounds check in the Linux kernel KVM arm64 FF-A memory share allows out-of-bounds access, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2025-40266/"}