{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40236 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40236 is a vulnerability in Linux, published on 4 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40236 and fix it if it is affected.\n\nWhat it is: CVE-2025-40236 is a vulnerability in Linux, published on 4 Dec 2025. 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-2025-40236 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-2025-40236/ (Markdown: https://insights.sbomify.com/CVE-2025-40236/index.md)","id":"CVE-2025-40236","markdown":"https://insights.sbomify.com/CVE-2025-40236/index.md","name":"CVE-2025-40236","record":{"aliases":["BELL-CVE-2025-40236","DEBIAN-CVE-2025-40236","GHSA-gp3c-chw3-pxcc","UBUNTU-CVE-2025-40236"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"An attacker can read uninitialized memory from virtio-net tunnel headers, potentially leaking sensitive kernel data.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: zero unused hash fields\n\nWhen GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to\ninitialize the tunnel metadata but forget to zero unused rxhash\nfields. This may leak information to another side. Fixing this by\nzeroing the unused hash fields.","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":"virtio-net: zero unused hash fields","id":"CVE-2025-40236","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2025"},"n_packages":0,"n_references":2,"next":{"headline":"fs/notify: call exportfs_encode_fid with s_umount","id":"CVE-2025-40237"},"packages":[],"prev":{"headline":"btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()","id":"CVE-2025-40235"},"products":["Linux"],"published":"2025-12-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"An attacker can read uninitialized memory from virtio-net tunnel headers, potentially leaking sensitive kernel data.","url":"https://insights.sbomify.com/CVE-2025-40236/"}