{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40253 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40253 is a high-severity use after free 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-2025-40253 and fix it if it is affected.\n\nWhat it is: CVE-2025-40253 is a high-severity use after free 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-2025-40253 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-2025-40253/ (Markdown: https://insights.sbomify.com/CVE-2025-40253/index.md)","id":"CVE-2025-40253","markdown":"https://insights.sbomify.com/CVE-2025-40253/index.md","name":"CVE-2025-40253","record":{"aliases":["BELL-CVE-2025-40253","DEBIAN-CVE-2025-40253","GHSA-c7q5-6cjw-qjwq","ROOT-OS-DEBIAN-11-CVE-2025-40253","ROOT-OS-UBUNTU-2204-CVE-2025-40253","ROOT-OS-UBUNTU-2404-CVE-2025-40253","UBUNTU-CVE-2025-40253"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"none","summary":"A double-free vulnerability in the s390/ctcm Linux kernel driver allows attackers to cause a denial of service or potentially execute arbitrary code.","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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ctcm: Fix double-kfree\n\nThe function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally\nfrom function 'ctcmpc_unpack_skb'. It frees passed mpcginfo.\nAfter that a call to function 'kfree' in function 'ctcmpc_unpack_skb'\nfrees it again.\n\nRemove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'.\n\nBug detected by the clang static analyzer.","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":"s390/ctcm: Fix double-kfree","id":"CVE-2025-40253","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":8,"next":{"headline":"net: openvswitch: remove never-working support for setting nsh fields","id":"CVE-2025-40254"},"packages":[],"prev":{"headline":"net: qlogic/qede: fix potential out-of-bounds read in qede_tpa_cont() and qede_tpa_end()","id":"CVE-2025-40252"},"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":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A double-free vulnerability in the s390/ctcm Linux kernel driver allows attackers to cause a denial of service or potentially execute arbitrary code.","url":"https://insights.sbomify.com/CVE-2025-40253/"}