{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40158 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40158 is a high-severity use after free vulnerability in Linux, published on 12 Nov 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-2025-40158 and fix it if it is affected.\n\nWhat it is: CVE-2025-40158 is a high-severity use after free vulnerability in Linux, published on 12 Nov 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-2025-40158 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-2025-40158/ (Markdown: https://insights.sbomify.com/CVE-2025-40158/index.md)","id":"CVE-2025-40158","markdown":"https://insights.sbomify.com/CVE-2025-40158/index.md","name":"CVE-2025-40158","record":{"aliases":["AZL-70025","BELL-CVE-2025-40158","DEBIAN-CVE-2025-40158","GHSA-4g43-pmw7-v27w","ROOT-OS-DEBIAN-11-CVE-2025-40158","ROOT-OS-DEBIAN-12-CVE-2025-40158","ROOT-OS-DEBIAN-13-CVE-2025-40158","ROOT-OS-UBUNTU-2204-CVE-2025-40158","ROOT-OS-UBUNTU-2404-CVE-2025-40158","UBUNTU-CVE-2025-40158"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"A use-after-free vulnerability in the Linux kernel IPv6 output path allows attackers to potentially execute code or cause a system crash.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/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\nipv6: use RCU in ip6_output()\n\nUse RCU in ip6_output() in order to use dst_dev_rcu() to prevent\npossible UAF.\n\nWe can remove rcu_read_lock()/rcu_read_unlock() pairs\nfrom ip6_finish_output2().","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":"ipv6: use RCU in ip6_output()","id":"CVE-2025-40158","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"xsk: Harden userspace-supplied xdp_desc validation","id":"CVE-2025-40159"},"packages":[],"prev":{"headline":"EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller","id":"CVE-2025-40157"},"products":["Linux"],"published":"2025-11-12","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":"2026-10-21","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel IPv6 output path allows attackers to potentially execute code or cause a system crash.","url":"https://insights.sbomify.com/CVE-2025-40158/"}