{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40173 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40173 is a high-severity denial of service vulnerability in Linux, published on 12 Nov 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-2025-40173 and fix it if it is affected.\n\nWhat it is: CVE-2025-40173 is a high-severity denial of service vulnerability in Linux, published on 12 Nov 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-2025-40173 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-2025-40173/ (Markdown: https://insights.sbomify.com/CVE-2025-40173/index.md)","id":"CVE-2025-40173","markdown":"https://insights.sbomify.com/CVE-2025-40173/index.md","name":"CVE-2025-40173","record":{"aliases":["AZL-70019","BELL-CVE-2025-40173","DEBIAN-CVE-2025-40173","GHSA-hr9g-hq4q-3hfj","ROOT-OS-DEBIAN-11-CVE-2025-40173","ROOT-OS-DEBIAN-13-CVE-2025-40173","ROOT-OS-UBUNTU-2404-CVE-2025-40173","UBUNTU-CVE-2025-40173"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"Attackers can cause a denial of service by triggering perpetual headroom growth in IPv6 tunnels, affecting Linux kernel users.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/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\nnet/ip6_tunnel: Prevent perpetual tunnel growth\n\nSimilarly to ipv4 tunnel, ipv6 version updates dev-\u003eneeded_headroom, too.\nWhile ipv4 tunnel headroom adjustment growth was limited in\ncommit 5ae1e9922bbd (\"net: ip_tunnel: prevent perpetual headroom growth\"),\nipv6 tunnel yet increases the headroom without any ceiling.\n\nReflect ipv4 tunnel headroom adjustment limit on ipv6 version.\n\nCredits to Francesco Ruggeri, who was originally debugging this issue\nand wrote local Arista-specific patch and a reproducer.","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":"net/ip6_tunnel: Prevent perpetual tunnel growth","id":"CVE-2025-40173","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":8,"next":{"headline":"x86/mm: Fix SMP ordering in switch_mm_irqs_off()","id":"CVE-2025-40174"},"packages":[],"prev":{"headline":"accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()","id":"CVE-2025-40172"},"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":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"Attackers can cause a denial of service by triggering perpetual headroom growth in IPv6 tunnels, affecting Linux kernel users.","url":"https://insights.sbomify.com/CVE-2025-40173/"}