{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40139 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40139 is a high-severity use after free 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-2025-40139 and fix it if it is affected.\n\nWhat it is: CVE-2025-40139 is a high-severity use after free 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-2025-40139 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-2025-40139/ (Markdown: https://insights.sbomify.com/CVE-2025-40139/index.md)","id":"CVE-2025-40139","markdown":"https://insights.sbomify.com/CVE-2025-40139/index.md","name":"CVE-2025-40139","record":{"aliases":["AZL-69998","BELL-CVE-2025-40139","DEBIAN-CVE-2025-40139","GHSA-ffj5-vpjf-2hxm","ROOT-OS-DEBIAN-11-CVE-2025-40139","ROOT-OS-DEBIAN-12-CVE-2025-40139","ROOT-OS-DEBIAN-13-CVE-2025-40139","ROOT-OS-UBUNTU-2204-CVE-2025-40139","ROOT-OS-UBUNTU-2404-CVE-2025-40139","UBUNTU-CVE-2025-40139"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel SMC","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel's SMC protocol allows attackers to potentially execute code or cause a denial of service during connection setup.","user_interaction":"not_required","vuln_class":"use_after_free"},"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\nsmc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().\n\nsmc_clc_prfx_set() is called during connect() and not under RCU\nnor RTNL.\n\nUsing sk_dst_get(sk)-\u003edev could trigger UAF.\n\nLet's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock()\nafter kernel_getsockname().\n\nNote that the returned value of smc_clc_prfx_set() is not used\nin the caller.\n\nWhile at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu()\nnot to touch dst there.","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":"smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().","id":"CVE-2025-40139","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast","id":"CVE-2025-40140"},"packages":[],"prev":{"headline":"f2fs: fix to avoid NULL pointer dereference in f2fs_check_quota_consistency()","id":"CVE-2025-40138"},"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":"A use-after-free vulnerability in the Linux kernel's SMC protocol allows attackers to potentially execute code or cause a denial of service during connection setup.","url":"https://insights.sbomify.com/CVE-2025-40139/"}