{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40279 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40279 is a vulnerability in Linux, published on 6 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-2025-40279 and fix it if it is affected.\n\nWhat it is: CVE-2025-40279 is a vulnerability in Linux, published on 6 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-2025-40279 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-2025-40279/ (Markdown: https://insights.sbomify.com/CVE-2025-40279/index.md)","id":"CVE-2025-40279","markdown":"https://insights.sbomify.com/CVE-2025-40279/index.md","name":"CVE-2025-40279","record":{"aliases":["BELL-CVE-2025-40279","DEBIAN-CVE-2025-40279","GHSA-85ch-f4p7-jj7h","ROOT-OS-DEBIAN-11-CVE-2025-40279","ROOT-OS-DEBIAN-12-CVE-2025-40279","ROOT-OS-DEBIAN-13-CVE-2025-40279","ROOT-OS-UBUNTU-2204-CVE-2025-40279","ROOT-OS-UBUNTU-2404-CVE-2025-40279","UBUNTU-CVE-2025-40279"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can read uninitialized kernel memory via netlink messages due to improper structure initialization in the connmark action.","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\nnet: sched: act_connmark: initialize struct tc_ife to fix kernel leak\n\nIn tcf_connmark_dump(), the variable 'opt' was partially initialized using a\ndesignatied initializer. While the padding bytes are reamined\nuninitialized. nla_put() copies the entire structure into a\nnetlink message, these uninitialized bytes leaked to userspace.\n\nInitialize the structure with memset before assigning its fields\nto ensure all members and padding are cleared prior to beign copied.","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: sched: act_connmark: initialize struct tc_ife to fix kernel leak","id":"CVE-2025-40279","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2025"},"n_packages":0,"n_references":6,"next":{"headline":"tipc: Fix use-after-free in tipc_mon_reinit_self().","id":"CVE-2025-40280"},"packages":[],"prev":{"headline":"net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak","id":"CVE-2025-40278"},"products":["Linux"],"published":"2025-12-06","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":"A local attacker can read uninitialized kernel memory via netlink messages due to improper structure initialization in the connmark action.","url":"https://insights.sbomify.com/CVE-2025-40279/"}