{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-31406 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-31406 is a high-severity use after free vulnerability in Linux kernel, published on 6 Apr 2026. 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-2026-31406 and fix it if it is affected.\n\nWhat it is: CVE-2026-31406 is a high-severity use after free vulnerability in Linux kernel, published on 6 Apr 2026. 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-2026-31406 in the wild and no public exploit code.\n\nAffected product: Linux kernel. 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-2026-31406/ (Markdown: https://insights.sbomify.com/CVE-2026-31406/index.md)","id":"CVE-2026-31406","markdown":"https://insights.sbomify.com/CVE-2026-31406/index.md","name":"CVE-2026-31406","record":{"aliases":["BELL-CVE-2026-31406","DEBIAN-CVE-2026-31406","GHSA-pfp5-r4vh-w3r6","ROOT-OS-DEBIAN-13-CVE-2026-31406","UBUNTU-CVE-2026-31406"],"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","requires_auth":"low_privilege","summary":"A race condition in the Linux kernel's xfrm module allows use-after-free, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"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\nxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()\n\nAfter cancel_delayed_work_sync() is called from\nxfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining\nstates via __xfrm_state_delete(), which calls\nxfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.\n\nThe following is a simple race scenario:\n\n           cpu0                             cpu1\n\ncleanup_net() [Round 1]\n  ops_undo_list()\n    xfrm_net_exit()\n      xfrm_nat_keepalive_net_fini()\n        cancel_delayed_work_sync(nat_keepalive_work);\n      xfrm_state_fini()\n        xfrm_state_flush()\n          xfrm_state_delete(x)\n            __xfrm_state_delete(x)\n              xfrm_nat_keepalive_state_updated(x)\n                schedule_delayed_work(nat_keepalive_work);\n  rcu_barrier();\n  net_complete_free();\n  net_passive_dec(net);\n    llist_add(\u0026net-\u003edefer_free_list, \u0026defer_free_list);\n\ncleanup_net() [Round 2]\n  rcu_barrier();\n  net_complete_free()\n    kmem_cache_free(net_cachep, net);\n                                     nat_keepalive_work()\n                                       // on freed net\n\nTo prevent this, cancel_delayed_work_sync() is replaced with\ndisable_delayed_work_sync().","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":"xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()","id":"CVE-2026-31406","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"netfilter: conntrack: add missing netlink policy validations","id":"CVE-2026-31407"},"packages":[],"prev":{"headline":"media: dvb-net: fix OOB access in ULE extension header tables","id":"CVE-2026-31405"},"products":["Linux"],"published":"2026-04-06","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A race condition in the Linux kernel's xfrm module allows use-after-free, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2026-31406/"}