{"id":"CVE-2024-56655","summary":"netfilter: nf_tables: do not defer rule destruction via call_rcu","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: do not defer rule destruction via call_rcu\n\nnf_tables_chain_destroy can sleep, it can't be used from call_rcu\ncallbacks.\n\nMoreover, nf_tables_rule_release() is only safe for error unwinding,\nwhile transaction mutex is held and the to-be-desroyed rule was not\nexposed to either dataplane or dumps, as it deactives+frees without\nthe required synchronize_rcu() in-between.\n\nnft_rule_expr_deactivate() callbacks will change -\u003euse counters\nof other chains/sets, see e.g. nft_lookup .deactivate callback, these\nmust be serialized via transaction mutex.\n\nAlso add a few lockdep asserts to make this more explicit.\n\nCalling synchronize_rcu() isn't ideal, but fixing this without is hard\nand way more intrusive.  As-is, we can get:\n\nWARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x..\nWorkqueue: events nf_tables_trans_destroy_work\nRIP: 0010:nft_set_destroy+0x3fe/0x5c0\nCall Trace:\n \u003cTASK\u003e\n nf_tables_trans_destroy_work+0x6b7/0xad0\n process_one_work+0x64a/0xce0\n worker_thread+0x613/0x10d0\n\nIn case the synchronize_rcu becomes an issue, we can explore alternatives.\n\nOne way would be to allocate nft_trans_rule objects + one nft_trans_chain\nobject, deactivate the rules + the chain and then defer the freeing to the\nnft destroy workqueue.  We'd still need to keep the synchronize_rcu path as\na fallback to handle -ENOMEM corner cases though.","modified":"2026-03-20T12:40:56.578790Z","published":"2024-12-27T15:06:19.033Z","related":["MGASA-2025-0030","MGASA-2025-0032","USN-7379-2","USN-7380-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56655.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56655.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56655"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9eee6097ffb26cdd2adb988c0d378fa0d650c737"},{"fixed":"5146c27b2780aac59876a887a5f4e793b8949862"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"558f503f707f481bbf40efa74a938b8021df841d"},{"fixed":"2991dc357a28b61c13ed1f7b59e9251e2b4562fb"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a394c160d57f4b083bd904a22802f6fb7f5b3cea"},{"fixed":"b8d8f53e1858178882b881b8c09f94ef0e83bf76"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e6c32a64d61184c2bdf89442b3d31ef530afba34"},{"fixed":"b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bfd05c68e4c6320304e9f371ffa356b6e4b9cc53"},{"fixed":"27f0574253f6c24c8ee4e3f0a685b75ed3a256ed"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c03d278fdf35e73dd0ec543b9b556876b9d9a8dc"},{"fixed":"7cf0bd232b565d9852cb25fd094f77254773e048"},{"fixed":"b04df3da1b5c6f6dc7cdccc37941740c078c4043"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"cb401e5799e0acacb405f2128097e9c4ccf82f8a"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-56655.json"}}],"schema_version":"1.7.5"}