{"api_version":"1","generated_at":"2026-08-13T15:49:57+00:00","cve":"CVE-2024-56655","urls":{"html":"https://cve.report/CVE-2024-56655","api":"https://cve.report/api/cve/CVE-2024-56655.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-56655","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-56655"},"summary":{"title":"netfilter: nf_tables: do not defer rule destruction via call_rcu","description":"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 ->use 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 <TASK>\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.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-12-27 15:15:25","updated_at":"2026-08-04 11:22:18"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048","name":"https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3","name":"https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb","name":"https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76","name":"https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed","name":"https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862","name":"https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043","name":"https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-56655","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56655","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9eee6097ffb26cdd2adb988c0d378fa0d650c737 5146c27b2780aac59876a887a5f4e793b8949862 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 558f503f707f481bbf40efa74a938b8021df841d 2991dc357a28b61c13ed1f7b59e9251e2b4562fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a394c160d57f4b083bd904a22802f6fb7f5b3cea b8d8f53e1858178882b881b8c09f94ef0e83bf76 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6c32a64d61184c2bdf89442b3d31ef530afba34 b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bfd05c68e4c6320304e9f371ffa356b6e4b9cc53 27f0574253f6c24c8ee4e3f0a685b75ed3a256ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c03d278fdf35e73dd0ec543b9b556876b9d9a8dc 7cf0bd232b565d9852cb25fd094f77254773e048 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c03d278fdf35e73dd0ec543b9b556876b9d9a8dc b04df3da1b5c6f6dc7cdccc37941740c078c4043 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cb401e5799e0acacb405f2128097e9c4ccf82f8a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.61 6.6.67 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11.8 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.67 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.6 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2024","cve_id":"56655","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/netfilter/nf_tables.h","net/netfilter/nf_tables_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5146c27b2780aac59876a887a5f4e793b8949862","status":"affected","version":"9eee6097ffb26cdd2adb988c0d378fa0d650c737","versionType":"git"},{"lessThan":"2991dc357a28b61c13ed1f7b59e9251e2b4562fb","status":"affected","version":"558f503f707f481bbf40efa74a938b8021df841d","versionType":"git"},{"lessThan":"b8d8f53e1858178882b881b8c09f94ef0e83bf76","status":"affected","version":"a394c160d57f4b083bd904a22802f6fb7f5b3cea","versionType":"git"},{"lessThan":"b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3","status":"affected","version":"e6c32a64d61184c2bdf89442b3d31ef530afba34","versionType":"git"},{"lessThan":"27f0574253f6c24c8ee4e3f0a685b75ed3a256ed","status":"affected","version":"bfd05c68e4c6320304e9f371ffa356b6e4b9cc53","versionType":"git"},{"lessThan":"7cf0bd232b565d9852cb25fd094f77254773e048","status":"affected","version":"c03d278fdf35e73dd0ec543b9b556876b9d9a8dc","versionType":"git"},{"lessThan":"b04df3da1b5c6f6dc7cdccc37941740c078c4043","status":"affected","version":"c03d278fdf35e73dd0ec543b9b556876b9d9a8dc","versionType":"git"},{"status":"affected","version":"cb401e5799e0acacb405f2128097e9c4ccf82f8a","versionType":"git"},{"lessThan":"6.6.67","status":"affected","version":"6.6.61","versionType":"semver"},{"lessThan":"6.12","status":"affected","version":"6.11.8","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/netfilter/nf_tables.h","net/netfilter/nf_tables_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.12"},{"lessThan":"6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.67","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.13","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.67","versionStartIncluding":"6.6.61","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.6","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.13","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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 ->use 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 <TASK>\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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:39:20.592Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862"},{"url":"https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb"},{"url":"https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76"},{"url":"https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3"},{"url":"https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed"},{"url":"https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048"},{"url":"https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043"}],"title":"netfilter: nf_tables: do not defer rule destruction via call_rcu","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-56655","datePublished":"2024-12-27T15:06:19.033Z","dateReserved":"2024-12-27T15:00:39.841Z","dateUpdated":"2026-08-04T09:39:20.592Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-12-27 15:15:25","lastModifiedDate":"2026-08-04 11:22:18","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.61","versionEndExcluding":"6.6.67","matchCriteriaId":"C62FB1DE-4AB5-4D7C-98C4-53F3C7625780"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.8","versionEndExcluding":"6.12.6","matchCriteriaId":"08380928-8FCA-4224-BB24-9918A2D1E85E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*","matchCriteriaId":"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*","matchCriteriaId":"5A073481-106D-4B15-B4C7-FB0213B8E1D4"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"56655","Ordinal":"1","Title":"netfilter: nf_tables: do not defer rule destruction via call_rcu","CVE":"CVE-2024-56655","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"56655","Ordinal":"1","NoteData":"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 ->use 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 <TASK>\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.","Type":"Description","Title":"netfilter: nf_tables: do not defer rule destruction via call_rcu"}]}}}