{"api_version":"1","generated_at":"2026-05-09T12:05:22+00:00","cve":"CVE-2026-43374","urls":{"html":"https://cve.report/CVE-2026-43374","api":"https://cve.report/api/cve/CVE-2026-43374.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43374","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43374"},"summary":{"title":"net: nexthop: fix percpu use-after-free in remove_nh_grp_entry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix percpu use-after-free in remove_nh_grp_entry\n\nWhen removing a nexthop from a group, remove_nh_grp_entry() publishes\nthe new group via rcu_assign_pointer() then immediately frees the\nremoved entry's percpu stats with free_percpu(). However, the\nsynchronize_net() grace period in the caller remove_nexthop_from_groups()\nruns after the free. RCU readers that entered before the publish still\nsee the old group and can dereference the freed stats via\nnh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a\nuse-after-free on percpu memory.\n\nFix by deferring the free_percpu() until after synchronize_net() in the\ncaller. Removed entries are chained via nh_list onto a local deferred\nfree list. After the grace period completes and all RCU readers have\nfinished, the percpu stats are safely freed.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:48","updated_at":"2026-05-08 15:16:48"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2","name":"https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924","name":"https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231","name":"https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7","name":"https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43374","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43374","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4676ea74b8549cd88dbfe2a592ce4530039e61f abf4feaee6405f1441929c6ebe7a250f2cd170a7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4676ea74b8549cd88dbfe2a592ce4530039e61f ab5ebab9664214ba41a7633cb4e72f128204f924 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4676ea74b8549cd88dbfe2a592ce4530039e61f 9e08ad731862b22a87cc55f752e16d66cdc9e231 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4676ea74b8549cd88dbfe2a592ce4530039e61f b2662e7593e94ae09b1cf7ee5f09160a3612bcb2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/nexthop.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"abf4feaee6405f1441929c6ebe7a250f2cd170a7","status":"affected","version":"f4676ea74b8549cd88dbfe2a592ce4530039e61f","versionType":"git"},{"lessThan":"ab5ebab9664214ba41a7633cb4e72f128204f924","status":"affected","version":"f4676ea74b8549cd88dbfe2a592ce4530039e61f","versionType":"git"},{"lessThan":"9e08ad731862b22a87cc55f752e16d66cdc9e231","status":"affected","version":"f4676ea74b8549cd88dbfe2a592ce4530039e61f","versionType":"git"},{"lessThan":"b2662e7593e94ae09b1cf7ee5f09160a3612bcb2","status":"affected","version":"f4676ea74b8549cd88dbfe2a592ce4530039e61f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/nexthop.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix percpu use-after-free in remove_nh_grp_entry\n\nWhen removing a nexthop from a group, remove_nh_grp_entry() publishes\nthe new group via rcu_assign_pointer() then immediately frees the\nremoved entry's percpu stats with free_percpu(). However, the\nsynchronize_net() grace period in the caller remove_nexthop_from_groups()\nruns after the free. RCU readers that entered before the publish still\nsee the old group and can dereference the freed stats via\nnh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a\nuse-after-free on percpu memory.\n\nFix by deferring the free_percpu() until after synchronize_net() in the\ncaller. Removed entries are chained via nh_list onto a local deferred\nfree list. After the grace period completes and all RCU readers have\nfinished, the percpu stats are safely freed."}],"providerMetadata":{"dateUpdated":"2026-05-08T14:21:24.537Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/abf4feaee6405f1441929c6ebe7a250f2cd170a7"},{"url":"https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924"},{"url":"https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231"},{"url":"https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2"}],"title":"net: nexthop: fix percpu use-after-free in remove_nh_grp_entry","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43374","datePublished":"2026-05-08T14:21:24.537Z","dateReserved":"2026-05-01T14:12:56.006Z","dateUpdated":"2026-05-08T14:21:24.537Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:48","lastModifiedDate":"2026-05-08 15:16:48","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43374","Ordinal":"1","Title":"net: nexthop: fix percpu use-after-free in remove_nh_grp_entry","CVE":"CVE-2026-43374","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43374","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix percpu use-after-free in remove_nh_grp_entry\n\nWhen removing a nexthop from a group, remove_nh_grp_entry() publishes\nthe new group via rcu_assign_pointer() then immediately frees the\nremoved entry's percpu stats with free_percpu(). However, the\nsynchronize_net() grace period in the caller remove_nexthop_from_groups()\nruns after the free. RCU readers that entered before the publish still\nsee the old group and can dereference the freed stats via\nnh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a\nuse-after-free on percpu memory.\n\nFix by deferring the free_percpu() until after synchronize_net() in the\ncaller. Removed entries are chained via nh_list onto a local deferred\nfree list. After the grace period completes and all RCU readers have\nfinished, the percpu stats are safely freed.","Type":"Description","Title":"net: nexthop: fix percpu use-after-free in remove_nh_grp_entry"}]}}}