{"api_version":"1","generated_at":"2026-05-08T18:02:48+00:00","cve":"CVE-2026-43086","urls":{"html":"https://cve.report/CVE-2026-43086","api":"https://cve.report/api/cve/CVE-2026-43086.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43086","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43086"},"summary":{"title":"ipvs: fix NULL deref in ip_vs_add_service error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix NULL deref in ip_vs_add_service error path\n\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\nvariable sched is set to NULL.  If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL.  ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc->scheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched->done_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n  <TASK>\n  ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n  do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n  nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n  [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind.  ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc->scheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-06 10:16:21","updated_at":"2026-05-06 13:08:07"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29","name":"https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556","name":"https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166","name":"https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693","name":"https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94","name":"https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43086","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43086","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 730663352c9178f33fcf5929f4a37c1f1ca5a693 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 4039959315008888dd53c37674d33351817a5166 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 a32dabacee111cea083ddd57a03635672e1bff29 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 705dd34440812735ece298eb5bc153fde9544d42 9a91797e61d286805ae10a92cc48959c30800556 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.136 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.83 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.24 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.14 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/netfilter/ipvs/ip_vs_ctl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"730663352c9178f33fcf5929f4a37c1f1ca5a693","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"4039959315008888dd53c37674d33351817a5166","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"a32dabacee111cea083ddd57a03635672e1bff29","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"},{"lessThan":"9a91797e61d286805ae10a92cc48959c30800556","status":"affected","version":"705dd34440812735ece298eb5bc153fde9544d42","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/ipvs/ip_vs_ctl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.2"},{"lessThan":"6.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.136","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.83","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.24","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.14","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":"6.6.136","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.83","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.24","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.14","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix NULL deref in ip_vs_add_service error path\n\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\nvariable sched is set to NULL.  If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL.  ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc->scheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched->done_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n  <TASK>\n  ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n  do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n  nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n  [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind.  ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc->scheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call."}],"providerMetadata":{"dateUpdated":"2026-05-06T07:40:20.631Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693"},{"url":"https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166"},{"url":"https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29"},{"url":"https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"},{"url":"https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556"}],"title":"ipvs: fix NULL deref in ip_vs_add_service error path","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43086","datePublished":"2026-05-06T07:40:20.631Z","dateReserved":"2026-05-01T14:12:55.983Z","dateUpdated":"2026-05-06T07:40:20.631Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-06 10:16:21","lastModifiedDate":"2026-05-06 13:08:07","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43086","Ordinal":"1","Title":"ipvs: fix NULL deref in ip_vs_add_service error path","CVE":"CVE-2026-43086","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43086","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix NULL deref in ip_vs_add_service error path\n\nWhen ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local\nvariable sched is set to NULL.  If ip_vs_start_estimator() subsequently\nfails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched)\nwith sched == NULL.  ip_vs_unbind_scheduler() passes the cur_sched NULL\ncheck (because svc->scheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched->done_service, causing a\nkernel panic at offset 0x30 from NULL.\n\n Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]\n RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69)\n Call Trace:\n  <TASK>\n  ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500)\n  do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809)\n  nf_setsockopt (net/netfilter/nf_sockopt.c:102)\n  [..]\n\nFix by simply not clearing the local sched variable after a successful\nbind.  ip_vs_unbind_scheduler() already detects whether a scheduler is\ninstalled via svc->scheduler, and keeping sched non-NULL ensures the\nerror path passes the correct pointer to both ip_vs_unbind_scheduler()\nand ip_vs_scheduler_put().\n\nWhile the bug is older, the problem popups in more recent kernels (6.2),\nwhen the new error path is taken after the ip_vs_start_estimator() call.","Type":"Description","Title":"ipvs: fix NULL deref in ip_vs_add_service error path"}]}}}