{"id":"CVE-2026-43086","summary":"ipvs: fix NULL deref in ip_vs_add_service error path","details":"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-\u003escheduler was set by the successful bind) but then\ndereferences the NULL sched parameter at sched-\u003edone_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  \u003cTASK\u003e\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-\u003escheduler, 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.","modified":"2026-07-21T18:29:45.048522576Z","published":"2026-05-06T07:40:20.631Z","related":["SUSE-SU-2026:22521-1","SUSE-SU-2026:22522-1","SUSE-SU-2026:22665-1","SUSE-SU-2026:22666-1","SUSE-SU-2026:2799-1","SUSE-SU-2026:2800-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43086.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4039959315008888dd53c37674d33351817a5166"},{"type":"WEB","url":"https://git.kernel.org/stable/c/730663352c9178f33fcf5929f4a37c1f1ca5a693"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a91797e61d286805ae10a92cc48959c30800556"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a32dabacee111cea083ddd57a03635672e1bff29"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43086.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43086"},{"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":"705dd34440812735ece298eb5bc153fde9544d42"},{"fixed":"730663352c9178f33fcf5929f4a37c1f1ca5a693"},{"fixed":"4039959315008888dd53c37674d33351817a5166"},{"fixed":"a32dabacee111cea083ddd57a03635672e1bff29"},{"fixed":"c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94"},{"fixed":"9a91797e61d286805ae10a92cc48959c30800556"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43086.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43086.json"}}],"schema_version":"1.7.5"}