{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43086","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:55.983Z","datePublished":"2026-05-06T07:40:20.631Z","dateUpdated":"2026-05-11T22:17:27.288Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:17:27.288Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_ctl.c"],"versions":[{"version":"705dd34440812735ece298eb5bc153fde9544d42","lessThan":"730663352c9178f33fcf5929f4a37c1f1ca5a693","status":"affected","versionType":"git"},{"version":"705dd34440812735ece298eb5bc153fde9544d42","lessThan":"4039959315008888dd53c37674d33351817a5166","status":"affected","versionType":"git"},{"version":"705dd34440812735ece298eb5bc153fde9544d42","lessThan":"a32dabacee111cea083ddd57a03635672e1bff29","status":"affected","versionType":"git"},{"version":"705dd34440812735ece298eb5bc153fde9544d42","lessThan":"c2ddbe577e2ebf63f2d8fb15cdc7503af70f3e94","status":"affected","versionType":"git"},{"version":"705dd34440812735ece298eb5bc153fde9544d42","lessThan":"9a91797e61d286805ae10a92cc48959c30800556","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_ctl.c"],"versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","status":"unaffected","versionType":"semver"},{"version":"6.6.136","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.83","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.24","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.14","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.0"}]}]}],"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"}}}}