CVE-2026-43086
MediumCVSS 5.5Summary
W jądrze systemu Linux zidentyfikowano podatność, która prowadzi do dereferencji wskaźnika NULL w funkcji ip_vs_unbind_scheduler() w przypadku błędu w ip_vs_start_estimator(). Problem ten może spowodować panikę jądra, gdy lokalna zmienna sched jest ustawiona na NULL po udanym powiązaniu.
Risk Assessment
Podatność ta może prowadzić do awarii systemu, co wpływa na dostępność usług działających na serwerze. W przypadku wykorzystania tej luki, atakujący może spowodować nieprzewidziane zatrzymanie systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Należy również monitorować systemy pod kątem nieautoryzowanych zmian w konfiguracji usług.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ipvs: fix NULL deref in ip_vs_add_service error path When ip_vs_bind_scheduler() succeeds in ip_vs_add_service(), the local variable sched is set to NULL. If ip_vs_start_estimator() subsequently fails, the out_err cleanup calls ip_vs_unbind_scheduler(svc, sched) with sched == NULL. ip_vs_unbind_scheduler() passes the cur_sched NULL check (because svc->scheduler was set by the successful bind) but then dereferences the NULL sched parameter at sched->done_service, causing a kernel panic at offset 0x30 from NULL. Oops: general protection fault, [..] [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] RIP: 0010:ip_vs_unbind_scheduler (net/netfilter/ipvs/ip_vs_sched.c:69) Call Trace: <TASK> ip_vs_add_service.isra.0 (net/netfilter/ipvs/ip_vs_ctl.c:1500) do_ip_vs_set_ctl (net/netfilter/ipvs/ip_vs_ctl.c:2809) nf_setsockopt (net/netfilter/nf_sockopt.c:102) [..] Fix by simply not clearing the local sched variable after a successful bind. ip_vs_unbind_scheduler() already detects whether a scheduler is installed via svc->scheduler, and keeping sched non-NULL ensures the error path passes the correct pointer to both ip_vs_unbind_scheduler() and ip_vs_scheduler_put(). While the bug is older, the problem popups in more recent kernels (6.2), when the new error path is taken after the ip_vs_start_estimator() call.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS