The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled When booting with the 'ipv6.disable=1'     parameter, the nd_tbl is never initialized because inet6_init() exits before ndisc_init() is called which     initializes it. Then, if neigh_suppress is enabled and an ICMPv6 Neighbor Discovery packet reaches the     bridge, br_do_suppress_nd() will dereference ipv6_stub->nd_tbl which is NULL, passing it to     neigh_lookup(). This causes a kernel NULL pointer dereference. BUG: kernel NULL pointer dereference,     address: 0000000000000268 Oops: 0000 [#1] PREEMPT SMP NOPTI [...] RIP: 0010:neigh_lookup+0x16/0xe0 [...]     Call Trace: <IRQ> ? neigh_lookup+0x16/0xe0 br_do_suppress_nd+0x160/0x290 [bridge]     br_handle_frame_finish+0x500/0x620 [bridge] br_handle_frame+0x353/0x440 [bridge]
    __netif_receive_skb_core.constprop.0+0x298/0x1110 __netif_receive_skb_one_core+0x3d/0xa0     process_backlog+0xa0/0x140 __napi_poll+0x2c/0x170 net_rx_action+0x2c4/0x3a0 handle_softirqs+0xd0/0x270     do_softirq+0x3f/0x60 Fix this by replacing IS_ENABLED(IPV6) call with ipv6_mod_enabled() in the callers.
    This is in essence disabling NS/NA suppression when IPv6 is disabled. (CVE-2026-23381)

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Linux Distros Unpatched Vulnerability : CVE-2026-23381

medium Nessus Plugin ID 303659

Version 1.2