https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 05:42:44 +0000 https://vulnerability.circl.lu/vuln/cve-2026-89564 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ip: orphan prefetched skbs before multicast forwarding</p> <p>IPv4 and IPv6 input preserve an skb-&gt;sk association installed by bpf_sk_assign() so that local delivery can use the selected socket under RCU. Both address families can also prefetch a socket in UDP early demux. In both paths (BPF and UDP early demux) a reference is not guaranteed to be held on the socket.</p> <p>When a multicast packet is not locally deliverable, IPv6 hands the original skb to ip6_mr_input(). IPv4&#39;s ip_mr_input() similarly keeps the original skb when local delivery is not needed. Either path can put the skb on an unresolved multicast route queue or forward it after the receive-side RCU section ends.</p> <p>After the prefetched socket is destroyed, a later skb free invokes sock_pfree() and dereferences the stale skb-&gt;sk. Orphan the skb before each non-local multicast forwarding path. Local delivery retains the original skb; the existing skb_clone() calls provide multicast forwarding with a socket-free clone.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>ip: orphan prefetched skbs before multicast forwarding</p> <p>IPv4 and IPv6 input preserve an skb-&gt;sk association installed by bpf_sk_assign() so that local delivery can use the selected socket under RCU. Both address families can also prefetch a socket in UDP early demux. In both paths (BPF and UDP early demux) a reference is not guaranteed to be held on the socket.</p> <p>When a multicast packet is not locally deliverable, IPv6 hands the original skb to ip6_mr_input(). IPv4&#39;s ip_mr_input() similarly keeps the original skb when local delivery is not needed. Either path can put the skb on an unresolved multicast route queue or forward it after the receive-side RCU section ends.</p> <p>After the prefetched socket is destroyed, a later skb free invokes sock_pfree() and dereferences the stale skb-&gt;sk. Orphan the skb before each non-local multicast forwarding path. Local delivery retains the original skb; the existing skb_clone() calls provide multicast forwarding with a socket-free clone.</p> https://vulnerability.circl.lu/vuln/cve-2026-89564