Description
In the Linux kernel, the following vulnerability has been resolved: ip: orphan prefetched skbs before multicast forwarding IPv4 and IPv6 input preserve an skb->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. When a multicast packet is not locally deliverable, IPv6 hands the original skb to ip6_mr_input(). IPv4'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. After the prefetched socket is destroyed, a later skb free invokes sock_pfree() and dereferences the stale skb->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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < 592b91f41d4f35e37c9e0be1c46a4c28437642cdaffectedcf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < 882212d317a7c16ab70d20656f6b1c42abada9f6affectedcf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < e62aef7d6a5b27569bf540bbe11a9482117ff588affectedcf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ceaffectedcf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < f1281d4b99089fbaf0d3579bba62a814ebb4de4daffectedcf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 to < e36ce6e78fe3fc3c071a26750783b7ba081ce10daffected
Linux Linux
Default version status: affected
5.7affected0 to < 5.7unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/592b91f41d4f35e37c9e0be1c46a4c28437642cd ↗
- https://git.kernel.org/stable/c/882212d317a7c16ab70d20656f6b1c42abada9f6 ↗
- https://git.kernel.org/stable/c/e62aef7d6a5b27569bf540bbe11a9482117ff588 ↗
- https://git.kernel.org/stable/c/a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce ↗
- https://git.kernel.org/stable/c/f1281d4b99089fbaf0d3579bba62a814ebb4de4d ↗
- https://git.kernel.org/stable/c/e36ce6e78fe3fc3c071a26750783b7ba081ce10d ↗