Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 before 882212d317a7c16ab70d20656f6b1c42abada9f6; affected cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 before e62aef7d6a5b27569bf540bbe11a9482117ff588; affected cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 before a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce; affected cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 before f1281d4b99089fbaf0d3579bba62a814ebb4de4d; affected cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 before e36ce6e78fe3fc3c071a26750783b7ba081ce10d |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- 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
ADP enrichment
No English description supplied.
No references supplied.