ip: orphan prefetched skbs before multicast forwarding
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.111, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 · fixed in 882212d317a7c16ab70d20656f6b1c42abada9f6; From cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 · fixed in e62aef7d6a5b27569bf540bbe11a9482117ff588; From cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 · fixed in a8af6fbac895f057c4b8ff8a2e3fb4c5827fe4ce; From cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 · fixed in f1281d4b99089fbaf0d3579bba62a814ebb4de4d; From cf7fbe660f2dbd738ab58aea8e9b0ca6ad232449 · fixed in e36ce6e78fe3fc3c071a26750783b7ba081ce10d
- Linux Linux
5.7
- KernelLinux
From 5.7.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4