Description
In the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.
References8
- git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895
- git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0
- git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07
- git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75
- git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a
- git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8
- git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22
- git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 74 · as of 11 November 2026
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