CVE-2026-74469
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.
How to fix
- Linux Linuxb453e00da1211e997b82743d28af7714c59c05c8, dfea32dd76f390e3155177b0038cc47b01386198, 80f48523a0fe42db2e7375dff4e38a25c117090a, 546221b86ceeba0d8fec92d46a0604bb7b62be07, 09e722030e8148ba4ed1e42c6b2ea57bda9f9895, 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0, 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75, bd0e9289e2642f6a5c54faad304ce0f41e926d22 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < b453e00da1211e997b82743d28af7714c59c05c8, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < dfea32dd76f390e3155177b0038cc47b01386198, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < 80f48523a0fe42db2e7375dff4e38a25c117090a, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < 546221b86ceeba0d8fec92d46a0604bb7b62be07, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < 09e722030e8148ba4ed1e42c6b2ea57bda9f9895, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75, 8f840e47f190cbe61a96945c13e9551048d42cef ≤ v < bd0e9289e2642f6a5c54faad304ce0f41e926d22, 4.7 | b453e00da1211e997b82743d28af7714c59c05c8, dfea32dd76f390e3155177b0038cc47b01386198, 80f48523a0fe42db2e7375dff4e38a25c117090a, 546221b86ceeba0d8fec92d46a0604bb7b62be07, 09e722030e8148ba4ed1e42c6b2ea57bda9f9895, 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0, 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75, bd0e9289e2642f6a5c54faad304ce0f41e926d22 |
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