CVE-2026-74469

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8f840e47f190cbe61a96945c13e9551048d42cef < 546221b86ceeba0d8fec92d46a0604bb7b62be07affected
LinuxLinux8f840e47f190cbe61a96945c13e9551048d42cef < 09e722030e8148ba4ed1e42c6b2ea57bda9f9895affected
LinuxLinux8f840e47f190cbe61a96945c13e9551048d42cef < 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0affected
LinuxLinux8f840e47f190cbe61a96945c13e9551048d42cef < 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75affected
LinuxLinux8f840e47f190cbe61a96945c13e9551048d42cef < bd0e9289e2642f6a5c54faad304ce0f41e926d22affected
LinuxLinux4.7affected
LinuxLinux0 < 4.7unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2-rc6 <= *unaffected

Weaknesses

References