CVE-2026-68300

Summary

In the Linux kernel, the following vulnerability has been resolved:

sctp: auth: verify auth requirement when auth_chunk is NULL

sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when:

  1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this.

  2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL.

Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbbd0d59809f923ea2b540cbd781b32110e249f6e < ec2e157fc9678a9bc411305a25aec3fd337d7efbaffected
LinuxLinuxbbd0d59809f923ea2b540cbd781b32110e249f6e < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646affected
LinuxLinuxbbd0d59809f923ea2b540cbd781b32110e249f6e < 18957373920caf5cdaf5cf32e5d1d7a99ca7700aaffected
LinuxLinuxbbd0d59809f923ea2b540cbd781b32110e249f6e < 83f5031f2a6a49d696eb4cc0898345d12f9c6451affected
LinuxLinuxbbd0d59809f923ea2b540cbd781b32110e249f6e < 8e04823c120b376ef7dab14b60ebf6823aa16c14affected
LinuxLinux2.6.24affected
LinuxLinux0 < 2.6.24unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References