CVE-2026-68300 | 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 c
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.
- 🔗 git.kernel.org/stable/c/a129792b3aef15002746c13522781d92…
- 🔗 git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65…
- 🔗 git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3…
- 🔗 git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd…
- 🔗 git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d…
- 🔗 git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a9…
- 🔗 git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d1…
- 🔗 git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf682…
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CVE-2026-68300 | 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 c
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 authen