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_veri...

Description

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

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= bbd0d59809f923ea2b540cbd781b32110e249f6e, < ec2e157fc9678a9bc411305a25aec3fd337d7efb; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 18957373920caf5cdaf5cf32e5d1d7a99ca7700a; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 83f5031f2a6a49d696eb4cc0898345d12f9c6451; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 8e04823c120b376ef7dab14b60ebf6823aa16c14
Linux	Linux	2.6.24

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 10, 2026
Status: Received

Frequently Asked Questions

What is 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 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.

How severe is CVE-2026-68300?

Severity scoring for CVE-2026-68300 is pending analysis.

How do I fix CVE-2026-68300?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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