CVE-2026-68320 sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
A buffer overflow in the Linux kernel SCTP implementation allows attackers to corrupt memory, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68320?
CVE-2026-68320 is a high-severity memory corruption vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes.
Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.
Weakness: CWE-787
Which versions are affected by CVE-2026-68320?
How do I fix CVE-2026-68320?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68320 being exploited?
There is no known exploitation of CVE-2026-68320 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68320, DEBIAN-CVE-2026-68320, GHSA-f7gm-j66v-p95w, UBUNTU-CVE-2026-68320.