CVE-2026-80717 sctp: validate Adaptation Indication parameter length
A remote attacker can disclose four bytes of kernel memory by sending a malformed SCTP INIT packet with a truncated Adaptation Indication parameter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80717?
CVE-2026-80717 is a high-severity vulnerability in Linux, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sctp: validate Adaptation Indication parameter length
The Adaptation Layer Indication parameter contains a fixed 32-bit Adaptation Code Point after its parameter header. However, sctp_verify_param() accepts a header-only parameter because the generic parameter walker only requires the header to be present.
sctp_process_param() then reads adaptation_ind beyond the declared parameter. When the malformed parameter is last in an INIT, the read starts at the receive skb tail, and the value is copied into the state cookie returned in the INIT ACK. This may disclose four receive-buffer tail bytes.
Require the declared parameter length to match the fixed structure size and abort the association through the existing invalid parameter length path otherwise.
Which versions are affected by CVE-2026-80717?
How do I fix CVE-2026-80717?
Apply the vendor's patch.
Is CVE-2026-80717 being exploited?
There is no known exploitation of CVE-2026-80717 in the wild and no public exploit code.
Sources
Also known as AZL-98190, BELL-CVE-2026-80717, DEBIAN-CVE-2026-80717, GHSA-fq3m-cvqw-wrvh, UBUNTU-CVE-2026-80717.