CVE-2026-74469 sctp: prevent peer transport count overflow
An integer overflow in the Linux kernel SCTP implementation allows remote attackers to cause memory corruption and potential code execution via crafted peer transport counts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74469?
CVE-2026-74469 is a high-severity vulnerability in Linux, published on 15 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sctp: prevent peer transport count overflow
sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero.
SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail.
Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.
Which versions are affected by CVE-2026-74469?
How do I fix CVE-2026-74469?
Apply the vendor's patch.
Is CVE-2026-74469 being exploited?
There is no known exploitation of CVE-2026-74469 in the wild and no public exploit code.
Public exploit code: 3 proofs of concept on GitHub.
Sources
Also known as AZL-96329, BELL-CVE-2026-74469, DEBIAN-CVE-2026-74469, GHSA-772m-42gr-vc4c, UBUNTU-CVE-2026-74469.