CVE-2026-74469
sctp: prevent peer transport count overflow
- Published
- Aug 15, 2026
- Updated
- Aug 19, 2026
- Assigning CNA
- Linux
- Evidence observed
- Sep 18, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 39.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
4Research repository for CVE-2026-74469 (DiagSpill), a Linux kernel SCTP peer transport counter overflow causing an out-of-bounds write, with PoC, root-cause analysis, and patch details.
- DiagSpillPoC
Local privilege escalation PoC for CVE-2026-74469, exploiting an SCTP diagnostic-reply kernel memory corruption to gain root on Linux x86-64 systems.
Responsible use
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