CVE-2026-68376
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
In the Linux kernel, the auth_hmacs array size in struct sctp_cookie is miscalculated, causing out-of-bounds copy during SCTP association initialization. This can corrupt the adjacent auth_chunks field, accept an invalid HMAC identifier, and lead to out-of-bounds read in sctp_auth_get_hmac().
Risk Assessment
The vulnerability may allow remote triggering of incorrect behavior in the SCTP stack, potentially leading to system crash or privilege escalation.
Recommendation
Update the Linux kernel to a patched version that includes the full SCTP parameter header size in the calculation.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_hmacs array size in struct sctp_cookie The auth_hmacs array in struct sctp_cookie is supposed to store a complete SCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr followed by N HMAC identifiers. However, the array size was calculated using an extra 2 bytes instead of sizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers are configured, the HMAC-ALGO parameter stored in the endpoint is larger than the auth_hmacs buffer in the cookie. As a result, sctp_association_init() copies beyond the end of auth_hmacs when initializing the association, corrupting the adjacent auth_chunks field. This can lead to an invalid HMAC identifier being accepted and later cause an out-of-bounds read in sctp_auth_get_hmac(). Fix the array size calculation by including the full SCTP parameter header size.