CVE-2026-68376

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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0528485f27016a42804abe01aa61b39d85fa803e
https://git.kernel.org/stable/c/0b4414e43e0861d67276031cc21401d7e87de3da
https://git.kernel.org/stable/c/317731d01b03c529809df36d3a7d149677a8729d
https://git.kernel.org/stable/c/3aa40c3bccac2312ea7cf97f329190637f972b5d
https://git.kernel.org/stable/c/a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db
https://git.kernel.org/stable/c/d0a59ba58578e2b330fff80a44fe519f3ba7d8c7
https://git.kernel.org/stable/c/e0b5252a59383b77d1b8dbeda00b7184dd95f4d3
https://git.kernel.org/stable/c/ee5e65964f456adfe14d526fba0bd055de98ecf3

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-19 17:20

NVD link : CVE-2026-68376

Mitre link : CVE-2026-68376

CVE.ORG link : CVE-2026-68376

JSON object : View

Products Affected

No product.

CWE

No CWE.

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When four HMAC identifiers\nare configured, the HMAC-ALGO parameter stored in the endpoint is larger\nthan the auth_hmacs buffer in the cookie.\n\nAs a result, sctp_association_init() copies beyond the end of auth_hmacs\nwhen initializing the association, corrupting the adjacent auth_chunks\nfield. This can lead to an invalid HMAC identifier being accepted and later\ncause an out-of-bounds read in sctp_auth_get_hmac().\n\nFix the array size calculation by including the full SCTP parameter header\nsize."}], "lastModified": "2026-08-19T17:20:46.923", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}