sctp: fix auth_hmacs array size in struct sctp_cookie

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68376
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:30 UTC
Updated2026-08-19 17:20:46 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.004220000 probability, percentile 0.354480000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 317731d01b03c529809df36d3a7d149677a8729d git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 0528485f27016a42804abe01aa61b39d85fa803e git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 ee5e65964f456adfe14d526fba0bd055de98ecf3 git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 0b4414e43e0861d67276031cc21401d7e87de3da git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 d0a59ba58578e2b330fff80a44fe519f3ba7d8c7 git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 3aa40c3bccac2312ea7cf97f329190637f972b5d git Not specified
CNA Linux Linux affected 1f485649f52929d9937b346a920a522a7363e202 e0b5252a59383b77d1b8dbeda00b7184dd95f4d3 git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0b4414e43e0861d67276031cc21401d7e87de3da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3aa40c3bccac2312ea7cf97f329190637f972b5d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0a59ba58578e2b330fff80a44fe519f3ba7d8c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/317731d01b03c529809df36d3a7d149677a8729d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0528485f27016a42804abe01aa61b39d85fa803e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee5e65964f456adfe14d526fba0bd055de98ecf3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0b5252a59383b77d1b8dbeda00b7184dd95f4d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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