sctp: fix auth_hmacs array size in struct sctp_cookie
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.
CVE-2026-68376
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68376
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "317731d01b03c529809df36d3a7d149677a8729d",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "0528485f27016a42804abe01aa61b39d85fa803e",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "ee5e65964f456adfe14d526fba0bd055de98ecf3",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "0b4414e43e0861d67276031cc21401d7e87de3da",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "d0a59ba58578e2b330fff80a44fe519f3ba7d8c7",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "3aa40c3bccac2312ea7cf97f329190637f972b5d",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "e0b5252a59383b77d1b8dbeda00b7184dd95f4d3",
"versionType": "git"
}
],
"programFiles": [
"include/net/sctp/structs.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/sctp/structs.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68376
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41707 · Revision 1
- Added to Heist Feed
- Publisher date