sctp: fix auth_hmacs array size in struct sctp_cookie
Priority LOW 38CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 10 fixed, 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00605 49th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.265, 5.15.216, 6.1.183 +5Red Hat: 4 advisoriesRed Hat: 10 fixed, 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.24 and later | 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.24 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
Red Hat 4 advisories
- RHSA-2026:95346 Released 2026-11-06 · Red Hat rating CriticalOpenShift Container Platform 4.22.22 bug fix and security update
- Red Hat OpenShift Container Platform 4.22 rhcos-aarch64-4.22.9.8.202611032353-0, rhcos-ppc64le-4.22.9.8.202611032353-0, rhcos-s390x-4.22.9.8.202611032353-0 +1
- RHSA-2026:67150 Released 2026-09-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.47.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.47.1.el9_8, kernel-64k-devel-5.14.0-687.47.1.el9_8 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.47.1.el9_8, kernel-64k-5.14.0-687.47.1.el9_8, kernel-64k-core-5.14.0-687.47.1.el9_8 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.47.1.el9_8, libperf-5.14.0-687.47.1.el9_8
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.47.1.el9_8, kernel-rt-64k-5.14.0-687.47.1.el9_8, kernel-rt-64k-core-5.14.0-687.47.1.el9_8 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.47.1.el9_8, kernel-rt-core-5.14.0-687.47.1.el9_8, kernel-rt-debug-5.14.0-687.47.1.el9_8 +9
- RHSA-2026:66325 Released 2026-09-10 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.162.1.el8_10, kernel-4.18.0-553.162.1.el8_10, kernel-abi-stablelists-4.18.0-553.162.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.162.1.el8_10
Show 1 more Red Hat advisories
- RHSA-2026:66324 Released 2026-09-10 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-core-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-debug-4.18.0-553.162.1.rt7.503.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-core-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-debug-4.18.0-553.162.1.rt7.503.el8_10 +7
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix yet |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:66325 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:66325 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:66324 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:66324 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:95346 |
Not affected: 1 product
- Red Hat Enterprise Linux for NVIDIA 26
Timeline
- 2026-10-02 Threatist record created from CVE-2026-68376
- 2026-10-03 Alias added: GHSA-55hr-9mvf-6m8f
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-20 Weakness changed · CISA ADP
- 2026-10-30 Affected versions changed · Red Hat
- 2026-11-07 Fix available: RHSA-2026:95346 · Red Hat
- 2026-11-07 Fix available: Red Hat OpenShift Container Platform 4.22 · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/317731d01b03c529809df36d3a7d149677a8729d
- https://git.kernel.org/stable/c/0528485f27016a42804abe01aa61b39d85fa803e
- https://git.kernel.org/stable/c/ee5e65964f456adfe14d526fba0bd055de98ecf3
- https://git.kernel.org/stable/c/0b4414e43e0861d67276031cc21401d7e87de3da
- https://git.kernel.org/stable/c/d0a59ba58578e2b330fff80a44fe519f3ba7d8c7
- https://git.kernel.org/stable/c/a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db
- https://git.kernel.org/stable/c/3aa40c3bccac2312ea7cf97f329190637f972b5d
- https://git.kernel.org/stable/c/e0b5252a59383b77d1b8dbeda00b7184dd95f4d3
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Sources
- CVE-2026-68376 · CVE Program
- CVE-2026-68376 · NVD
- FIRST EPSS
- GHSA-55hr-9mvf-6m8f · GitHub Advisory Database · CC BY 4.0
- CVE-2026-68376 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences