---
cve: "CVE-2026-68376"
severity: "HIGH"
cvss: 8.1
epss: "48%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-10 13:20:30"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T02:31:10+02:00"
---

# CVE-2026-68376

> 8.1 HIGH

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.265
- Kernel ≥ 5.15.216
- Kernel ≥ 6.1.183
- Kernel ≥ 6.6.148
- Kernel ≥ 6.12.101
- Kernel ≥ 6.18.42
- Kernel ≥ 7.1.6

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-68376) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_