---
cve: "CVE-2026-63971"
severity: "HIGH"
cvss: 7.8
epss: "17%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-19 16:17:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T07:53:33+02:00"
---

# CVE-2026-63971

> 7.8 HIGH

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix race between sctp_wait_for_connect and peeloff

sctp_wait_for_connect() drops and re-acquires the socket lock while
waiting for the association to reach ESTABLISHED state. During this
window, another thread can peeloff the association to a new socket via
getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After
re-acquiring the old socket lock, sctp_wait_for_connect() returns
success without noticing the migration — the caller then accesses
the association under the wrong lock in sctp_datamsg_from_user().

Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf()
already has, returning an error if the association was migrated while
we slept.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.259
- Kernel ≥ 5.15.210
- Kernel ≥ 6.1.176
- Kernel ≥ 6.6.143
- Kernel ≥ 6.12.93
- Kernel ≥ 6.18.35
- Kernel ≥ 7.0.12

## Referenzen

- <https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d>
- <https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5>
- <https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549>
- <https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb>
- <https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21>
- <https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e>
- <https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb>
- <https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63971) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_