SB20260912305 - NULL pointer dereference in Linux kernel sctp

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-89477)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a null pointer dereference in SCTP stream reconfiguration request handling when processing specially crafted SCTP RECONF chunks. A remote attacker can send a specially crafted SCTP RECONF packet to cause a denial of service.

A RECONF chunk containing incoming SSN reset, outgoing SSN reset, and response parameters, or two RECONF chunks in one packet, can trigger the issue.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318
• https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66
• https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec
• https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af