SB20261029152 - NULL pointer dereference in Linux kernel sctp

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-99165)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/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 the Linux kernel SCTP send path when processing an output stream after a wait that releases the socket lock. A remote attacker can negotiate a reduced stream count during association establishment while a send operation is waiting to cause the sender to reuse a stream whose extension has been freed, triggering a kernel fault.

The association-establishment wait scenario requires message interleaving to be enabled.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/77a63d1b813b08c4e5a948f5e04fbaca6176aa8f
• https://git.kernel.org/stable/c/b7ad72414c673ce1fa1f463e807cd4f34f8be9bf
• https://git.kernel.org/stable/c/fd56ac95ec31a05b66e8938debfa847f49c0e993