SB2026092871 - Infinite loop in Linux kernel sctp

Description

This security bulletin contains information about 1 vulnerability.

1) Infinite loop (CVE-ID: CVE-2026-98123)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper parameter iteration in sctp_get_asconf_response() when processing a crafted ASCONF-ACK. A remote user can send an ASCONF-ACK containing an odd-length parameter that causes the parameter-processing loop to make no progress and spin in softirq context to cause a denial of service.

The association must have ADD-IP enabled and an outstanding ASCONF request.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2cb0b0b1ed69430bf73740377ea0a1c44c50db63
• https://git.kernel.org/stable/c/3be02999ab9131a4b96eb1eda4ca48b1cea80f03
• https://git.kernel.org/stable/c/7ba84e2971d208a2d6413a334ec28a8a32cdce0f
• https://git.kernel.org/stable/c/abf59d7f6fff23227256e8199aca5ade45758f8b