SB20260816164 - Improper resource shutdown or release in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-74550)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

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 improper resource shutdown in ICMP/NDISC redirect handling when peer allocation fails under memory pressure or peer tree size caps. A remote attacker can trigger packet forwarding conditions that cause un-rate-limited ICMP/NDISC Redirect messages to be sent to cause a denial of service.

The issue affects both IPv4 and IPv6 redirect paths.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/21666f7af49a90ef44d474916b8ef4402dfd74f5
• https://git.kernel.org/stable/c/5ec5f00fc606a6df8434948c4552b3cb1176595d
• https://git.kernel.org/stable/c/828f6670d110ff2bf44c743037b38badc315704c
• https://git.kernel.org/stable/c/dbc3791e3b2472e1ccc08947e0f83b443470ff4f
• https://git.kernel.org/stable/c/f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1