SB20260727149 - Improper handling of exceptional conditions in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Improper handling of exceptional conditions (CVE-ID: CVE-2026-64414)

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

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 handling of unreadable fragments in netfilter packet processing when processing packets with unreadable fragments. A remote attacker can send a specially crafted packet to cause a denial of service.

The issue affects the xt_u32 matcher, nfnetlink_queue, nfnetlink_log, and IPv6 fragment header handling in connection tracking reassembly.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b
• https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c
• https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e
• https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354