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CVE-2026-99042

kernel: io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6

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Severity

Moderate

Red Hat Product Security

4.4

CVSS 3.1

Review impact separately from score.

Published · October 23, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's io_uring subsystem. When evaluating IPv6 network connections, security filters are supplied with zeroed address and port values if a caller provides a valid 24-byte address structure instead of the full 28-byte structure. A local attacker can exploit this flaw by submitting connection requests with shorter address lengths to bypass Berkeley Packet Filter (BPF) network security rules and connect to restricted destinations.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.4
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE-807 · Reliance on Untrusted Inputs in a Security Decision