CVE-2026-31531

A flaw was found in the Linux kernel. A local user can trigger a denial of service by querying a nexthop object with a large number of nexthop groups. This occurs because the kernel uses a fixed-size buffer that cannot accommodate the large response, leading to a kernel warning and potential system instability.

This Moderate flaw in the Linux kernel's IPv4 nexthop handling could allow a local attacker to cause a denial of service. By querying a nexthop object with an excessively large number of groups, the kernel's fixed-size buffer can be overflowed, leading to a kernel warning and potential system instability. While direct reproduction via standard tools like iproute2 is limited, a malicious local user could craft specific requests to trigger this condition.

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 for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.