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PatchSiren cyber security CVE debrief

CVE-2024-14040 Linux CVE debrief

A Linux kernel vulnerability, CVE-2024-14040, was resolved by increasing the next hop weight from u8 to u16. This change addresses issues with ECMP weights in CLOS networks, allowing for higher weight ratios. The update was done in two steps to ensure type correctness and prevent numerical errors. The UAPI for configuring nexthop group members was also adjusted to accommodate the new weight field. Old userspace is guaranteed to carry weight_high of 0, and new userspace talking to an old kernel will work as long as it only attempts to configure 8-bit weights.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-26
Original CVE updated
2026-07-26
Advisory published
2026-07-26
Advisory updated
2026-07-26

Who should care

System administrators and security teams managing Linux kernel-based systems, especially those using CLOS networks, should be aware of this vulnerability and the subsequent fix. They should review system configurations to ensure they are updated to accommodate the new weight field and monitor system logs for any issues related to nexthop group members.

Technical summary

The Linux kernel vulnerability CVE-2024-14040 was resolved by increasing the next hop weight from u8 to u16. This change allows for higher weight ratios in CLOS networks, addressing issues with ECMP weights. The update was done in two steps to ensure type correctness and prevent numerical errors. The UAPI for configuring nexthop group members was also adjusted to accommodate the new weight field. System administrators and security teams should review configurations to ensure updates for the new weight field and monitor logs for nexthop group member issues. The CVE record was published on 2026-07-26T07:16:39.583Z and has not been modified since then. Further verification is needed to determine affected scope and severity.

Defensive priority

Medium

Recommended defensive actions

  • Review and apply the kernel patch to ensure the vulnerability is fixed
  • Verify that system configurations are updated to accommodate the new weight field
  • Monitor system logs for any issues related to nexthop group members
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-26T07:16:39.583Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and further verification is needed to determine the affected scope and severity.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-26T07:16:39.583Z and has not been modified since then.