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CVE-2024-14040 is a Linux kernel networking vulnerability in nexthop group weight handling. The nexthop group UAPI represented member weights with an 8-bit field, which was insufficient for large CLOS and ECMP deployments that require weight ratios exceeding 255. As a result, intended higher-precision weight values could not be represented correctly through the nexthop configuration interface. The fix expands internal nexthop weight handling from 8-bit to 16-bit and repurposes a previously reserved UAPI field to carry the high-order bits of the weight, with compatibility logic for older userspace and kernels. The issue is fundamentally an integer width limitation that could lead to truncation or inability to express valid operational values, affecting correctness of routing weight configuration rather than introducing a memory safety condition.
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Cross-references every affected SKU, including bundled OEM variants.
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