CVE-2026-98028
UnknownSummary
In the Linux kernel, the nfp ethernet driver fails to drop a replaced rule from the list when reprogramming fails. nfp_net_fs_add() deletes the old rule from hardware and decrements nn->fs.count, but if nfp_net_fs_add_hw() fails the old entry stays on nn->fs.list, so the list is one longer than the counter and still advertises a rule whose hardware entry was already torn down.
Risk Assessment
The counter mismatch causes userspace to size its buffer one entry short, resulting in a permanent -EMSGSIZE error and incorrect reporting of flow steering rules.
Recommendation
Update the Linux kernel to a version with the fix that removes the replaced rule from the list on the reprogramming failure path as well.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: eth: nfp: drop the replaced rule from the list when reprogramming fails nfp_net_fs_add() replaces an existing rule by deleting it from the hardware, decrementing nn->fs.count and programming the new one. If nfp_net_fs_add_hw() fails the old entry stays on nn->fs.list - only the success path reaches list_replace() - so the list is one longer than nn->fs.count, and it advertises a rule whose hardware entry has already been torn down. nn->fs.count is what ETHTOOL_GRXCLSRLCNT reports, so userspace then sizes its buffer one entry short of what the GRXCLSRLALL walk wants to write. That used to overwrite one u32 past the allocation; since the walk is bounded it is a permanent -EMSGSIZE instead, as nothing ever resyncs the counter.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS