CVE-2026-98028 eth: nfp: drop the replaced rule from the list when reprogramming fails
A logic error in the Linux kernel NFP driver causes a buffer overflow when reprogramming fails, allowing local attackers to cause denial of service or read memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98028?
CVE-2026-98028 is a memory corruption vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-98028?
How do I fix CVE-2026-98028?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-98028 being exploited?
There is no known exploitation of CVE-2026-98028 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98028, DEBIAN-CVE-2026-98028, GHSA-9537-hf5q-v67h, UBUNTU-CVE-2026-98028.