CVE-2026-43114

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry

New test case fails unexpectedly when avx2 matching functions are used.

The test first loads a ranomly generated pipapo set

with 'ipv4 . port' key, i.e. nft -f foo.

This works. Then, it reloads the set after a flush:

(echo flush set t s; cat foo) | nft -f -

This is expected to work, because its the same set after all and it was

already loaded once.

But with avx2, this fails: nft reports a clashing element.

The reported clash is of following form:

We successfully re-inserted

a . b

c . d

Then we try to insert a . d

avx2 finds the already existing a . d, which (due to 'flush set') is marked

as invalid in the new generation. It skips the element and moves to next.

Due to incorrect masking, the skip-step finds the next matching

element *only considering the first field*,

i.e. we return the already reinserted "a . b", eve

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References