CVE-2026-72252
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the nft_set_pipapo netfilter module has a vulnerability that leaks a bad clone into a future transaction. Memory allocation failure can lead to out-of-bounds writes during subsequent operations.
Risk Assessment
Memory allocation failure can lead to out-of-bounds writes, potentially causing a system crash or privilege escalation.
Recommendation
Apply a Linux kernel update containing the fix that introduces states for the nft_pipapo_match structure and prevents the use of corrupted clones.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: don't leak bad clone into future transaction On memory allocation failure the cloned nft_pipapo_match can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsize_max can be lower than what is required This means that the next insertion in the same batch can trigger out-of-bounds writes. Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made). Record a state for the nft_pipapo_match structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content) Then make it so that deletes and insertions fail when the clone entered ERR state. In case the very first insert attempt results in an error, free the clone right away.