CVE-2026-43114

취약점 유형

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", even though the last field is different and the entry should not have been matched. No such error is reported for the generic c implementation (no avx2) or when the last field has to use the 'nft_pipapo_avx2_lookup_slow' fallback. Bis

영향받는 제품

• linux linux_kernel

참고 자료

• https://git.kernel.org/stable/c/07de44424bb7f17ef9357e8535df96d9e97c40cb
• https://git.kernel.org/stable/c/0abbc43f71d99baadeeba6fa3fe1c80b676f57ed
• https://git.kernel.org/stable/c/1c43f0dd8691ddf8884793b481ddc7511cf593c3
• https://git.kernel.org/stable/c/3d53f9aafd469ae1ea27051e00f5b96ca1b55d52
• https://git.kernel.org/stable/c/c7babe2f28b507e17f28e9f753b7caec72d4857f
• https://git.kernel.org/stable/c/d3c0037ffe1273fa1961e779ff6906234d6cf53c