CVE-2025-38120 netfilter: nf_set_pipapo_avx2: fix initial map fill
A flaw in the Linux kernel netfilter AVX2 implementation leaks memory bits into subsequent match rounds, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38120?
CVE-2025-38120 is a critical vulnerability in Debian Debian Linux, published on 3 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_set_pipapo_avx2: fix initial map fill
If the first field doesn't cover the entire start map, then we must zero out the remainder, else we leak those bits into the next match round map.
The early fix was incomplete and did only fix up the generic C implementation.
A followup patch adds a test case to nft_concat_range.sh.
Which versions are affected by CVE-2025-38120?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-38120?
Apply the vendor's patch.
Is CVE-2025-38120 being exploited?
There is no known exploitation of CVE-2025-38120 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-38120, DEBIAN-CVE-2025-38120, GHSA-fpvw-x46c-p2qx, ROOT-OS-DEBIAN-12-CVE-2025-38120, ROOT-OS-UBUNTU-2204-CVE-2025-38120, ROOT-OS-UBUNTU-2404-CVE-2025-38120 and 1 more.