CVE-2025-38120: netfilter: nf_set_pipapo_avx2: fix initial map fill
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nfsetpipapoavx2: 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 nftconcatrange.sh.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Apply the kernel netfilter followup fix for nf_set_pipapo_avx2: fix initial map fill so that if the first field doesn't cover the entire start map, the out-of-range remainder is zeroed to prevent leaking bits into the next match round map.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-38120?
CVE-2025-38120 has been assigned a high severity rating due to potential information leakage from the Linux kernel's netfilter.
How do I fix CVE-2025-38120?
To fix CVE-2025-38120, update your Linux kernel to the latest stable version that includes the patch addressing this vulnerability.
What systems are affected by CVE-2025-38120?
CVE-2025-38120 affects systems running the Linux kernel, particularly those utilizing the netfilter module.
What type of vulnerability is CVE-2025-38120?
CVE-2025-38120 is characterized as a kernel information leakage vulnerability.
Is there a workaround for CVE-2025-38120?
Currently, the recommended resolution for CVE-2025-38120 is to apply the kernel patch rather than relying on a workaround.