CVE-2025-37997 netfilter: ipset: fix region locking in hash types

What is CVE-2025-37997?

CVE-2025-37997 is a high-severity vulnerability in Debian Debian Linux, published on 29 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

netfilter: ipset: fix region locking in hash types

Region locking introduced in v5.6-rc4 contained three macros to handle the region locks: ahash_bucket_start(), ahash_bucket_end() which gave back the start and end hash bucket values belonging to a given region lock and ahash_region() which should give back the region lock belonging to a given hash bucket. The latter was incorrect which can lead to a race condition between the garbage collector and adding new elements when a hash type of set is defined with timeouts.

Weakness: CWE-667

Which versions are affected by CVE-2025-37997?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-37997?

Apply the vendor's patch.

Is CVE-2025-37997 being exploited?

There is no known exploitation of CVE-2025-37997 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-37997, DEBIAN-CVE-2025-37997, GHSA-jgxp-fpw7-p364, ROOT-OS-DEBIAN-11-CVE-2025-37997, ROOT-OS-DEBIAN-12-CVE-2025-37997, ROOT-OS-UBUNTU-2204-CVE-2025-37997 and 1 more.