CVE-2025-37997: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: from 5.4.24, before 5.4.294 (fixed in 5.4.294); from 5.5.8, before 5.6 (fixed in 5.6); from 5.6.1, before 5.10.238 (fixed in 5.10.238); from 5.11, before 5.15.183 (fixed in 5.15.183); from 5.16, before 6.1.139 (fixed in 6.1.139); from 6.2, before 6.6.91 (fixed in 6.6.91); …

Published 2025-05-29. Last modified 2026-07-30.