CVE-2026-45897: Linux Kernel

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: nft_counter: serialize reset with spinlock Add a global static spinlock to serialize counter fetch+reset operations, preventing concurrent dump-and-reset from underrunning values. The lock is taken before fetching the total so that two parallel resets cannot both read the same counter values and then both subtract them. A global lock is used for simplicity since resets are infrequent. If this becomes a bottleneck, it can be replaced with a per-net lock later.

Affected products

• Linux Linux Kernel: from 6.1.107, before 6.2 (fixed in 6.2); from 6.6.48, before 6.19.4 (fixed in 6.19.4)

Published 2026-05-27. Last modified 2026-09-14.