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Vulnerability · Published May 27, 2026 · Assigned by Linux

CVE-2026-45897netfilter: nft_counter: serialize reset with spinlock

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 94.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.190-1DEBIAN-CVE-2026-45897
Debian:13linux6.12.101-1DEBIAN-CVE-2026-45897
Debian:14linux6.19.6-1DEBIAN-CVE-2026-45897
Debian:12linux-6.126.12.101-1~deb12u1DEBIAN-CVE-2026-45897
Ubuntu:24.04:LTSlinux6.8.0-147.147USN-8917-1
Ubuntu:24.04:LTSlinux6.8.0-147.147UBUNTU-CVE-2026-45897
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70USN-8917-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1067.70UBUNTU-CVE-2026-45897
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure6.8.0-1071.79USN-8918-1
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76USN-8918-1
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1069.76UBUNTU-CVE-2026-45897
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79USN-8917-1
Ubuntu:24.04:LTSlinux-gcp6.8.0-1071.79UBUNTU-CVE-2026-45897
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74USN-8917-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1066.74UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1052.56USN-8917-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-ibm6.8.0-1067.68USN-8917-1
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1USN-8917-1
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-147.147.1UBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oracle6.8.0-1064.67USN-8917-1
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-45897
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-45897
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-45897
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-45897
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-45897

Affected products (as reported)

VendorProductVersions
Linux Linux fb1adb05ea87b6149e65a31e511756c4f470d0cd – before e13194e60217db02c2e7202375d9e5951267d87bf123293db16dcd0cd81b246ae60e6362f0025d0a – before de6601f1374fab124cd9276df6671f64d940ceb43cb03edb4de33fd04c4ea55f47397b96a8657c53 – before 48cf7918d10c66cb6b05226fa3fa5daf0c8910893cb03edb4de33fd04c4ea55f47397b96a8657c53 – before cd968dcdec6aee79a2d399e4f6e0eca63c3b45e13cb03edb4de33fd04c4ea55f47397b96a8657c53 – before 0cdc6d5a26f2d1f7f15a43526841b679445c32e23cb03edb4de33fd04c4ea55f47397b96a8657c53 – before 779c60a5190c42689534172f4b49e927c9959e4e6.1.107 – before 6.1.1886.6.48 – before 6.6.157
Linux Linux 6.7

References