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Vulnerability · Published Jan 19, 2025 · Assigned by Linux

CVE-2025-21648netfilter: conntrack: clamp maximum hashtable size to INT_MAX

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 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 87.5% 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: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. See: 0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls") Note: hashtable resize is only possible from init_netns.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.128-1DEBIAN-CVE-2025-21648
Debian:12linux6.1.128-1DSA-5860-1
Debian:13linux6.12.10-1DEBIAN-CVE-2025-21648
Debian:14linux6.12.10-1DEBIAN-CVE-2025-21648
Ubuntu:22.04:LTSlinux5.15.0-135.146UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux6.8.0-60.63UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-aws5.15.0-1080.87UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-aws6.8.0-1029.31UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1029.31~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure5.15.0-1084.93UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-azure6.8.0-1029.34UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1012.12~24.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1029.34~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1084.93.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1016.17UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gcp5.15.0-1079.88UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-gcp6.8.0-1030.32UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1011.11~24.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1030.32~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gke5.15.0-1077.83UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-gke6.8.0-1025.29UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1062.70UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1012.14UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-21.21~24.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-60.63~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-ibm5.15.0-1072.75UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-ibm6.8.0-1026.26UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1026.26~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-intel-iot-realtime5.15.0-1073.75UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1075.81UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-kvm5.15.0-1076.81UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-135.146UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-60.63.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-60.63.1~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1074.75UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1028.31UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1007.7UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1028.31~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1028.31.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1033.33UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1008.8UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1021.21UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1017.17UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1028.28UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oracle5.15.0-1077.83UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-oracle6.8.0-1026.27UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1026.27~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-raspi5.15.0-1074.77UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-raspi6.8.0-1028.32UBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-riscv6.8.0-60.63.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-62.65~22.04.1UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21648
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-21648
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1044.48UBUNTU-CVE-2025-21648

Affected products (as reported)

VendorProductVersions
Linux Linux 9cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before a965f7f0ea3ae61b9165bed619d5d6da02c75f809cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before b1b2353d768f1b80cd7fe045a70adee576b9b3389cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before 5552b4fd44be3393b930434a7845d8d95a2a3c339cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before d5807dd1328bbc86e059c5de80d1bbee9d58ca3d9cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before f559357d035877b9d0dcd273e0ff83e18e1d46aa9cc1c73ad66610bffc80b691136ffc1e9a3b1a58 – before b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13
Linux Linux 4.7

References