Vulnerability · Published Sep 5, 2025 · Assigned by Linux

CVE-2025-39702ipv6: sr: Fix MAC comparison to be constant-time

Critical 9.8

In plain English

A critical-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 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 60.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:9kernel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-devel-matched5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-64k-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:10kernel-abi-stablelists6.12.0-55.42.1.el10_0ALSA-2025:19469
AlmaLinux:9kernel-abi-stablelists5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-cross-headers5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-devel-matched5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-debug-uki-virt5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-devel-matched5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:10kernel-doc6.12.0-55.42.1.el10_0ALSA-2025:19469
AlmaLinux:9kernel-doc5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-headers5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-kvm5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-kvm5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-rt-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-tools5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-tools-libs5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-tools-libs-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-uki-virt5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-uki-virt-addons5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-devel5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-modules5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9libperf5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9perf5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9python3-perf5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9rtla5.14.0-570.60.1.el9_6ALSA-2025:19409
AlmaLinux:9rv5.14.0-570.60.1.el9_6ALSA-2025:19409
Debian:12linux6.1.153-1DEBIAN-CVE-2025-39702
Debian:13linux6.12.48-1DEBIAN-CVE-2025-39702
Debian:13linux6.12.48-1DSA-6008-1
Debian:14linux6.16.5-1DEBIAN-CVE-2025-39702
Ubuntu:22.04:LTSlinux5.15.0-163.173UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux6.8.0-100.100UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-aws5.15.0-1097.104UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-aws6.8.0-1046.49UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure5.15.0-1101.110UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure6.8.0-1046.52UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1102.111.1UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1046.53UBUNTU-CVE-2025-39702
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1046.53~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gcp5.15.0-1097.106UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-gcp6.8.0-1047.50UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1047.50~22.04.2UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gke5.15.0-1093.99UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-gke6.8.0-1043.48UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1080.88UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1030.33UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-ibm5.15.0-1091.94UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-ibm6.8.0-1044.44UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1044.44~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1092.98UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-kvm5.15.0-1089.94UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-163.173UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-100.100.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-100.100.1~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1092.93UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1046.49UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1046.49.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1049.49UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1038.38UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oracle5.15.0-1094.100UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-oracle6.8.0-1043.44UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1043.44~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-raspi5.15.0-1091.94UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-raspi6.8.0-1047.51UBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-39702
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1023.24UBUNTU-CVE-2025-39702
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1061.65UBUNTU-CVE-2025-39702

Affected products (as reported)

VendorProductVersions
Linux Linux bf355b8d2c30a289232042cacc1cfaea4923936c – before ff55a452d56490047f5233cc48c5d933f8586884bf355b8d2c30a289232042cacc1cfaea4923936c – before 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0bf355b8d2c30a289232042cacc1cfaea4923936c – before 86b6d34717fe0570afce07ee79b8eeb40341f831bf355b8d2c30a289232042cacc1cfaea4923936c – before 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3bf355b8d2c30a289232042cacc1cfaea4923936c – before b3967c493799e63f648e9c7b6cb063aa2aed04e7bf355b8d2c30a289232042cacc1cfaea4923936c – before f7878d47560d61e3f370aca3cebb8f42a55b990abf355b8d2c30a289232042cacc1cfaea4923936c – before a458b2902115b26a25d67393b12ddd57d1216aaa
Linux Linux 4.10

References