Log in Start free

Vulnerability · Published Apr 1, 2025 · Assigned by Linux

CVE-2025-21971net_sched: Prevent creation of classes with TC_H_ROOT

High 7.8

In plain English

A high-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 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 86.4% 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: net_sched: Prevent creation of classes with TC_H_ROOT The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination condition when traversing up the qdisc tree to update parent backlog counters. However, if a class is created with classid TC_H_ROOT, the traversal terminates prematurely at this class instead of reaching the actual root qdisc, causing parent statistics to be incorrectly maintained. In case of DRR, this could lead to a crash as reported by Mingi Cho. Prevent the creation of any Qdisc class with classid TC_H_ROOT (0xFFFFFFFF) across all qdisc types, as suggested by Jamal.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.133-1DEBIAN-CVE-2025-21971
Debian:13linux6.12.20-1DEBIAN-CVE-2025-21971
Debian:14linux6.12.20-1DEBIAN-CVE-2025-21971
Ubuntu:22.04:LTSlinux5.15.0-140.150UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux6.8.0-60.63UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-aws5.15.0-1084.91UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-aws6.8.0-1029.31UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1029.31~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure5.15.0-1089.98UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-azure6.8.0-1029.34UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1015.15~24.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1029.34~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1089.98.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1016.17UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gcp5.15.0-1083.92UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-gcp6.8.0-1030.32UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1015.15~24.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1030.32~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gke5.15.0-1081.87UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-gke6.8.0-1025.29UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1066.74UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1012.14UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-26.26~24.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-60.63~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-ibm5.15.0-1076.79UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-ibm6.8.0-1026.26UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1026.26~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1079.85UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-kvm5.15.0-1080.85UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-140.150UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-60.63.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1014.15~24.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-60.63.1~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1078.79UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1028.31UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1010.10UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1028.31~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1028.31.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1037.37UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1008.8UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1026.26UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1022.22UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1028.28UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oracle5.15.0-1081.87UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-oracle6.8.0-1026.27UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1026.27~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-raspi5.15.0-1078.81UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-raspi6.8.0-1028.32UBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-riscv6.8.0-60.63.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-62.65~22.04.1UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21971
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-21971
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1050.54UBUNTU-CVE-2025-21971

Affected products (as reported)

VendorProductVersions
Linux Linux 066a3b5b2346febf9a655b444567b7138e3bb939 – before e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c066a3b5b2346febf9a655b444567b7138e3bb939 – before 7a82fe67a9f4d7123d8e5ba8f0f0806c28695006066a3b5b2346febf9a655b444567b7138e3bb939 – before 003d92c91cdb5a64b25a9a74cb8543aac9a8bb48066a3b5b2346febf9a655b444567b7138e3bb939 – before e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7066a3b5b2346febf9a655b444567b7138e3bb939 – before 78533c4a29ac3aeddce4b481770beaaa4f3bfb67066a3b5b2346febf9a655b444567b7138e3bb939 – before 5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7066a3b5b2346febf9a655b444567b7138e3bb939 – before 94edfdfb9505ab608e86599d1d1e38c83816fc1c066a3b5b2346febf9a655b444567b7138e3bb939 – before 0c3057a5a04d07120b3d0ec9c79568fceb9c921e
Linux Linux 2.6.25

References