Log in Start free

Vulnerability · Published Jul 4, 2025 · Assigned by Linux

CVE-2025-38177sch_hfsc: make hfsc_qlen_notify() idempotent

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 11% 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 88.5% 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: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.139-1DEBIAN-CVE-2025-38177
Debian:13linux6.12.29-1DEBIAN-CVE-2025-38177
Debian:14linux6.12.29-1DEBIAN-CVE-2025-38177
Ubuntu:22.04:LTSlinux5.15.0-143.153UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux6.8.0-63.66UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-aws5.15.0-1087.94UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-aws6.8.0-1031.33UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1031.33~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure5.15.0-1092.101UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-azure6.8.0-1031.36UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1031.36~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1092.101.1UBUNTU-CVE-2025-38177
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1019.20UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gcp5.15.0-1086.95UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-gcp6.8.0-1032.34UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1011.11~24.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1032.34~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gke5.15.0-1084.90UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-gke6.8.0-1027.31UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1069.77UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1014.16UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-64.67~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-ibm5.15.0-1079.82UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-ibm6.8.0-1028.28UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1028.28~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1082.88UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-kvm5.15.0-1083.88UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-143.153UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-63.66.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-63.66.1~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1081.82UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1030.33UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1012.12UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1030.33~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1030.33.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1040.40UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1008.8UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1029.29UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1025.25UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1006.6UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1030.30UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oracle5.15.0-1084.90UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-oracle6.8.0-1028.29UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1028.29~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-raspi5.15.0-1083.86UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-raspi6.8.0-1030.34UBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-riscv-6.146.14.0-23.23.1~24.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-63.66~22.04.1UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-38177
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1017.18UBUNTU-CVE-2025-38177
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1051.55UBUNTU-CVE-2025-38177

Affected products (as reported)

VendorProductVersions
Linux Linux 959466588aa7f84ccf79ae36a1d89542eaf9aaec – before 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956959466588aa7f84ccf79ae36a1d89542eaf9aaec – before 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7959466588aa7f84ccf79ae36a1d89542eaf9aaec – before a5efc95a33bd4fcb879250852828cc58c7862970959466588aa7f84ccf79ae36a1d89542eaf9aaec – before 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87959466588aa7f84ccf79ae36a1d89542eaf9aaec – before 9030a91235ae4845ec71902c3e0cecfc9ed1f2df959466588aa7f84ccf79ae36a1d89542eaf9aaec – before d06476714d2819b550e0cc39222347e2c8941c9d959466588aa7f84ccf79ae36a1d89542eaf9aaec – before c1175c4ad01dbc9c979d099861fa90a754f72059959466588aa7f84ccf79ae36a1d89542eaf9aaec – before 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
Linux Linux 4.14

References