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Vulnerability · Published Sep 15, 2025 · Assigned by Linux

CVE-2023-53189ipv6/addrconf: fix a potential refcount underflow for idev

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 6% 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 93.8% 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/addrconf: fix a potential refcount underflow for idev Now in addrconf_mod_rs_timer(), reference idev depends on whether rs_timer is not pending. Then modify rs_timer timeout. There is a time gap in [1], during which if the pending rs_timer becomes not pending. It will miss to hold idev, but the rs_timer is activated. Thus rs_timer callback function addrconf_rs_timer() will be executed and put idev later without holding idev. A refcount underflow issue for idev can be caused by this. if (!timer_pending(&idev->rs_timer)) in6_dev_hold(idev); <--------------[1] mod_timer(&idev->rs_timer, jiffies + when); To fix the issue, hold idev if mod_timer() return 0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.52-1DEBIAN-CVE-2023-53189
Debian:13linux6.4.11-1DEBIAN-CVE-2023-53189
Debian:14linux6.4.11-1DEBIAN-CVE-2023-53189
Ubuntu:22.04:LTSlinux5.15.0-86.96UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-aws5.15.0-1047.52UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure5.15.0-1049.56UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1049.56.1UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gcp5.15.0-1044.52UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gke5.15.0-1044.49UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1030.35UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-ibm5.15.0-1040.43UBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1043.49UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-kvm5.15.0-1044.49UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-86.95UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1037.37UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1018.18UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1005.5UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oracle5.15.0-1045.51UBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-raspi5.15.0-1040.43UBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53189
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-53189
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-53189

Affected products (as reported)

VendorProductVersions
Linux Linux b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before c6395e32935d35e6f935e7caf1c2dac5a95943b4b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before df62fdcd004afa72ecbed0e862ebb983acd3aa57b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before c7eeba47058532f6077d6a658e38b6698f6ae71ab7b1bfce0bb68bd8f6e62a28295922785cc63781 – before 2ad31ce40e8182860b631e37209e93e543790b7cb7b1bfce0bb68bd8f6e62a28295922785cc63781 – before 82abd1c37d3bf2a2658b34772c17a25a6f9cca42b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before 436b7cc7eae7851c184b671ed7a4a64c750b86f7b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before 1f656e483eb4733d62f18dfb206a49b78f60f495b7b1bfce0bb68bd8f6e62a28295922785cc63781 – before 06a0716949c22e2aefb648526580671197151acc
Linux Linux 3.11

References