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Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-53075ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

High 8.8

In plain English

A high-severity incorrect authorization 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 0.3% (higher than 20% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 80.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

In the Linux kernel, the following vulnerability has been resolved: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file->f_cred->user_ns, while unattached administrative ioctls operate on current->nsproxy->net_ns. As a result, a local unprivileged user can create a new user namespace with CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace, and still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against an inherited network namespace. Require CAP_NET_ADMIN in the user namespace that owns the target network namespace before handling unattached PPP administrative ioctls. This preserves normal pppd operation in the network namespace it is actually privileged in, while rejecting the userns-only inherited-netns case.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-abi-stablelists4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-cross-headers4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-debug4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-debug-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-debug-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-debug-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-doc4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-headers4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-rt4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-core4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-debug4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-debug-core4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-devel4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-modules4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:8kernel-tools4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-tools-libs4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-zfcpdump4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8perf4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:8python3-perf4.18.0-553.164.1.el8_10ALSA-2026:68531
Debian:12linux6.1.176-1DEBIAN-CVE-2026-53075
Debian:13linux6.12.94-1DEBIAN-CVE-2026-53075
Debian:14linux7.0.10-1DEBIAN-CVE-2026-53075
Rocky Linux:10kernel0:6.12.0-211.52.1.el10_2RLSA-2026:64775
Rocky Linux:8kernel0:4.18.0-553.164.1.el8_10RLSA-2026:68531
Rocky Linux:8kernel-rt0:4.18.0-553.164.1.rt7.505.el8_10RLSA-2026:68532
Ubuntu:22.04:LTSlinux5.15.0-186.196UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux6.8.0-136.136UBUNTU-CVE-2026-53075
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-aws5.15.0-1112.119UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-aws6.8.0-1061.64UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1061.64~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure5.15.0-1117.126UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure6.8.0-1063.71UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1063.71~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1117.126UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1062.69UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1062.69~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gcp5.15.0-1112.122UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gcp6.8.0-1064.72UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1064.72~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gke5.15.0-1108.114UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gke6.8.0-1059.67UBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1095.103UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1046.50UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-136.136~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-ibm5.15.0-1106.110UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-ibm6.8.0-1061.62UBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1061.62~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1107.113UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-kvm5.15.0-1104.109UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-184.194UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-136.136.2UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-136.136.2~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1107.108UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1059.62UBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1059.62~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1059.62.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1064.66UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1030.31UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1053.53UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oracle5.15.0-1109.115UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oracle6.8.0-1058.61UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1058.61~22.04.1UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-raspi5.15.0-1106.109UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-raspi6.8.0-1061.65UBUNTU-CVE-2026-53075
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53075
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-53075
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-136.136~22.04.3UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-53075
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1033.34UBUNTU-CVE-2026-53075
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1075.79UBUNTU-CVE-2026-53075

Affected products (as reported)

VendorProductVersions
Linux Linux 273ec51dd7ceaa76e038875d85061ec856d8905e – before c9edd90c57ae23692fff6b049fdfa4572a9fd532273ec51dd7ceaa76e038875d85061ec856d8905e – before 5080e188c914110034bbc569d5cfa2f06204681d273ec51dd7ceaa76e038875d85061ec856d8905e – before 67e901e28d177ac9a9bed76d69ce3471e704a89e273ec51dd7ceaa76e038875d85061ec856d8905e – before 954745d0223e7caec917c0b2d1a889ff56fa6e54273ec51dd7ceaa76e038875d85061ec856d8905e – before 3b2c2157dc2afc5c17cd7238afefca92f1ef330e273ec51dd7ceaa76e038875d85061ec856d8905e – before 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8273ec51dd7ceaa76e038875d85061ec856d8905e – before 1a8a51ce85075a56a743b6f142606dd2696a391c273ec51dd7ceaa76e038875d85061ec856d8905e – before 2bb6379416fd19f44c3423a00bfd8626259f6067
Linux Linux 2.6.30

Weakness: CWE-863 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References