Log in Start free

Vulnerability · Published Aug 26, 2026 · Assigned by Linux

CVE-2026-80586mptcp: options: reset DSS fields in case of unexpected size

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 34% 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 65.7% 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: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. Explicitly reset the fields that could have been modified in case of unexpected size.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-abi-stablelists4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-core4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-cross-headers4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-debug4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-debug-core4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-debug-devel4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-debug-modules4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-devel4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-doc4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-headers4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-modules4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-modules-extra4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-rt4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-core4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-debug4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-debug-core4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-devel4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-modules4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.178.1.rt7.519.el8_10ALSA-2026:89082
AlmaLinux:8kernel-tools4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-tools-libs4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-zfcpdump4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8perf4.18.0-553.178.1.el8_10ALSA-2026:89083
AlmaLinux:8python3-perf4.18.0-553.178.1.el8_10ALSA-2026:89083
Debian:12linux6.1.187-1DEBIAN-CVE-2026-80586
Debian:13linux6.12.105-1DEBIAN-CVE-2026-80586
Debian:14linux7.1.10-1DEBIAN-CVE-2026-80586
Debian:12linux-6.126.12.107-1~deb12u1DEBIAN-CVE-2026-80586
Rocky Linux:10kernel0:6.12.0-211.72.1.el10_2RLSA-2026:93413
Rocky Linux:8kernel0:4.18.0-553.178.1.el8_10RLSA-2026:89083
Rocky Linux:9kernel0:5.14.0-687.64.1.el9_8RLSA-2026:93412
Rocky Linux:8kernel-rt0:4.18.0-553.178.1.rt7.519.el8_10RLSA-2026:89082
Ubuntu:22.04:LTSlinux5.15.0-202.212UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-aws5.15.0-1119.126UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure5.15.0-1125.134UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1124.133UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gcp5.15.0-1120.130UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-gcp7.0.0-1016.18UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gke5.15.0-1115.121UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1102.110UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-42.42~24.04.1UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-ibm5.15.0-1113.117UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-ibm7.0.0-1017.17UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1114.120UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-kvm5.15.0-1111.116UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-197.207UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1114.115UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1070.72UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1036.39UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1059.59UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1017.17UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oracle5.15.0-1116.122UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-oracle7.0.0-1015.16UBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-80586
Ubuntu:26.04:LTSlinux-riscv7.0.0-42.42.1UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-42.42.1~24.04.1UBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-80586
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-80586
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-80586

Affected products (as reported)

VendorProductVersions
Linux Linux 648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before b1256090816ec46011601e084be580731df58fc7648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 192878df582c51d440bf7b91a15f297f29f2b596648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 26dac5c9ffb20812b475fdf253eb04fab99cff3b648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 4e80eff5c1c893aca2ac1d202f0b256d2e52ecde648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 1fade1b2ac5b1a4948e538fae7313bea57b5ac36648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 27ed642a4e7e4b5df4b8522c72c457a67e052493648ef4b88673dadb8463bf0d4b10fbf33d55def8 – before 35772b4981f38ba8059372cde8753e8e477e98ec
Linux Linux 5.6

References