High · 7.5 CVE-2025-68246 EUVD-2025-203650GHSA-782g-7r6x-6926

ksmbd: close accepted socket when per-IP limit rejects connection

Published Dec 16, 2025 · Updated Aug 5, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: close accepted socket when per-IP limit rejects connection

When the per-IP connection limit is exceeded in ksmbd_kthread_fn(),
the code sets ret = -EAGAIN and continues the accept loop without
closing the just-accepted socket. That leaks one socket per rejected
attempt from a single IP and enables a trivial remote DoS.

Release client_sk before continuing.

This bug was found with ZeroPath.

Affected products

Vendor	Product	Affected	Fixed
Linux	Linux	5.15	6.1.159

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	linux	6.17.9-1	—
Debian 13	linux	6.12.63-1	—
Debian 12	linux	6.1.159-1	—
Debian 11	linux-6.1	6.1.159-1~deb11u1	DLA-4436-1

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu Nvidia-BlueField 24.04 LTS	linux-bluefield	6.8.0-1017.21	—
Ubuntu Nvidia-BlueField 22.04 LTS	linux-bluefield	No fix yet	—
Ubuntu 25.10	linux	6.17.0-14.14	USN-8029-1
Ubuntu 25.10	linux-aws +2	6.17.0-1007.7	USN-8030-1, USN-8029-2
Ubuntu 25.10	linux-azure +1	6.17.0-1008.8	USN-8029-3, USN-8029-1
Ubuntu 25.10	linux-azure-fde	No fix yet	—
Ubuntu 25.10	linux-realtime	6.17.0-1006.7	USN-8029-1
Ubuntu 25.10	linux-riscv	6.17.0-14.14.1	—
Ubuntu 24.04 LTS	linux	6.8.0-106.106	USN-8095-1
Ubuntu 24.04 LTS	linux-aws	6.8.0-1050.53	USN-8095-1
Ubuntu 24.04 LTS	linux-aws-6.17 +1	6.17.0-1007.7~24.04.1	—
Ubuntu 24.04 LTS	linux-azure	6.8.0-1051.57	USN-8125-1
Ubuntu 24.04 LTS	linux-azure-fde	6.8.0-1058.65	—
Ubuntu 24.04 LTS	linux-azure-nvidia	6.8.0-1039.42	—
Ubuntu 24.04 LTS	linux-gcp	6.8.0-1052.55	USN-8095-1
Ubuntu 24.04 LTS	linux-gcp-6.17	6.17.0-1008.8~24.04.1	—
Ubuntu 24.04 LTS	linux-gke	6.8.0-1048.53	USN-8095-1
Ubuntu 24.04 LTS	linux-gkeop	6.8.0-1035.38	USN-8095-1
Ubuntu 24.04 LTS	linux-ibm	6.8.0-1049.49	USN-8095-1
Ubuntu 24.04 LTS	linux-lowlatency	6.8.0-106.106.1	USN-8095-1
Ubuntu 24.04 LTS	linux-nvidia	6.8.0-1049.52	USN-8100-1
Ubuntu 24.04 LTS	linux-nvidia-6.17	6.17.0-1008.8	—
Ubuntu 24.04 LTS	linux-nvidia-lowlatency	6.8.0-1049.52.1	USN-8100-1
Ubuntu 24.04 LTS	linux-nvidia-tegra	6.8.0-1020.20	—
Ubuntu 24.04 LTS	linux-oem-6.17	6.17.0-1011.11	USN-8048-1
Ubuntu 24.04 LTS	linux-oracle	6.8.0-1047.48	USN-8095-1
Ubuntu 24.04 LTS	linux-raspi	6.8.0-1050.54	USN-8095-5
Ubuntu 24.04 LTS	linux-riscv +18	No fix yet	—
Ubuntu 24.04 LTS	linux-xilinx	6.8.0-1028.29	USN-8261-1
Ubuntu 22.04 LTS	linux +49	No fix yet	—
Ubuntu 22.04 LTS	linux-aws-6.8	6.8.0-1050.53~22.04.1	USN-8095-4
Ubuntu 22.04 LTS	linux-azure-6.8	6.8.0-1051.57~22.04.1	USN-8126-1
Ubuntu 22.04 LTS	linux-azure-fde-6.8	6.8.0-1058.65~22.04.1	—
Ubuntu 22.04 LTS	linux-gcp-6.8	6.8.0-1052.55~22.04.1	USN-8095-1
Ubuntu 22.04 LTS	linux-hwe-6.8 +1	6.8.0-106.106~22.04.1	USN-8095-1
Ubuntu 22.04 LTS	linux-ibm-6.8	6.8.0-1049.49~22.04.1	USN-8095-1
Ubuntu 22.04 LTS	linux-lowlatency-hwe-6.8	6.8.0-106.106.1~22.04.1	USN-8095-1
Ubuntu 22.04 LTS	linux-nvidia-6.8	6.8.0-1049.52~22.04.1	USN-8100-1
Ubuntu 22.04 LTS	linux-oracle-6.8	6.8.0-1047.48~22.04.1	USN-8095-1

Show 9 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Ubuntu 20.04 LTS	linux-gke +28	No fix yet	—
Ubuntu 18.04 LTS	linux-gcp +14	No fix yet	—
Ubuntu 16.04 LTS	linux-hwe-edge	No fix yet	—
Ubuntu Pro Realtime 24.04 LTS	linux-raspi-realtime	6.8.0-2040.41	USN-8095-5
Ubuntu Pro Realtime 24.04 LTS	linux-realtime	6.8.1-1045.46	USN-8095-3
Ubuntu Pro Realtime 24.04 LTS	linux-realtime-6.14	No fix yet	—
Ubuntu Pro Realtime 24.04 LTS	linux-realtime-6.17	6.17.0-1006.7~24.04.1	—
Ubuntu Pro Realtime 22.04 LTS	linux-realtime +1	No fix yet	—
Ubuntu Pro Realtime 22.04 LTS	linux-realtime-6.8	6.8.1-1045.46~22.04.1	USN-8095-3
Ubuntu Pro FIPS-updates 24.04 LTS	linux-aws-fips	6.8.0-1050.53+fips1	USN-8095-2
Ubuntu Pro FIPS-updates 24.04 LTS	linux-azure-fips	6.8.0-1052.58+fips1	USN-8165-1
Ubuntu Pro FIPS-updates 24.04 LTS	linux-fips	6.8.0-106.106+fips1	USN-8095-2
Ubuntu Pro FIPS-updates 24.04 LTS	linux-gcp-fips	6.8.0-1052.55+fips1	USN-8095-2
Ubuntu Pro FIPS-updates 22.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro FIPS-preview 22.04 LTS	linux-fips +3	No fix yet	—
Ubuntu Pro 20.04 LTS	linux-aws-5.15 +10	No fix yet	—

Advisories 17

WID-SEC-2025-2868 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
USN-8100-1 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
USN-8165-1 linux-azure-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
USN-8095-1 linux, linux-aws, linux-gcp, linux-gcp-6.8, linux-gke, linux-gkeop, linux-hwe-6.8, linux-ibm, linux-ibm-6.8, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8095-2 linux-fips, linux-aws-fips, linux-gcp-fips vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8126-1 linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8095-5 linux-raspi, linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8125-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8095-4 linux-aws-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8029-2 linux-aws, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8048-1 linux-oem-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8029-3 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8030-1 linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8029-1 linux, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8095-3 linux-realtime, linux-realtime-6.8 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
USN-8261-1 linux-xilinx vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
DLA-4436-1 linux-6.1 - security update Debian Security (DSA / DLA) · Jan 14, 2026

References