High · 8.8 CVE-2023-53358 EUVD-2023-59968GHSA-j8wr-29h3-4xqr

ksmbd: fix racy issue under cocurrent smb2 tree disconnect

Published Sep 17, 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-6.2 Package: linux-aws-6.5 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-6.2 Package: linux-azure-6.5 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips 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-6.2 Package: linux-gcp-6.5 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-6.2 Package: linux-hwe-6.5 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-intel 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-nvidia Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 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-6.5 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-6.5 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime 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-6.5 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

ksmbd: fix racy issue under cocurrent smb2 tree disconnect

There is UAF issue under cocurrent smb2 tree disconnect.
This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent
access.

Affected products

Vendor	Product	Affected	Fixed
Linux	Linux	5.15	5.15.145

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	6.3.7-1	—
Debian 13	linux	6.3.7-1	—
Debian 12	linux	6.1.37-1	—

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu Nvidia-BlueField 22.04 LTS	linux-bluefield	5.15.0-1040.42	—
Ubuntu 24.04 LTS	linux-intel +9	No fix yet	—
Ubuntu 22.04 LTS	linux +1	5.15.0-102.112	—
Ubuntu 22.04 LTS	linux-aws	5.15.0-1057.63	—
Ubuntu 22.04 LTS	linux-azure	5.15.0-1060.69	—
Ubuntu 22.04 LTS	linux-azure-fde	5.15.0-1060.69.1	—
Ubuntu 22.04 LTS	linux-gcp	5.15.0-1055.63	—
Ubuntu 22.04 LTS	linux-gke +1	5.15.0-1054.59	—
Ubuntu 22.04 LTS	linux-gkeop	5.15.0-1040.46	—
Ubuntu 22.04 LTS	linux-ibm +1	5.15.0-1050.53	—
Ubuntu 22.04 LTS	linux-intel-iotg	5.15.0-1052.58	—
Ubuntu 22.04 LTS	linux-nvidia	5.15.0-1048.48	—
Ubuntu 22.04 LTS	linux-nvidia-tegra	5.15.0-1025.25	—
Ubuntu 22.04 LTS	linux-nvidia-tegra-igx	5.15.0-1012.12	—
Ubuntu 22.04 LTS	linux-oracle	5.15.0-1055.61	—
Ubuntu 22.04 LTS	linux-riscv +32	No fix yet	—
Ubuntu 22.04 LTS	linux-xilinx-zynqmp	5.15.0-1030.34	—
Ubuntu 20.04 LTS	linux-aws-5.15	5.15.0-1057.63~20.04.1	—
Ubuntu 20.04 LTS	linux-azure-5.15	5.15.0-1060.69~20.04.1	—
Ubuntu 20.04 LTS	linux-gcp-5.15	5.15.0-1055.63~20.04.1	—
Ubuntu 20.04 LTS	linux-gke +28	No fix yet	—
Ubuntu 20.04 LTS	linux-hwe-5.15 +1	5.15.0-102.112~20.04.1	—
Ubuntu 20.04 LTS	linux-ibm-5.15	5.15.0-1050.53~20.04.1	—
Ubuntu 20.04 LTS	linux-intel-iotg-5.15	5.15.0-1052.58~20.04.1	—
Ubuntu 20.04 LTS	linux-nvidia-tegra-5.15	5.15.0-1025.25~20.04.1	—
Ubuntu 20.04 LTS	linux-oracle-5.15	5.15.0-1055.61~20.04.1	—
Ubuntu 20.04 LTS	linux-riscv-5.15	5.15.0-1053.57~20.04.1	—
Ubuntu 18.04 LTS	linux-gcp +14	No fix yet	—

Show 4 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Ubuntu 16.04 LTS	linux-hwe-edge	No fix yet	—
Ubuntu Pro Realtime 22.04 LTS	linux-intel-iot-realtime	5.15.0-1050.52	—
Ubuntu Pro Realtime 22.04 LTS	linux-realtime	5.15.0-1058.66	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-aws-fips	5.15.0-1057.63+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-azure-fips	5.15.0-1060.69+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-fips	5.15.0-102.112+fips1	—
Ubuntu Pro FIPS-updates 22.04 LTS	linux-gcp-fips	5.15.0-1055.63+fips2	—
Ubuntu Pro FIPS-preview 22.04 LTS	linux-fips +3	No fix yet	—

Advisories 1

WID-SEC-2025-2087 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026

References