NULL pointer dereference in Linux kernel - CVE-2025-39692

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Main Vulnerability Database Vulnerabilities #VU114931

NULL pointer dereference in Linux kernel - CVE-2025-39692

Published: September 8, 2025


Vulnerability identifier: #VU114931
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-39692
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the ksmbd_rdma_init() and ksmbd_rdma_destroy() functions in fs/smb/server/transport_rdma.c, within the ksmbd_conn_transport_destroy() function in fs/smb/server/connection.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
Ubuntu
openEuler
linux (Debian package)
kernel-debuginfo
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)

How to mitigate CVE-2025-39692

Install update from vendor's repository.

linux (Debian package) - addressed in versions 6.1.153-1, 6.12.48-1
kernel-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
python3-perf-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
python3-perf - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
perf-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
perf - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools-devel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-source - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-headers - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-devel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-debugsource - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
bpftool-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
bpftool - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-extra-modules - update to 6.6.0-121.0.0.124
linux (Ubuntu package) - addressed in versions 6.8.0-100.100, 6.8.0-1047.51
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-100.100+fips1, 6.8.0-1046.49+fips1
linux-lowlatency (Ubuntu package) - update to 6.8.0-100.100.1
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-100.100.1~22.04.1, 6.8.0-100.100~22.04.1
linux-xilinx (Ubuntu package) - addressed in versions 6.8.0.1023.24, 6.8.0-1023.24
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1030.33, 6.8.0-1043.44, 6.8.0-1043.44~22.04.1, 6.8.0-1046.49~22.04.1
linux-gcp (Ubuntu package) - addressed in versions 6.8.0-1043.48, 6.8.0-1047.50~22.04.2
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1044.44, 6.8.0-1044.44~22.04.1
linux-nvidia-lowlatency (Ubuntu package) - update to 6.8.0-1046.49.1
linux-azure (Ubuntu package) - update to 6.8.0-1046.52
linux-azure-fips (Ubuntu package) - update to 6.8.0-1046.52+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1047.50+fips1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1047.50~22.04.2
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-raspi-realtime (Ubuntu package) - addressed in versions 6.8.0-2037.38, 6.8.1-1041.42
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1041.42~22.04.1

External References

Related Security Bulletins