Input validation error in Linux kernel - CVE-2025-39933

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Main Vulnerability Database Vulnerabilities #VU116475

Input validation error in Linux kernel - CVE-2025-39933

Published: October 4, 2025


Vulnerability identifier: #VU116475
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-39933
CWE-ID: CWE-20
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 improper input validation within the recv_done() function in fs/smb/client/smbdirect.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Anolis OS
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-cross-headers
bpftool
kernel
kernel-doc
kernel-abi-stablelists
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
kernel-modules
kernel-headers
kernel-devel
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-core

How to mitigate CVE-2025-39933

Install update from vendor's repository.

kernel (Red Hat package) - addressed in versions 4.18.0-305.186.1.el8_4, 4.18.0-372.181.1.el8_6, 4.18.0-477.130.1.el8_8, 4.18.0-553.94.1.el8_10, 5.14.0-70.167.1.el9_0, 5.14.0-284.158.1.el9_2, 5.14.0-427.111.1.el9_4, 5.14.0-570.89.1.el9_6, 5.14.0-611.24.1.el9_7
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.94.1.rt7.435.el8_10, 5.14.0-70.167.1.rt21.239.el9_0, 5.14.0-284.158.1.rt14.443.el9_2
kernel-cross-headers - update to 4.18.0-553.94.1.0.1
bpftool - update to 4.18.0-553.94.1.0.1
kernel - update to 4.18.0-553.94.1.0.1
kernel-doc - update to 4.18.0-553.94.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.94.1.0.1
python3-perf - update to 4.18.0-553.94.1.0.1
perf - update to 4.18.0-553.94.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.94.1.0.1
kernel-tools-libs - update to 4.18.0-553.94.1.0.1
kernel-tools - update to 4.18.0-553.94.1.0.1
kernel-modules-extra - update to 4.18.0-553.94.1.0.1
kernel-modules - update to 4.18.0-553.94.1.0.1
kernel-headers - update to 4.18.0-553.94.1.0.1
kernel-devel - update to 4.18.0-553.94.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.94.1.0.1
kernel-debug-modules - update to 4.18.0-553.94.1.0.1
kernel-debug-devel - update to 4.18.0-553.94.1.0.1
kernel-debug-core - update to 4.18.0-553.94.1.0.1
kernel-debug - update to 4.18.0-553.94.1.0.1
kernel-core - update to 4.18.0-553.94.1.0.1

External References

Related Security Bulletins