Memory leak in Linux kernel - CVE-2025-39929

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Main Vulnerability Database Vulnerabilities #VU116455

Memory leak in Linux kernel - CVE-2025-39929

Published: October 4, 2025


Vulnerability identifier: #VU116455
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-2025-39929
CWE-ID: CWE-401
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 memory leak within the smbd_negotiate() function in fs/smb/client/smbdirect.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Live Patching
Ubuntu
openEuler
kgraft-patch-4_12_14-122_280-default
gfs2-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-default-man
kernel-macros
kernel-devel
kernel-source
kernel-default
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-devel
ocfs2-kmp-default
kernel-syms
kernel-default-base
gfs2-kmp-default
kernel-default-debugsource
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default
linux (Debian package)
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-tools-debuginfo
kernel-headers
kernel-tools
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-realtime (Ubuntu package)

How to mitigate CVE-2025-39929

Install update from vendor's repository.

kgraft-patch-4_12_14-122_280-default - update to 1-8.5.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.280.1
kernel-default-kgraft-devel - update to 4.12.14-122.280.1
kernel-default-kgraft - update to 4.12.14-122.280.1
kernel-default-devel-debuginfo - update to 4.12.14-122.280.1
kernel-default-man - update to 4.12.14-122.280.1
kernel-macros - update to 4.12.14-122.280.1
kernel-devel - update to 4.12.14-122.280.1
kernel-source - update to 4.12.14-122.280.1
kernel-default - update to 4.12.14-122.280.1
kernel-default-base-debuginfo - update to 4.12.14-122.280.1
kernel-default-debuginfo - update to 4.12.14-122.280.1
kernel-default-devel - update to 4.12.14-122.280.1
ocfs2-kmp-default - update to 4.12.14-122.280.1
kernel-syms - update to 4.12.14-122.280.1
kernel-default-base - update to 4.12.14-122.280.1
gfs2-kmp-default - update to 4.12.14-122.280.1
kernel-default-debugsource - update to 4.12.14-122.280.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.280.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.280.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.280.1
dlm-kmp-default - update to 4.12.14-122.280.1
cluster-md-kmp-default - update to 4.12.14-122.280.1
linux (Debian package) - update to 6.1.158-1
kernel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
bpftool - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
bpftool-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-debugsource - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-devel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-headers - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-source - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools-devel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
perf - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
perf-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
python3-perf - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
python3-perf-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-extra-modules - update to 6.6.0-138.0.0.132
linux (Ubuntu package) - addressed in versions 6.8.0-106.106, 6.8.0-106.106.1, 6.8.0-106.106.1~22.04.1, 6.8.0-106.106~22.04.1, 6.8.0-1035.38, 6.8.0-1047.48, 6.8.0-1047.48~22.04.1, 6.8.0-1048.53, 6.8.0-1049.49, 6.8.0-1049.49~22.04.1, 6.8.0-1050.53, 6.8.0-1052.55, 6.8.0-1052.55~22.04.1
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-106.106+fips1, 6.8.0-1050.53+fips1, 6.8.0-1052.55+fips1
linux-xilinx (Ubuntu package) - update to 6.8.0-1029.30
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1049.52, 6.8.0-1049.52.1, 6.8.0-1049.52~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1050.53~22.04.1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1050.54, 6.8.0-2040.41
linux-azure (Ubuntu package) - update to 6.8.0-1051.57
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1052.58+fips1
linux-realtime (Ubuntu package) - addressed in versions 6.8.1-1045.46, 6.8.1-1045.46~22.04.1

External References

Related Security Bulletins