Use-after-free in Linux kernel - CVE-2025-39984

Vulnerability identifier: #VU117260

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-39984

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the tun_get_user() function in drivers/net/tun.c. A local user can escalate privileges on the system.

Linux kernel
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
SUSE Linux Enterprise Live Patching
Public Cloud Module
SUSE Real Time Module
Legacy Module
Development Tools Module
Basesystem Module
kernel-livepatch-SLE15-SP7-RT_Update_6-debugsource
kernel-livepatch-6_4_0-150700_7_22-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_22-rt
kernel-livepatch-SLE15-SP7_Update_6-debugsource
kernel-livepatch-6_4_0-150700_53_22-default
kernel-livepatch-6_4_0-150700_53_22-default-debuginfo
kernel-rt-devel
kernel-rt-debuginfo
kernel-rt-debugsource
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
kernel-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
gfs2-kmp-rt
kernel-source-rt
kernel-devel-rt
dlm-kmp-rt
kernel-azure-devel
kernel-azure
kernel-azure-debugsource
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-devel-azure
kernel-source-azure
kernel-default-livepatch
kernel-64kb-debuginfo
kernel-default-livepatch-devel
kernel-default-extra
kernel-default-extra-debuginfo
kernel-64kb
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-64kb-debugsource
kernel-default
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-devel-debuginfo
kernel-default-devel
kernel-macros
kernel-devel
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-obs-build-debugsource
kernel-docs
gfs2-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default
gfs2-kmp-default-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-source
kernel-obs-build
kernel-syms
dlm-kmp-default
kernel-default-base
kernel-rt-64k-modules (Red Hat package)
kernel-rt-64k-devel (Red Hat package)
kernel-rt-64k-debug-modules-extra (Red Hat package)
kernel-rt-64k-debug-modules-core (Red Hat package)
kernel-rt-64k-debug-modules (Red Hat package)
kernel-rt-64k-debug-devel (Red Hat package)
kernel-rt-64k-debug-core (Red Hat package)
kernel-rt-64k-debug (Red Hat package)
kernel-rt-64k-core (Red Hat package)
kernel-rt-64k (Red Hat package)
kernel-rt (Red Hat package)
libperf (Red Hat package)
kernel-tools-libs-devel (Red Hat package)
kernel-cross-headers (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
kernel-tools-libs (Red Hat package)
kernel-rt-64k-modules-core (Red Hat package)
kernel-rt-64k-modules-extra (Red Hat package)
kernel-rt-core (Red Hat package)
kernel-rt-debug (Red Hat package)
kernel-rt-debug-core (Red Hat package)
kernel-rt-debug-devel (Red Hat package)
kernel-rt-debug-modules (Red Hat package)
kernel-rt-debug-modules-core (Red Hat package)
kernel-rt-debug-modules-extra (Red Hat package)
kernel-rt-devel (Red Hat package)
kernel-rt-modules (Red Hat package)
kernel-rt-modules-core (Red Hat package)
kernel-rt-modules-extra (Red Hat package)
kernel-rt-debug-kvm (Red Hat package)
kernel-rt-kvm (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-debug (Red Hat package)
kernel-debug-core (Red Hat package)
kernel-debug-devel (Red Hat package)
kernel-debug-devel-matched (Red Hat package)
kernel-debug-modules (Red Hat package)
kernel-debug-modules-core (Red Hat package)
kernel-debug-modules-extra (Red Hat package)
kernel-debug-uki-virt (Red Hat package)
kernel-devel (Red Hat package)
kernel-devel-matched (Red Hat package)
kernel-headers (Red Hat package)
kernel-modules (Red Hat package)
kernel-modules-core (Red Hat package)
kernel-modules-extra (Red Hat package)
kernel-tools (Red Hat package)
kernel-uki-virt (Red Hat package)
kernel-uki-virt-addons (Red Hat package)
perf (Red Hat package)
python3-perf (Red Hat package)
rtla (Red Hat package)
rv (Red Hat package)
kernel-zfcpdump (Red Hat package)
kernel-zfcpdump-core (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-zfcpdump-modules (Red Hat package)
kernel-zfcpdump-modules-core (Red Hat package)
kernel-zfcpdump-modules-extra (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel (Red Hat package)

Install update from vendor's repository.

kernel-livepatch-SLE15-SP7-RT_Update_6-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_22-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_22-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_6-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_22-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_22-default-debuginfo - update to 1-150700.15.3.1
kernel-rt-devel - update to 6.4.0-150700.7.22.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.22.1
kernel-rt-debugsource - update to 6.4.0-150700.7.22.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.22.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.22.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.22.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.22.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.22.1
kernel-syms-rt - update to 6.4.0-150700.7.22.1
kernel-rt - update to 6.4.0-150700.7.22.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.22.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.22.1
gfs2-kmp-rt - update to 6.4.0-150700.7.22.1
kernel-source-rt - update to 6.4.0-150700.7.22.1
kernel-devel-rt - update to 6.4.0-150700.7.22.1
dlm-kmp-rt - update to 6.4.0-150700.7.22.1
kernel-azure-devel - update to 6.4.0-150700.20.18.1
kernel-azure - update to 6.4.0-150700.20.18.1
kernel-azure-debugsource - update to 6.4.0-150700.20.18.1
kernel-syms-azure - update to 6.4.0-150700.20.18.1
kernel-azure-debuginfo - update to 6.4.0-150700.20.18.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.20.18.1
kernel-devel-azure - update to 6.4.0-150700.20.18.1
kernel-source-azure - update to 6.4.0-150700.20.18.1
kernel-default-livepatch - update to 6.4.0-150700.53.22.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.22.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.22.1
kernel-default-extra - update to 6.4.0-150700.53.22.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.22.1
kernel-64kb - update to 6.4.0-150700.53.22.1
kernel-64kb-devel - update to 6.4.0-150700.53.22.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.22.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.22.1
kernel-default - update to 6.4.0-150700.53.22.1
kernel-default-debuginfo - update to 6.4.0-150700.53.22.1
kernel-default-debugsource - update to 6.4.0-150700.53.22.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.22.1
kernel-default-devel - update to 6.4.0-150700.53.22.1
kernel-macros - update to 6.4.0-150700.53.22.1
kernel-devel - update to 6.4.0-150700.53.22.1
kernel-zfcpdump - update to 6.4.0-150700.53.22.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.22.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.22.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.22.1
kernel-docs - update to 6.4.0-150700.53.22.1
gfs2-kmp-default - update to 6.4.0-150700.53.22.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.22.1
ocfs2-kmp-default - update to 6.4.0-150700.53.22.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.22.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.22.1
cluster-md-kmp-default - update to 6.4.0-150700.53.22.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.22.1
reiserfs-kmp-default - update to 6.4.0-150700.53.22.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.22.1
kernel-source - update to 6.4.0-150700.53.22.1
kernel-obs-build - update to 6.4.0-150700.53.22.1
kernel-syms - update to 6.4.0-150700.53.22.1
dlm-kmp-default - update to 6.4.0-150700.53.22.1
kernel-default-base - update to 6.4.0-150700.53.22.1.150700.17.15.1
kernel-rt-64k-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-debug (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt (Red Hat package) - update to 6.12.0-55.50.1.el10_0
libperf (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-tools-libs-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-cross-headers (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-64k-devel-matched (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-tools-libs (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-64k-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-debug-kvm (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-rt-kvm (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-64k-debug-devel-matched (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-devel-matched (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-debug-uki-virt (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-devel-matched (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-headers (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-tools (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-uki-virt (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-uki-virt-addons (Red Hat package) - update to 6.12.0-55.50.1.el10_0
perf (Red Hat package) - update to 6.12.0-55.50.1.el10_0
python3-perf (Red Hat package) - update to 6.12.0-55.50.1.el10_0
rtla (Red Hat package) - update to 6.12.0-55.50.1.el10_0
rv (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-devel-matched (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-modules (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-modules-core (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-zfcpdump-modules-extra (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-64k-debug-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel-64k-devel (Red Hat package) - update to 6.12.0-55.50.1.el10_0
kernel (Red Hat package) - update to 6.12.0-124.21.1.el10_1

• https://git.kernel.org/stable/c/1091860a16a86ccdd77c09f2b21a5f634f5ab9ec
• https://git.kernel.org/stable/c/1697577e1669b0321d02cd848384a5d33e284296
• https://git.kernel.org/stable/c/953200d56fc23eebf80a5ad9eed6e2e8a3065093

• Use-after-free in Linux kernel net driver
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Red Hat Enterprise Linux 10 update for kernel
• Red Hat Enterprise Linux 10 update for kernel