Use-after-free in Linux kernel - CVE-2026-68121

Vulnerability identifier: #VU142199

CSH Severity: Low

CVSS v4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68121

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to a use-after-free in pppoe_sendmsg() when handling a blocked send while a non-Ethernet port is added to an empty team device. A local user can trigger skb head reallocation and subsequent writes through a stale PPPoE header pointer to cause memory corruption.

The issue occurs because device header callbacks may reallocate the skb head and invalidate saved pointers into it.

Linux kernel
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
SUSE Linux Enterprise Server 11
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
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
SUSE Linux Enterprise Live Patching
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-livepatch-6_4_0-150700_53_81-default
kernel-docs
kernel-xen
kernel-trace
kernel-ec2
kernel-default
kernel-ec2-debugsource
kernel-trace-debuginfo
kernel-trace-debugsource
kernel-trace-devel-debuginfo
kernel-ec2-devel-debuginfo
kernel-xen-base
kernel-source
kernel-default-base
kernel-default-devel-debuginfo
kernel-trace-base
kernel-default-devel
kernel-syms
kernel-ec2-base
kernel-xen-devel-debuginfo
kernel-trace-devel
kernel-ec2-debuginfo
kernel-xen-devel
kernel-default-debugsource
kernel-ec2-devel
kernel-xen-debuginfo
kernel-default-debuginfo
kernel-xen-debugsource
kernel-default-extra
kernel-default-extra-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-default-livepatch-devel
kernel-azure-debugsource
kernel-azure-devel
kernel-zfcpdump-debugsource
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-macros
kernel-devel
kernel-zfcpdump
gfs2-kmp-default
kernel-default-livepatch
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-obs-build-debugsource
kernel-obs-build
kernel-azure
kernel-64kb-debugsource
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debuginfo
kernel-64kb
kernel-zfcpdump-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default - update to 1-150700.15.3.1
kernel-docs - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-xen - update to 3.0.101-108.220.1
kernel-trace - update to 3.0.101-108.220.1
kernel-ec2 - update to 3.0.101-108.220.1
kernel-default - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-ec2-debugsource - update to 3.0.101-108.220.1
kernel-trace-debuginfo - update to 3.0.101-108.220.1
kernel-trace-debugsource - update to 3.0.101-108.220.1
kernel-trace-devel-debuginfo - update to 3.0.101-108.220.1
kernel-ec2-devel-debuginfo - update to 3.0.101-108.220.1
kernel-xen-base - update to 3.0.101-108.220.1
kernel-source - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-default-base - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1.150700.17.45.1
kernel-default-devel-debuginfo - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-trace-base - update to 3.0.101-108.220.1
kernel-default-devel - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-syms - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-ec2-base - update to 3.0.101-108.220.1
kernel-xen-devel-debuginfo - update to 3.0.101-108.220.1
kernel-trace-devel - update to 3.0.101-108.220.1
kernel-ec2-debuginfo - update to 3.0.101-108.220.1
kernel-xen-devel - update to 3.0.101-108.220.1
kernel-default-debugsource - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-ec2-devel - update to 3.0.101-108.220.1
kernel-xen-debuginfo - update to 3.0.101-108.220.1
kernel-default-debuginfo - addressed in versions 3.0.101-108.220.1, 6.4.0-150700.53.81.1
kernel-xen-debugsource - update to 3.0.101-108.220.1
kernel-default-extra - update to 6.4.0-150700.53.81.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.81.1
cluster-md-kmp-default - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default - update to 6.4.0-150700.53.81.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
dlm-kmp-default - update to 6.4.0-150700.53.81.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-macros - update to 6.4.0-150700.53.81.1
kernel-devel - update to 6.4.0-150700.53.81.1
kernel-zfcpdump - update to 6.4.0-150700.53.81.1
gfs2-kmp-default - update to 6.4.0-150700.53.81.1
kernel-default-livepatch - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default - update to 6.4.0-150700.53.81.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.81.1
kernel-obs-build - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb-devel - update to 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.81.1

• https://git.kernel.org/stable/c/6866abf59976d273164a6624234d96a967280223
• https://git.kernel.org/stable/c/7e9fbd7f96bcde63a7c798fe16b38cedee7a1501
• https://git.kernel.org/stable/c/bed4caecd723693f750e13adbb2c42ca1249a3fd
• https://git.kernel.org/stable/c/e6493a4d1ee17595766165fa446d45b7e0c318d0
• https://git.kernel.org/stable/c/e9c238f6fe42fb1b4dba3a578277de32cb487937

• Use-after-free in Linux kernel net ppp driver
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel