Improper access control in Linux kernel - CVE-2026-90315

Vulnerability identifier: #VU151166

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-90315

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to bypass kernel lockdown PCI access restrictions.

The vulnerability exists due to improper access control in the legacy PCI sysfs I/O and memory handlers when accessing legacy I/O and memory spaces while the kernel is locked down. A local privileged user can write arbitrary I/O ports and map legacy I/O and memory spaces to bypass kernel lockdown PCI access restrictions.

Linux kernel
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
Public Cloud Module
Development Tools Module
Basesystem Module
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Legacy Module
Ubuntu
linux (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
kernel-livepatch-SLE15-SP7-RT_Update_22-debugsource
kernel-livepatch-6_4_0-150700_7_81-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_81-rt
kernel-livepatch-SLE15-SP7_Update_23-debugsource
kernel-livepatch-6_4_0-150700_53_87-default-debuginfo
kernel-livepatch-6_4_0-150700_53_87-default
dlm-kmp-rt
kernel-rt-devel
gfs2-kmp-rt
ocfs2-kmp-rt
kernel-rt
kernel-source-rt
kernel-devel-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt-debugsource
kernel-rt-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-docs
kernel-source
reiserfs-kmp-default
kernel-64kb-debugsource
kernel-macros
kernel-64kb-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-azure
kernel-azure-debugsource
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-devel
kernel-default-extra
kernel-default-extra-debuginfo
kernel-64kb-devel
cluster-md-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-debugsource
cluster-md-kmp-default
kernel-default-debuginfo
dlm-kmp-default
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default
kernel-default-devel
kernel-default-devel-debuginfo
kernel-devel
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-64kb
kernel-64kb-devel-debuginfo
kernel-default-base

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
kernel-livepatch-SLE15-SP7-RT_Update_22-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_81-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_81-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_23-debugsource - update to 1-150700.15.3.2
kernel-livepatch-6_4_0-150700_53_87-default-debuginfo - update to 1-150700.15.3.2
kernel-livepatch-6_4_0-150700_53_87-default - update to 1-150700.15.3.2
dlm-kmp-rt - update to 6.4.0-150700.7.81.1
kernel-rt-devel - update to 6.4.0-150700.7.81.1
gfs2-kmp-rt - update to 6.4.0-150700.7.81.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.81.1
kernel-rt - update to 6.4.0-150700.7.81.1
kernel-source-rt - update to 6.4.0-150700.7.81.1
kernel-devel-rt - update to 6.4.0-150700.7.81.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.81.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.81.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
kernel-rt-debugsource - update to 6.4.0-150700.7.81.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.81.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
kernel-syms-rt - update to 6.4.0-150700.7.81.1
kernel-syms - update to 6.4.0-150700.53.87.1
kernel-obs-build - update to 6.4.0-150700.53.87.2
kernel-obs-build-debugsource - update to 6.4.0-150700.53.87.2
kernel-docs - update to 6.4.0-150700.53.87.3
kernel-source - update to 6.4.0-150700.53.87.3
reiserfs-kmp-default - update to 6.4.0-150700.53.87.3
kernel-64kb-debugsource - update to 6.4.0-150700.53.87.3
kernel-macros - update to 6.4.0-150700.53.87.3
kernel-64kb-debuginfo - update to 6.4.0-150700.53.87.3
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
kernel-default-livepatch-devel - update to 6.4.0-150700.53.87.3
kernel-default-livepatch - update to 6.4.0-150700.53.87.3
kernel-azure - update to 6.4.0-150700.53.87.3
kernel-azure-debugsource - update to 6.4.0-150700.53.87.3
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.87.3
kernel-azure-debuginfo - update to 6.4.0-150700.53.87.3
kernel-azure-devel - update to 6.4.0-150700.53.87.3
kernel-default-extra - update to 6.4.0-150700.53.87.3
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.87.3
kernel-64kb-devel - update to 6.4.0-150700.53.87.3
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
gfs2-kmp-default - update to 6.4.0-150700.53.87.3
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
kernel-default-debugsource - update to 6.4.0-150700.53.87.3
cluster-md-kmp-default - update to 6.4.0-150700.53.87.3
kernel-default-debuginfo - update to 6.4.0-150700.53.87.3
dlm-kmp-default - update to 6.4.0-150700.53.87.3
ocfs2-kmp-default - update to 6.4.0-150700.53.87.3
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
kernel-default - update to 6.4.0-150700.53.87.3
kernel-default-devel - update to 6.4.0-150700.53.87.3
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.87.3
kernel-devel - update to 6.4.0-150700.53.87.3
kernel-zfcpdump - update to 6.4.0-150700.53.87.3
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.87.3
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.87.3
kernel-64kb - update to 6.4.0-150700.53.87.3
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.87.3
kernel-default-base - update to 6.4.0-150700.53.87.3.150700.17.49.2

• https://git.kernel.org/stable/c/747b9bbbbdfdee51aee2456388f9b94b5086de4d
• https://git.kernel.org/stable/c/cd07aef510ac6a2873e01f9ddddc5492490b0067

• Improper access control in Linux kernel pci driver
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more