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Fencer Vulns
no cvss —

CVE-2026-90315 json

PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers

published 2026-09-17 53 d ago modified 2026-10-19 21 d ago also EUVD-2026-81976

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers

Currently, the legacy I/O and memory sysfs handlers do not check security_locked_down(LOCKDOWN_PCI_ACCESS), leaving the legacy_io and legacy_mem files unprotected when the kernel is locked down.

Commit eb627e17727e ("PCI: Lock down BAR access when the kernel is locked down") added the check to pci_write_config(), pci_mmap_resource(), and pci_write_resource_io() to prevent userspace from programming DMA-capable hardware that could be used to modify kernel code, but did not cover the legacy handlers.

As a result, root can still write arbitrary I/O ports and map the legacy I/O and memory spaces while the kernel is locked down, which is the same capability the lockdown is meant to remove.

Add the same check to pci_write_legacy_io(), pci_mmap_legacy_mem(), and pci_mmap_legacy_io().

These generic handlers cover both architectures that define HAVE_PCI_LEGACY (such as Alpha and PowerPC).

[bhelgaas: add Link]

Patch / fix

  • Linux Linux 6.18.57, 7.2.6, 7.3
  • linux Debian 14 7.2.6-1

debian advisories DEBIAN-CVE-2026-90315

  • linux Ubuntu 26.04 LTS 7.0.0-42.42
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1017.17
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-42.42.1
  • linux-oracle Ubuntu 26.04 LTS 7.0.0-1015.16
  • linux-hwe-7.0 Ubuntu 24.04 LTS 7.0.0-42.42~24.04.1
  • linux-oem-7.0 Ubuntu 26.04 LTS 7.0.0-1017.17

ubuntu advisories UBUNTU-CVE-2026-90315

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.81.1
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.81.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.81.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.87.3
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.87.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.87.3
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.87.3
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.87.3

suse advisories SUSE-SU-2026:4940-1SUSE-SU-2026:4935-1SUSE-SU-2026:24473-1SUSE-SU-2026:24553-1SUSE-SU-2026:24371-1SUSE-SU-2026:24379-1

  • kernel-source openSUSE Tumbleweed 7.2.7-1.1

opensuse advisories openSUSE-SU-2026:11880-1

  • kernel AlmaLinux 10 6.12.0-211.74.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.74.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.74.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.74.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.74.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.74.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.74.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.74.1.el10_2

almalinux advisories ALSA-2026:95367

  • kernel Rocky Linux 10 6.12.0-211.74.1.el10_2

rocky linux advisories RLSA-2026:95367

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-90315 updated cvss 7.0

kernel: PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers

  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    under investigation
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.74.1.el10_2 Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.74.1.el10_2, perf 6.12.0-211.74.1.el10_2, rtla 6.12.0-211.74.1.el10_2, python3-perf 6.12.0-211.74.1.el10_2, kernel-devel-matched 6.12.0-211.74.1.el10_2, kernel-64k-devel-matched 6.12.0-211.74.1.el10_2, +7 more Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.74.1.el10_2, kernel-64k 6.12.0-211.74.1.el10_2, kernel-core 6.12.0-211.74.1.el10_2, kernel-tools 6.12.0-211.74.1.el10_2, kernel-modules 6.12.0-211.74.1.el10_2, kernel-64k-core 6.12.0-211.74.1.el10_2, +28 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.74.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.74.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.74.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.74.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.74.1.el10_2 Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.74.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.74.1.el10_2 Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.74.1.el10_2, kernel-rt-64k 6.12.0-211.74.1.el10_2, kernel-rt-core 6.12.0-211.74.1.el10_2, kernel-rt-modules 6.12.0-211.74.1.el10_2, kernel-rt-64k-core 6.12.0-211.74.1.el10_2, kernel-rt-debug-core 6.12.0-211.74.1.el10_2, +14 more
    +1 more products
    Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.74.1.el10_2, kernel-rt-core 6.12.0-211.74.1.el10_2, kernel-rt-modules 6.12.0-211.74.1.el10_2, kernel-rt-debug-core 6.12.0-211.74.1.el10_2, kernel-rt-modules-core 6.12.0-211.74.1.el10_2, kernel-rt-debug-modules 6.12.0-211.74.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:95367
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.