Improper access control in Linux kernel - CVE-2026-68294

Vulnerability identifier: #VU142022

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68294

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass network namespace isolation.

The vulnerability exists due to improper access control in the AF_QIPCRTR socket creation logic and global QRTR state handling when creating and using QRTR sockets from a separate network namespace. A local user can create an AF_QIPCRTR socket in another network namespace and send crafted QRTR datagrams to sockets owned by a different namespace to bypass network namespace isolation.

The receiving socket may treat the message as originating from node id 1, making it indistinguishable from a legitimate local client.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
kernel-rt (Red Hat package)
kernel (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
perf (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
rtla (Red Hat package)
kernel-zfcpdump-modules-extra (Red Hat package)
kernel-zfcpdump-modules-core (Red Hat package)
kernel-zfcpdump-modules (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-zfcpdump-core (Red Hat package)
kernel-zfcpdump (Red Hat package)
python3-perf (Red Hat package)
libperf (Red Hat package)
kernel-rt-64k (Red Hat package)
kernel-rt-64k-core (Red Hat package)
kernel-rt-64k-debug (Red Hat package)
kernel-rt-64k-debug-core (Red Hat package)
kernel-rt-64k-debug-devel (Red Hat package)
kernel-rt-64k-debug-modules (Red Hat package)
kernel-rt-64k-debug-modules-core (Red Hat package)
kernel-rt-64k-debug-modules-extra (Red Hat package)
kernel-rt-64k-devel (Red Hat package)
kernel-rt-64k-modules (Red Hat package)
kernel-rt-64k-modules-core (Red Hat package)
kernel-rt-64k-modules-extra (Red Hat package)
rv (Red Hat package)
kernel-cross-headers (Red Hat package)
kernel-tools-libs-devel (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-modules-extra-matched (Red Hat package)
kernel-uki-virt-addons (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-tools (Red Hat package)
kernel-tools-libs (Red Hat package)
kernel-uki-virt (Red Hat package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.163.1.rt7.504.el8_10, 6.12.0-211.56.1.el10_2
kernel (Red Hat package) - update to 5.14.0-687.48.1.el9_8
kernel-64k-devel-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
perf (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-64k-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-64k-debug-devel-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-64k-debug-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
rtla (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-devel-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-zfcpdump (Red Hat package) - update to 6.12.0-211.56.1.el10_2
python3-perf (Red Hat package) - update to 6.12.0-211.56.1.el10_2
libperf (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-debug-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-64k-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
rv (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-cross-headers (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-tools-libs-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-devel-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-debug-uki-virt (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-devel-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-headers (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-modules-extra-matched (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-uki-virt-addons (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-debug-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-devel (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-modules (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-modules-core (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-rt-modules-extra (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-tools (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-tools-libs (Red Hat package) - update to 6.12.0-211.56.1.el10_2
kernel-uki-virt (Red Hat package) - update to 6.12.0-211.56.1.el10_2

• https://git.kernel.org/stable/c/3b536db8fb32da9e9c62f2bb45e2e319331f0426
• https://git.kernel.org/stable/c/4b95e1f0d6e6342c427cb341ee18a894b146b789
• https://git.kernel.org/stable/c/659b9b4f194bb56b9903cc95e786ef1d438baa7d
• https://git.kernel.org/stable/c/8150c48fb978e01689f94ed80148f8a7499ae571
• https://git.kernel.org/stable/c/f488116df769bdaf89c93371350e49e12133e70f

• Improper access control in Linux kernel qrtr
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 10 update for kernel