CVE-2026-46054 selinux: fix overlayfs mmap() and mprotect() access checks
Attackers can bypass SELinux access controls on overlayfs files via mmap and mprotect, potentially accessing restricted data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46054?
CVE-2026-46054 is a high-severity missing authorization vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
selinux: fix overlayfs mmap() and mprotect() access checks
The existing SELinux security model for overlayfs is to allow access if the current task is able to access the top level file (the "user" file) and the mounter's credentials are sufficient to access the lower level file (the "backing" file). Unfortunately, the current code does not properly enforce these access controls for both mmap() and mprotect() operations on overlayfs filesystems.
This patch makes use of the newly created security_mmap_backing_file() LSM hook to provide the missing backing file enforcement for mmap() operations, and leverages the backing file API and new LSM blob to provide the necessary information to properly enforce the mprotect() access controls.
Which versions are affected by CVE-2026-46054?
It affects 1 product.
Linux distribution packages (40)
bpftool AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-abi-stablelists AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-core AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-cross-headers AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-debug AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-debug-core AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-debug-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-debug-modules AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-debug-modules-extra AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-doc AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-headers AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-modules AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-modules-extra AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-rt AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-core AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-debug AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-debug-core AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-debug-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-debug-modules AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-debug-modules-extra AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-modules AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-rt-modules-extra AlmaLinux:8 | All versions | 4.18.0-553.137.1.rt7.478.el8_10 |
kernel-tools AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-tools-libs AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-tools-libs-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-zfcpdump AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-zfcpdump-core AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-zfcpdump-devel AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-zfcpdump-modules AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
kernel-zfcpdump-modules-extra AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
perf AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
python3-perf AlmaLinux:8 | All versions | 4.18.0-553.137.1.el8_10 |
bpftool Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-553.137.1.el8_10 |
bpftool-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-553.137.1.el8_10 |
kernel Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-553.137.1.el8_10 |
kernel-abi-stablelists Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-553.137.1.el8_10 |
kernel-core Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-553.137.1.el8_10 |
Products include Linux kernel.
How do I fix CVE-2026-46054?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-46054 being exploited?
There is no known exploitation of CVE-2026-46054 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as ALSA-2026:27811, ALSA-2026:27812, AZL-88715, BELL-CVE-2026-46054, DEBIAN-CVE-2026-46054, GHSA-xg2q-7399-f2r3 and 10 more.