Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: selinux: fix overlayfs mmap() and mprotect() access checks The existing SELinux…
A vulnerability in the Linux kernel's SELinux security module for overlayfs was fixed. The flaw involved improper enforcement of access controls for mmap() and mprotect() operations on overlayfs filesystems, potentially allowing unauthorized access. The issue was addressed by adding new Linux Security Module (LSM) hooks to enforce backing file access checks properly. This vulnerability affects multiple versions of the linux-hwe-edge kernel prior to specific 7.0.0 series releases. A patch is available and included in Ubuntu security updates. The CVSS score is 7.1, indicating a high severity level.
AI Analysis
Technical Summary
The Linux kernel's SELinux security model for overlayfs previously allowed access if the current task could access the top-level file and the mounter's credentials permitted access to the lower-level backing file. However, the kernel did not correctly enforce these access controls for mmap() and mprotect() operations on overlayfs filesystems. This vulnerability was resolved by introducing the security_mmap_backing_file() LSM hook to enforce mmap() backing file access and by leveraging the backing file API and a new LSM blob to enforce mprotect() access controls. The fix is included in updated linux-hwe-edge kernel packages.
Potential Impact
An attacker with local privileges could exploit this vulnerability to bypass SELinux access controls on overlayfs filesystems during mmap() and mprotect() operations. This could lead to unauthorized access to sensitive data or escalation of privileges within the affected system. The CVSS 3.1 base score of 7.1 reflects high impact on confidentiality and integrity, with no impact on availability.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of their security updates. Users should apply the updated linux-hwe-edge kernel packages and reboot their systems to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the vendor advisory instructions for updating to the fixed versions.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: selinux: fix overlayfs mmap() and mprotect() access checks The existing SELinux…
Description
A vulnerability in the Linux kernel's SELinux security module for overlayfs was fixed. The flaw involved improper enforcement of access controls for mmap() and mprotect() operations on overlayfs filesystems, potentially allowing unauthorized access. The issue was addressed by adding new Linux Security Module (LSM) hooks to enforce backing file access checks properly. This vulnerability affects multiple versions of the linux-hwe-edge kernel prior to specific 7.0.0 series releases. A patch is available and included in Ubuntu security updates. The CVSS score is 7.1, indicating a high severity level.
CVSS v3.1
Score 7.1high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's SELinux security model for overlayfs previously allowed access if the current task could access the top-level file and the mounter's credentials permitted access to the lower-level backing file. However, the kernel did not correctly enforce these access controls for mmap() and mprotect() operations on overlayfs filesystems. This vulnerability was resolved by introducing the security_mmap_backing_file() LSM hook to enforce mmap() backing file access and by leveraging the backing file API and a new LSM blob to enforce mprotect() access controls. The fix is included in updated linux-hwe-edge kernel packages.
Potential Impact
An attacker with local privileges could exploit this vulnerability to bypass SELinux access controls on overlayfs filesystems during mmap() and mprotect() operations. This could lead to unauthorized access to sensitive data or escalation of privileges within the affected system. The CVSS 3.1 base score of 7.1 reflects high impact on confidentiality and integrity, with no impact on availability.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of their security updates. Users should apply the updated linux-hwe-edge kernel packages and reboot their systems to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the vendor advisory instructions for updating to the fixed versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46054
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5a022091ae9bcd3f8327bf
Added to database: 07/17/2026, 10:21:20 UTC
Last enriched: 08/19/2026, 21:38:30 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 20
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