Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix unmap race with PMD migration entries The following race is… (CVE-2026-53108)
A race condition vulnerability in the Linux kernel's powerpc/64s architecture involving PMD migration entries has been fixed. The issue occurs during concurrent move_pages and munmap operations on huge pages, potentially causing kernel instability. The vulnerability has been addressed in Linux kernel updates for various Ubuntu 26.04 LTS packages. The CVSS score is 4.7 (medium severity) with no known exploits in the wild.
AI Analysis
Technical Summary
CVE-2026-53108 is a race condition in the Linux kernel's powerpc/64s architecture related to unmapping race conditions with PMD migration entries. Specifically, when move_pages is called on a PMD Transparent Huge Page (THP), an intermediate state can cause the PMD entry to act as a migration swap entry. Concurrent munmap operations during this state can trigger a VM_BUG_ON() in pmdp_huge_get_and_clear_full(), leading to kernel instability. This race condition has been fixed by a patch that prevents the race window. The vulnerability affects multiple Ubuntu 26.04 LTS kernel packages and requires a system update and reboot to apply the fix.
Potential Impact
The vulnerability can cause kernel instability or crashes due to a race condition in memory management on powerpc/64s architectures. The CVSS vector indicates local attack with high attack complexity and low privileges required, resulting in no confidentiality or integrity impact but high availability impact. There are no known exploits in the wild. The impact is limited to denial of service or system instability.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel package versions listed in the Ubuntu security advisories USN-8566-1 and USN-8568-1. After updating, a system reboot is required to complete remediation. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Standard system upgrades will handle this automatically unless kernel metapackages were manually removed.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fix unmap race with PMD migration entries The following race is… (CVE-2026-53108)
Description
A race condition vulnerability in the Linux kernel's powerpc/64s architecture involving PMD migration entries has been fixed. The issue occurs during concurrent move_pages and munmap operations on huge pages, potentially causing kernel instability. The vulnerability has been addressed in Linux kernel updates for various Ubuntu 26.04 LTS packages. The CVSS score is 4.7 (medium severity) with no known exploits in the wild.
CVSS v3.1
Score 4.7medium
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.2?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]+cvm1.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.3?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email 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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
CVE-2026-53108 is a race condition in the Linux kernel's powerpc/64s architecture related to unmapping race conditions with PMD migration entries. Specifically, when move_pages is called on a PMD Transparent Huge Page (THP), an intermediate state can cause the PMD entry to act as a migration swap entry. Concurrent munmap operations during this state can trigger a VM_BUG_ON() in pmdp_huge_get_and_clear_full(), leading to kernel instability. This race condition has been fixed by a patch that prevents the race window. The vulnerability affects multiple Ubuntu 26.04 LTS kernel packages and requires a system update and reboot to apply the fix.
Potential Impact
The vulnerability can cause kernel instability or crashes due to a race condition in memory management on powerpc/64s architectures. The CVSS vector indicates local attack with high attack complexity and low privileges required, resulting in no confidentiality or integrity impact but high availability impact. There are no known exploits in the wild. The impact is limited to denial of service or system instability.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed Linux kernel package versions listed in the Ubuntu security advisories USN-8566-1 and USN-8568-1. After updating, a system reboot is required to complete remediation. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Standard system upgrades will handle this automatically unless kernel metapackages were manually removed.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53108
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro: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"]
Threat ID: 6a5a012b91ae9bcd3f801516
Added to database: 07/17/2026, 10:17:15 UTC
Last enriched: 09/07/2026, 22:45:01 UTC
Last updated: 09/11/2026, 07:31:54 UTC
Views: 20
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