Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: lib: test_hmm: evict device pages on file close to avoid use-after-free Patch… (CVE-2026-46280)
A use-after-free vulnerability in the Linux kernel's heterogeneous memory management (HMM) selftests was fixed. The flaw occurred because device private pages were not migrated back to system memory before freeing a structure, leaving dangling pointers that could cause kernel panic during subsequent faults. This issue was reported during testing on ARM64 architectures. The vulnerability has a CVSS score of 7.8 and affects numerous Linux kernel versions prior to 7.0.0-27.27. A patch is available and included in recent Linux kernel updates.
AI Analysis
Technical Summary
CVE-2026-46280 addresses a use-after-free vulnerability in the Linux kernel's HMM selftests, specifically in the dmirror_fops_release() function. When this function frees the dmirror struct without migrating device private pages back to system memory, the pages retain stale pointers to freed memory. Subsequent faults on these pages, such as during a coredump, cause dereferencing of invalid pointers leading to kernel panic. The issue was identified during execution of mm/ksft_hmm.sh on ARM64. The patch fixes this by ensuring device private pages are evicted properly before freeing the structure.
Potential Impact
Exploitation of this vulnerability can cause a kernel panic, resulting in denial of service. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, exploitation requires local access with low privileges and no user interaction. There are no known exploits in the wild. The vulnerability affects system stability and could disrupt operations on affected Linux kernel versions.
Mitigation Recommendations
A patch is available and included in Linux kernel versions 7.0.0-27.27 and later. Users should update their Linux kernel to the fixed versions provided by their distribution. After updating, a system reboot is required to apply the changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. Follow vendor instructions for updating and rebuilding modules as needed.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: lib: test_hmm: evict device pages on file close to avoid use-after-free Patch… (CVE-2026-46280)
Description
A use-after-free vulnerability in the Linux kernel's heterogeneous memory management (HMM) selftests was fixed. The flaw occurred because device private pages were not migrated back to system memory before freeing a structure, leaving dangling pointers that could cause kernel panic during subsequent faults. This issue was reported during testing on ARM64 architectures. The vulnerability has a CVSS score of 7.8 and affects numerous Linux kernel versions prior to 7.0.0-27.27. A patch is available and included in recent Linux kernel updates.
CVSS v3.1
Score 7.8high
Affected software
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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=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=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? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46280 addresses a use-after-free vulnerability in the Linux kernel's HMM selftests, specifically in the dmirror_fops_release() function. When this function frees the dmirror struct without migrating device private pages back to system memory, the pages retain stale pointers to freed memory. Subsequent faults on these pages, such as during a coredump, cause dereferencing of invalid pointers leading to kernel panic. The issue was identified during execution of mm/ksft_hmm.sh on ARM64. The patch fixes this by ensuring device private pages are evicted properly before freeing the structure.
Potential Impact
Exploitation of this vulnerability can cause a kernel panic, resulting in denial of service. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, exploitation requires local access with low privileges and no user interaction. There are no known exploits in the wild. The vulnerability affects system stability and could disrupt operations on affected Linux kernel versions.
Mitigation Recommendations
A patch is available and included in Linux kernel versions 7.0.0-27.27 and later. Users should update their Linux kernel to the fixed versions provided by their distribution. After updating, a system reboot is required to apply the changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. Follow vendor instructions for updating and rebuilding modules as needed.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46280
- 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"]
- Cvss Version
- 3.1
Threat ID: 6a5a019a91ae9bcd3f8055ea
Added to database: 07/17/2026, 10:19:06 UTC
Last enriched: 09/08/2026, 00:04:39 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 24
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