Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: KVM: guest_memfd: Treat memslot binding offset+size as unsigned values When… (CVE-2026-64283)
A vulnerability in the Linux kernel's KVM subsystem related to guest_memfd handling has been resolved. The issue involved treating memslot binding offset and size as signed values instead of unsigned, which could cause incorrect overflow checks. This flaw could potentially lead to memory safety issues. The vulnerability has a CVSS score of 7.0 and affects multiple versions of the linux-hwe-edge kernel prior to specific 7.0.0 package versions. Official patches are available and should be applied to mitigate the risk.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-64283) in the Linux kernel KVM guest_memfd subsystem was due to treating the offset and size of memslot bindings as signed values rather than unsigned 64-bit values. This caused incorrect overflow checks when summing offset and size, potentially allowing memory safety violations. The flaw was fixed by correctly treating these values as unsigned, aligning with their intended representation on 64-bit kernels. The issue affects linux-hwe-edge kernel versions prior to 7.0.0-31.31 and related builds. The vulnerability has a CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a medium severity local attack requiring low privileges and high complexity. Official Ubuntu security advisories USN-8726-1 and USN-8727-1 provide patches and recommend updating to fixed kernel versions.
Potential Impact
If unpatched, a local attacker with low privileges could exploit this vulnerability to cause memory corruption or bypass memory protection mechanisms, potentially leading to privilege escalation or system compromise. The CVSS score reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and has high attack complexity.
Mitigation Recommendations
A fix is available and has been released by Ubuntu in updated linux-hwe-edge kernel packages. Users should apply the official security updates and reboot their systems to ensure the vulnerability is remediated. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary after updating. Follow the Ubuntu security notices USN-8726-1 and USN-8727-1 for detailed update instructions.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: KVM: guest_memfd: Treat memslot binding offset+size as unsigned values When… (CVE-2026-64283)
Description
A vulnerability in the Linux kernel's KVM subsystem related to guest_memfd handling has been resolved. The issue involved treating memslot binding offset and size as signed values instead of unsigned, which could cause incorrect overflow checks. This flaw could potentially lead to memory safety issues. The vulnerability has a CVSS score of 7.0 and affects multiple versions of the linux-hwe-edge kernel prior to specific 7.0.0 package versions. Official patches are available and should be applied to mitigate the risk.
CVSS v3.1
Score 7.0high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-64283) in the Linux kernel KVM guest_memfd subsystem was due to treating the offset and size of memslot bindings as signed values rather than unsigned 64-bit values. This caused incorrect overflow checks when summing offset and size, potentially allowing memory safety violations. The flaw was fixed by correctly treating these values as unsigned, aligning with their intended representation on 64-bit kernels. The issue affects linux-hwe-edge kernel versions prior to 7.0.0-31.31 and related builds. The vulnerability has a CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a medium severity local attack requiring low privileges and high complexity. Official Ubuntu security advisories USN-8726-1 and USN-8727-1 provide patches and recommend updating to fixed kernel versions.
Potential Impact
If unpatched, a local attacker with low privileges could exploit this vulnerability to cause memory corruption or bypass memory protection mechanisms, potentially leading to privilege escalation or system compromise. The CVSS score reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and has high attack complexity.
Mitigation Recommendations
A fix is available and has been released by Ubuntu in updated linux-hwe-edge kernel packages. Users should apply the official security updates and reboot their systems to ensure the vulnerability is remediated. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary after updating. Follow the Ubuntu security notices USN-8726-1 and USN-8727-1 for detailed update instructions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-64fq-x7r6-wc9g
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64283"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420e9c2644c7f80865e6
Added to database: 07/25/2026, 23:09:02 UTC
Last enriched: 09/07/2026, 18:13:29 UTC
Last updated: 09/07/2026, 22:52:14 UTC
Views: 53
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