MEDIUM 4.7 Microsoft
CVE-2018-5407
Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.
Microsoft Security Update 2026-Aug: Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.
Affected Products
- cbl2 shim-unsigned-aarch64 15-5 on CBL Mariner 2.0
- azl3 shim-unsigned-x64 16.1-1 on Azure Linux 3.0
- azl3 shim-unsigned-aarch64 16.1-2 on Azure Linux 3.0
- azl3 shim-unsigned-x64 16.1-2 on Azure Linux 3.0
- cbl2 shim-unsigned-aarch64 15-5
- cbl2 shim-unsigned-x64 15.8-1
- cbl2 shim-unsigned-x64 15.8-1 on CBL Mariner 2.0
- azl3 shim-unsigned-aarch64 16.1-1 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-5407
- https://nvd.nist.gov/vuln/detail/CVE-2018-5407
This medium severity vulnerability with a CVSS score of 4.7 was published on 2026-08-06 via Microsoft. Affected: cbl2 shim-unsigned-aarch64 15-5 on CBL Mariner 2.0, azl3 shim-unsigned-x64 16.1-1 on Azure Linux 3.0, azl3 shim-unsigned-aarch64 16.1-2 on Azure Linux 3.0 and 5 more.
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