**Issue Overview:**
\- Microarchitectural Store Buffer Data Sampling (MSBDS) (CVE-2018-12126)
\- Microarchitectural Fill Buffer Data Sampling (MFBDS) (CVE-2018-12130)
\- Microarchitectural Load Port Data Sampling (MLPDS) (CVE-2018-12127)
\- Microarchitectural Data Sampling Uncacheable Memory (MDSUM) (CVE-2019-11091)
MSBDS leaks Store Buffer Entries which can be speculatively forwarded to a dependent load (store-to-load forwarding) as an optimization. The forward can also happen to a faulting or assisting load operation for a different memory address, which can cause an issue under certain conditions. Store buffers are partitioned between Hyper-Threads so cross thread forwarding is not possible. But if a thread enters or exits a sleep state the store buffer is repartitioned which can expose data from one thread to the other.
MFBDS leaks Fill Buffer Entries. Fill buffers are used internally to manage L1 miss situations and to hold data which is returned or sent in response to a memory or I/O operation. Fill buffers can forward data to a load operation and also write data to the cache. When the fill buffer is deallocated it can retain the stale data of the preceding operations which can then be forwarded to a faulting or assisting load operation, which can cause an issue under certain conditions. Fill buffers are shared between Hyper-Threads so cross thread leakage is possible.
MLDPS leaks Load Port Data. Load ports are used to perform load operations from memory or I/O. The received data is then forwarded to the register file or a subsequent operation. In some implementations the Load Port can contain stale data from a previous operation which can be forwarded to faulting or assisting loads under certain conditions, which again can cause an issue eventually. Load ports are shared between Hyper-Threads so cross thread leakage is possible.
**Affected Packages:**
kernel
**Issue Correction:**
Run _yum update kernel_ and reboot your instance to update your system.
**New Packages:**
i686:
kernel-tools-devel-4.14.114-83.126.amzn1.i686
kernel-headers-4.14.114-83.126.amzn1.i686
kernel-tools-4.14.114-83.126.amzn1.i686
perf-debuginfo-4.14.114-83.126.amzn1.i686
kernel-tools-debuginfo-4.14.114-83.126.amzn1.i686
kernel-debuginfo-common-i686-4.14.114-83.126.amzn1.i686
kernel-devel-4.14.114-83.126.amzn1.i686
kernel-debuginfo-4.14.114-83.126.amzn1.i686
kernel-4.14.114-83.126.amzn1.i686
perf-4.14.114-83.126.amzn1.i686
src:
kernel-4.14.114-83.126.amzn1.src
x86_64:
kernel-debuginfo-4.14.114-83.126.amzn1.x86_64
kernel-devel-4.14.114-83.126.amzn1.x86_64
kernel-debuginfo-common-x86_64-4.14.114-83.126.amzn1.x86_64
kernel-headers-4.14.114-83.126.amzn1.x86_64
perf-4.14.114-83.126.amzn1.x86_64
perf-debuginfo-4.14.114-83.126.amzn1.x86_64
kernel-tools-devel-4.14.114-83.126.amzn1.x86_64
kernel-tools-4.14.114-83.126.amzn1.x86_64
kernel-tools-debuginfo-4.14.114-83.126.amzn1.x86_64
kernel-4.14.114-83.126.amzn1.x86_64
### Additional References
Red Hat: [CVE-2018-12126](<https://access.redhat.com/security/cve/CVE-2018-12126>), [CVE-2018-12127](<https://access.redhat.com/security/cve/CVE-2018-12127>), [CVE-2018-12130](<https://access.redhat.com/security/cve/CVE-2018-12130>), [CVE-2019-11091](<https://access.redhat.com/security/cve/CVE-2019-11091>)
Mitre: [CVE-2018-12126](<https://vulners.com/cve/CVE-2018-12126>), [CVE-2018-12127](<https://vulners.com/cve/CVE-2018-12127>), [CVE-2018-12130](<https://vulners.com/cve/CVE-2018-12130>), [CVE-2019-11091](<https://vulners.com/cve/CVE-2019-11091>)
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