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Intel CPU Linux Kernel Vulnerabilities: Data Exposure
published 8 years ago
Summary
Intel CPU-based Linux systems are vulnerable to data exposure. A malicious process can access sensitive information from other guests or the host operating system. This affects Linux systems running on Ubuntu 16.04 and 18.04. To protect your system, update your Linux kernel to the latest version.
What to do
- Update canonical linux-azure to version 4.15.0-1021.21~16.04.1.
- Update canonical linux-gcp to version 4.15.0-1017.18~16.04.1.
- Update canonical linux-hwe to version 4.15.0-32.35~16.04.1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:16.04:LTS | canonical | linux-azure |
< 4.15.0-1021.21~16.04.1 Fix: upgrade to 4.15.0-1021.21~16.04.1
|
| Ubuntu:16.04:LTS | canonical | linux-gcp |
< 4.15.0-1017.18~16.04.1 Fix: upgrade to 4.15.0-1017.18~16.04.1
|
| Ubuntu:16.04:LTS | canonical | linux-hwe |
< 4.15.0-32.35~16.04.1 Fix: upgrade to 4.15.0-32.35~16.04.1
|
Original advisory text
linux-hwe, linux-azure, linux-gcp vulnerabilities
USN-3740-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker could use this to expose sensitive information (memory from the
kernel or other processes). (CVE-2018-3620)
Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packet fragments. A remote attacker could use this to
cause a denial of service. (CVE-2018-5391)
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker could use this to expose sensitive information (memory from the
kernel or other processes). (CVE-2018-3620)
Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packet fragments. A remote attacker could use this to
cause a denial of service. (CVE-2018-5391)
References
- https://ubuntu.com/security/notices/USN-3740-2 Vendor Advisory
- https://ubuntu.com/security/CVE-2018-3620 Third Party Advisory
- https://ubuntu.com/security/CVE-2018-3646 Third Party Advisory
- https://ubuntu.com/security/CVE-2018-5391 Third Party Advisory
Timeline
Published14 Aug 2018
Updated1 Jun 2026
First seen1 Jun 2026
Sources
USN-3740-2 · OSV
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