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CVE-2018-3665

Publication date 13 June 2018

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.6 · Medium

Score breakdown

System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially allow a local process to infer data from another process through a speculative execution side channel.

From the Ubuntu Security Team

Julian Stecklina and Thomas Prescher discovered that FPU register states (such as MMX, SSE, and AVX registers) which are lazily restored are potentially vulnerable to a side channel attack. A local attacker could use this to expose sensitive information.

Read the notes from the security team

Status

Package Ubuntu Release Status
linux 18.04 LTS bionic
Not affected
17.10 artful
Not affected
16.04 LTS xenial
Fixed 4.4.0-130.156
14.04 LTS trusty
Fixed 3.13.0-153.203
linux-aws 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Fixed 4.4.0-1062.71
14.04 LTS trusty
Fixed 4.4.0-1024.25
linux-azure 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
linux-euclid 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-flo 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-gcp 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-gke 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-goldfish 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-grouper 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-hwe 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-hwe-edge 18.04 LTS bionic
Fixed 4.18.0-8.9~18.04.1
17.10 artful Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-kvm 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Fixed 4.4.0-1029.34
14.04 LTS trusty Not in release
linux-lts-trusty 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-utopic 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-vivid 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-wily 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-lts-xenial 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty
Fixed 4.4.0-130.156~14.04.1
linux-maguro 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-mako 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release
linux-manta 18.04 LTS bionic Not in release
17.10 artful Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
linux-oem 18.04 LTS bionic
Not affected
17.10 artful Not in release
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-raspi2 18.04 LTS bionic
Not affected
17.10 artful
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
linux-snapdragon 18.04 LTS bionic
Not affected
17.10 artful
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release

Notes

tyhicks

Xenial and Trusty are affected when running on older x86 processors that do not have support for the xsaveopt instruction. You can verify if your system has support for xsaveopt by locating the "xsaveopt" feature listed in the flags section of the /proc/cpuinfo file. Precise is affected on all x86 processors.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 5.6 · Medium
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3698-2
    • Linux kernel (Trusty HWE) vulnerabilities
    • 2 July 2018
    • USN-3698-1
    • Linux kernel vulnerabilities
    • 2 July 2018
    • USN-3696-2
    • Linux kernel (Xenial HWE) vulnerabilities
    • 2 July 2018
    • USN-3696-1
    • Linux kernel vulnerabilities
    • 2 July 2018

Other references