CVE-2018-1087: canonical ubuntu_linux Execution with Unnecessary Privileges

Vulnerability summary

CVE-2018-1087 is a high (CVSS 8.0) Execution with Unnecessary Privileges vulnerability in canonical ubuntu_linux. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 54.7% of scored vulnerabilities.

Timeline

1. 15-05-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

• CWE-250Execution with Unnecessary PrivilegesThe product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.