Access Restriction Bypass Affecting torvalds/linux package, versions [,4.16)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.07% (34th percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3004714
  • published26 Jan 2022
  • disclosed15 May 2018
  • creditUnknown

Introduced: 15 May 2018

CVE-2018-1087  (opens in a new tab)
CWE-264  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 4.16 or higher.

Overview

Affected versions of this package are vulnerable to Access Restriction Bypass 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.

CVSS Base Scores

version 3.1