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Race Condition Affecting kernel-debuginfo package, versions <0:4.14.209-160.335.amzn2

Severity

 Recommended
high

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    0.05% (16th percentile)

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  • Snyk ID SNYK-AMZN2-KERNELDEBUGINFO-1691959
  • published 27 Sep 2021
  • disclosed 22 Oct 2020
Report a new vulnerability Found a mistake?

Introduced: 22 Oct 2020

CVE-2020-27675 Open this link in a new tab
CWE-362 Open this link in a new tab
CWE-476 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 kernel-debuginfo to version 0:4.14.209-160.335.amzn2 or higher.
This issue was patched in ALAS2-2020-1566.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.

References

CVSS Scores

version 3.1
Expand this section

NVD

4.7 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
Expand this section

SUSE

6.2 medium