Resource Exhaustion Affecting kernel-rt-kvm package, versions <0:4.18.0-80.4.2.rt9.152.el8_0


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
97.38% (100th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTKVM-3409740
  • published26 Jul 2021
  • disclosed17 Jun 2019

Introduced: 17 Jun 2019

CVE-2019-11479  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-kvm to version 0:4.18.0-80.4.2.rt9.152.el8_0 or higher.
This issue was patched in RHSA-2019:1480.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

References

CVSS Scores

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