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Red Hat: CVE-2019-11479: excessive resource consumption for TCP connections with low MSS allows remote denial of service (Multiple Advisories)

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Red Hat: CVE-2019-11479: excessive resource consumption for TCP connections with low MSS allows remote denial of service (Multiple Advisories)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
06/17/2019
Created
06/19/2019
Added
06/18/2019
Modified
03/13/2024

Description

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.

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • 108818
  • 905115
  • CVE-2019-11479
  • RHSA-2019:1479
  • RHSA-2019:1480
  • RHSA-2019:1481
  • RHSA-2019:1482
  • RHSA-2019:1483
  • RHSA-2019:1486
  • RHSA-2019:1594
  • RHSA-2019:1602
  • RHSA-2019:1699
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