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Red Hat: CVE-2018-18559: Important: kernel security, bug fix, and enhancement update (Multiple Advisories)

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Red Hat: CVE-2018-18559: Important: kernel security, bug fix, and enhancement update (Multiple Advisories)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
10/22/2018
Created
03/19/2019
Added
01/30/2019
Modified
03/03/2021

Description

In the Linux kernel through 4.19, a use-after-free can occur due to a race condition between fanout_add from setsockopt and bind on an AF_PACKET socket. This issue exists because of the 15fe076edea787807a7cdc168df832544b58eba6 incomplete fix for a race condition. The code mishandles a certain multithreaded case involving a packet_do_bind unregister action followed by a packet_notifier register action. Later, packet_release operates on only one of the two applicable linked lists. The attacker can achieve Program Counter control.

Solution(s)

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

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