Use After Free Affecting kernel-bootwrapper package, versions <0:3.10.0-693.47.2.el7
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Test your applications- Snyk ID SNYK-RHEL7-KERNELBOOTWRAPPER-4827370
- published 26 Jul 2021
- disclosed 15 Jun 2018
Introduced: 15 Jun 2018
CVE-2018-18559 Open this link in a new tabHow to fix?
Upgrade RHEL:7 kernel-bootwrapper to version 0:3.10.0-693.47.2.el7 or higher.
This issue was patched in RHSA-2019:1170.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-bootwrapper package and not the kernel-bootwrapper package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.