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Red Hat OpenShift: CVE-2020-12826: kernel: possible to send arbitrary signals to a privileged (suidroot) parent process

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Red Hat OpenShift: CVE-2020-12826: kernel: possible to send arbitrary signals to a privileged (suidroot) parent process

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/12/2020
Created
03/13/2021
Added
03/12/2021
Modified
03/12/2021

Description

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

Solution(s)

  • linuxrpm-upgrade-redhat-coreos

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