CVE-2020-12826

 

Published at: - 12-05-2020 09:15

Last modified: - 26-10-2022 01:44

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

 

Verification logic

 

Reference

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
• https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef
• https://www.openwall.com/lists/kernel-hardening/2020/03/25/1
• https://lists.openwall.net/linux-kernel/2020/03/24/1803
• https://bugzilla.redhat.com/show_bug.cgi?id=1822077
• USN-4367-1-Third Party Advisory
• USN-4369-1-
• https://security.netapp.com/advisory/ntap-20200608-0001/
• [debian-lts-announce] 20200609 [SECURITY] [DLA 2241-1] linux security update-
• [debian-lts-announce] 20200610 [SECURITY] [DLA 2241-2] linux security update-
• USN-4391-1-

 

Keywords

NVD

 

CVE-2020-12826

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures