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CVE-2020-12826

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4391-1
Posted Jun 10, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4391-1 - It was discovered that the ext4 file system implementation in the Linux kernel did not properly handle setxattr operations in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-19319, CVE-2020-0543, CVE-2020-10751, CVE-2020-12114, CVE-2020-12464, CVE-2020-12769, CVE-2020-12826, CVE-2020-1749
MD5 | b9a5c4d0b8f881b21288f5e8a866b693
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