CVE-2020-12826: canonical ubuntu_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2020-12826 is a medium (CVSS 5.3) Integer Overflow or Wraparound vulnerability in canonical ubuntu_linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 53.4% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 12-05-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.