UBUNTU-CVE-2020-9391

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2020-9391
Published: 25 Feb 2020, 18:15
Last modified:24 Oct 2025, 04:48

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Feb 2020, 18:15
Published
Vulnerability first disclosed
24 Oct 2025, 04:48
Last Modified
Vulnerability information updated

Description

An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-raspi2

    all

References (6)