SB2021040777 - Use after free in Linux kernel s390 kvm
Published: April 7, 2021
Security Bulletin ID
SB2021040777
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use after free (CVE-ID: CVE-2020-36313)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to use after free error within the kvm_memslot_delete() function in virt/kvm/kvm_main.c, within the kvm_s390_get_cmma() function in arch/s390/kvm/kvm-s390.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's website.