CVE-2022-1263

Published: 8 April 2022

A NULL pointer dereference issue was found in KVM when releasing a vCPU with dirty ring support enabled. This flaw allows an unprivileged local attacker on the host to issue specific ioctl calls, causing a kernel oops condition that results in a denial of service.

From the Ubuntu Security Team

Qiuhao Li, Gaoning Pan, and Yongkang Jia discovered that the kvm implementation in the Linux kernel did not handle releasing a virtual cpu properly. A local attacker in a guest VM coud possibly use this to cause a denial of service (host system crash).

Notes

PoC in oss-security post

Priority

Medium

CVSS 3 base score: 5.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1263
• https://www.openwall.com/lists/oss-security/2022/04/07/1
• https://www.spinics.net/lists/kvm/msg273052.html
• https://ubuntu.com/security/notices/USN-5469-1
• NVD
• Launchpad
• Debian