MNBSD-2021-3: Xen grant-mapping error handling resource leak

Description

Improper error handling in the Xen grant-mapping operations of the blkfront/netfront paths could allow a malicious or buggy frontend driver to cause resource leaks in the domain running the corresponding backend driver, and to unmap memory incorrectly when errors occur.

Affected Versions

kernel

Recommendations

No specific recommendations provided.

References

• https://www.freebsd.org/security/advisories/FreeBSD-SA-21:06.xen.asc
• https://www.cve.org/CVERecord?id=CVE-2021-26932

Additional Information

Aliases: CVE-2021-26932

Published: February 24, 2021
Last Modified: February 24, 2021