CVE-2022-26356

Description

Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XEN_DMOP_track_dirty_vram (was named HVMOP_track_dirty_vram before Xen 4.9) is racy with ongoing log dirty hypercalls. A suitably timed call to XEN_DMOP_track_dirty_vram can enable log dirty while another CPU is still in the process of tearing down the structures related to a previously enabled log dirty mode (XEN_DOMCTL_SHADOW_OP_OFF). This is due to lack of mutually exclusive locking between both operations and can lead to entries being added in already freed slots, resulting in a memory leak.

References

https://xenbits.xenproject.org/xsa/advisory-397.txt

http://xenbits.xen.org/xsa/advisory-397.html

http://www.openwall.com/lists/oss-security/2022/04/05/1

https://www.debian.org/security/2022/dsa-5117

https://lists.fedoraproject.org/archives/list/[email protected]/message/UHFSRVLM2JUCPDC2KGB7ETPQYJLCGBLD/

https://lists.fedoraproject.org/archives/list/[email protected]/message/6ETPM2OVZZ6KOS2L7QO7SIW6XWT5OW3F/

Details

Risk Information

CVSS v2

CVSS v3