UBUNTU-CVE-2022-26356

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UBUNTU-CVE-2022-26356

Summary:

Details: 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://ubuntu.com/security/CVE-2022-26356, https://xenbits.xen.org/xsa/advisory-397.html, 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.cve.org/CVERecord?id=CVE-2022-26356