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Debian: CVE-2022-26356: xen -- security update

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Debian: CVE-2022-26356: xen -- security update

Severity
4
CVSS
(AV:L/AC:H/Au:N/C:N/I:N/A:C)
Published
04/05/2022
Created
11/04/2022
Added
11/04/2022
Modified
11/04/2022

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.

Solution(s)

  • debian-upgrade-xen

References

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