xen: Racy interactions between dirty vram tracking and paging log dirty hypercalls Activation of log dirty mode done by XE...
CVE-2022-26356 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-26356, released April 5, 2022. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.16.1-1 | DEBIAN-CVE-2022-26356 | Apr 5, 2022 |
| xen · Debian 13.5 (trixie) | 4.16.1-1 | DEBIAN-CVE-2022-26356 | Apr 5, 2022 |
| xen · Debian 14 | 4.16.1-1 | DEBIAN-CVE-2022-26356 | Apr 5, 2022 |
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