CVE-2022-26356

2022-04-0500:00:00

XEN

www.cve.org

6.5 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

14.2%

JSON

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.

CNA Affected

[
  {
    "vendor": "Xen",
    "product": "xen",
    "versions": [
      {
        "version": "consult Xen advisory XSA-397",
        "status": "unknown"
      }
    ]
  }
]