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Vulnerability · Published Apr 5, 2022 · Assigned by XEN

CVE-2022-26356

Medium 5.6

In plain English

A medium-severity security flaw in xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.6Medium
Exploit odds (30 days)0.2%top 84.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20xen4.16.1-r0ALPINE-CVE-2022-26356
Alpine:v3.21xen4.16.1-r0ALPINE-CVE-2022-26356
Alpine:v3.22xen4.16.1-r0ALPINE-CVE-2022-26356
Alpine:v3.23xen4.16.1-r0ALPINE-CVE-2022-26356
Alpine:v3.24xen4.16.1-r0ALPINE-CVE-2022-26356
Debian:12xen4.16.1-1DEBIAN-CVE-2022-26356
Debian:13xen4.16.1-1DEBIAN-CVE-2022-26356
Debian:14xen4.16.1-1DEBIAN-CVE-2022-26356
Ubuntu:22.04:LTSxenno fix listedUBUNTU-CVE-2022-26356
Ubuntu:24.04:LTSxenno fix listedUBUNTU-CVE-2022-26356
Ubuntu:25.10xenno fix listedUBUNTU-CVE-2022-26356
Ubuntu:26.04:LTSxenno fix listedUBUNTU-CVE-2022-26356
Ubuntu:26.10xenno fix listedUBUNTU-CVE-2022-26356

Affected products (as reported)

VendorProductVersions
Xen xen see references

References