Vulnerability · Published Jun 9, 2022 · Assigned by XEN
CVE-2022-26363
Medium 6.7
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 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.16.1-r2 | ALPINE-CVE-2022-26363 |
| Alpine:v3.21 | xen | 4.16.1-r2 | ALPINE-CVE-2022-26363 |
| Alpine:v3.22 | xen | 4.16.1-r2 | ALPINE-CVE-2022-26363 |
| Alpine:v3.23 | xen | 4.16.1-r2 | ALPINE-CVE-2022-26363 |
| Alpine:v3.24 | xen | 4.16.1-r2 | ALPINE-CVE-2022-26363 |
| Debian:12 | xen | 4.16.2-1 | DEBIAN-CVE-2022-26363 |
| Debian:13 | xen | 4.16.2-1 | DEBIAN-CVE-2022-26363 |
| Debian:14 | xen | 4.16.2-1 | DEBIAN-CVE-2022-26363 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-26363 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-26363 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2022-26363 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2022-26363 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2022-26363 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-402.txt x_refsource_MISC
- http://xenbits.xen.org/xsa/advisory-402.html x_refsource_CONFIRM
- [oss-security] 20220609 Xen Security Advisory 402 v4 (CVE-2022-26363,CVE-2022-26364) - x86 pv: Insufficient care with non-coherent mappings mailing-list, x_refsource_MLIST
- FEDORA-2022-0142d562ca vendor-advisory, x_refsource_FEDORA
- DSA-5184 vendor-advisory, x_refsource_DEBIAN
- FEDORA-2022-2c9f8224f8 vendor-advisory, x_refsource_FEDORA
- GLSA-202208-23 vendor-advisory, x_refsource_GENTOO