CVE-2022-26363: Medium severity XEN Xen vulnerability
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/xento a version that resolves this vulnerability.Fixed in 4.17.5+72-g01140da4e8-1Fixed in 4.17.7-0+deb12u1Fixed in 4.20.3+127-gc42374a105-0+deb13u1Fixed in 4.20.4+39-gf1e1321c87-0+deb13u1Fixed in 4.20.4+39-gf1e1321c87-1
Event History
Frequently Asked Questions
What is CVE-2022-26363?
CVE-2022-26363 is a vulnerability in Xen that allows attackers to cause a denial of service or potentially execute arbitrary code.
Which software products are affected by CVE-2022-26363?
Xen Xen, Fedoraproject Fedora 35 and 36, and Debian Debian Linux 11.0 are affected by CVE-2022-26363.
What is the severity of CVE-2022-26363?
The severity of CVE-2022-26363 is high with a CVSS score of 6.7.
How can I fix CVE-2022-26363?
To fix CVE-2022-26363, upgrade to Xen version 4.14.6-1, 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, or 4.17.2+55-g0b56bed864-1.
Where can I find more information about CVE-2022-26363?
You can find more information about CVE-2022-26363 on the Xen advisory page (https://xenbits.xen.org/xsa/advisory-402.html), Debian security tracker (https://security-tracker.debian.org/tracker/CVE-2022-26363), and the OSS security mailing list (http://www.openwall.com/lists/oss-security/2022/06/09/4).