CVE-2022-26363

published 2022-06-09

CVE-2022-26363: x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities…

Priority P4 27 medium 6.7 CVSS 3.1

AV L AC L PR H UI N S U C H I H A H

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

8 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	xen	< xen 4.16.2-1 (bookworm)	xen 4.16.2-1 (bookworm)
fedoraproject	fedora	—	—
fedoraproject	fedora	—	—
xen	xen	>= 0 < 4.14.5+24-g87d90d511c-1	4.14.5+24-g87d90d511c-1
xen	xen	>= 0 < 4.16.2-1	4.16.2-1
xen	xen	>= 0 < 4.16.2-1	4.16.2-1
xen	xen	>= 0 < 4.16.2-1	4.16.2-1

CVSS provenance

nvd v3.1 6.7 MEDIUM CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.2 HIGH AV:L/AC:L/Au:N/C:C/I:C/A:C

osv 6.7 MEDIUM

vendor_debian 6.7 MEDIUM

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