Vulnerability in Xen
CVE-2022-26359
IOMMU: RMRR (VT-d) and unity map (AMD-Vi) handling issues T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR") for Intel VT-d or Unity Mapping ranges for AMD-Vi. These are typically used for platform tasks such as legacy USB emulation. Since the precise purpose of these regions is unknown, once a device associated with such a region is active, the mappings of these regions need to remain continuouly accessible by the device. This requirement has been violated. Subsequent DMA or interrupts from the device may have unpredictable behaviour, ranging from IOMMU faults to memory corruption.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (26.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Xen — versions consult Xen advisory XSA-400
- Debian Linux — versions 11.0
- Fedoraproject Fedora — versions 34, 35
Public proof-of-concept exploits
References
- xenbits.xenproject.org/xsa/advisory-400.txt (Vendor Advisory)
- xenbits.xen.org/xsa/advisory-400.html (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2022/04/05/3 (mailing-list, Patch, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5117 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202402-07 (vendor-advisory)
Frequently asked questions
- What is CVE-2022-26359?
- CVE-2022-26359 is a high-severity vulnerability in Xen. CVSS score: 7.8/10. Published 2022-04-05.
- How severe is CVE-2022-26359?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2022-26359 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.