NULL pointer dereference in Xen
CVE-2022-42335
x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Due to too lax a check in one of the hypervisor routines used for shadow page handling it is possible for a guest with a PCI device passed through to cause the hypervisor to access an arbitrary pointer partially under guest control.
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: 0.003 (16.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Xen — versions consult Xen advisory XSA-430, 4.17.0
- Fedoraproject Fedora — versions 38
Weakness classification (CWE)
References
- xenbits.xenproject.org/xsa/advisory-430.txt (Patch, Vendor Advisory)
- xenbits.xen.org/xsa/advisory-430.html (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2023/04/25/1 (mailing-list, Mailing List, Third Party 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-2022-42335?
- CVE-2022-42335 is a high-severity vulnerability in Xen, classified under NULL Pointer Dereference. CVSS score: 7.8/10. Published 2023-04-25.
- How severe is CVE-2022-42335?
- High severity. CVSS v3 base score is 7.8 out of 10.