Buffer overflow in Xen
CVE-2020-27674
An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (27.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.1% 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
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 31, 32, 33
Weakness classification (CWE)
References
- xenbits.xen.org/xsa/advisory-286.html (Patch, Vendor Advisory)
- security.gentoo.org/glsa/202011-06 (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)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4804 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/01/19/5 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27674?
- CVE-2020-27674 is a medium-severity vulnerability in Xen, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2020-10-22.
- How severe is CVE-2020-27674?
- Medium severity. CVSS v3 base score is 5.3 out of 10.