CVE-2020-15564: debian debian_linux
Vulnerability summary
CVE-2020-15564 is a medium (CVSS 6.5) vulnerability in debian debian_linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities.
Not severe (CVSS 6.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 07-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Xen through 4.13.x, allowing Arm guest OS users to cause a hypervisor crash because of a missing alignment check in VCPUOP_register_vcpu_info. The hypercall VCPUOP_register_vcpu_info is used by a guest to register a shared region with the hypervisor. The region will be mapped into Xen address space so it can be directly accessed. On Arm, the region is accessed with instructions that require a specific alignment. Unfortunately, there is no check that the address provided by the guest will be correctly aligned. As a result, a malicious guest could cause a hypervisor crash by passing a misaligned address. A malicious guest administrator may cause a hypervisor crash, resulting in a Denial of Service (DoS). All Xen versions are vulnerable. Only Arm systems are vulnerable. x86 systems are not affected.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.40% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- xen< 4.11.4+24-gddaaccbbab-1
- debian_linuxEOL10.0
Alpine1 product
- xen≥ 4.8.0, < 4.12.3-r2 | ≥ 4.8.0, < 4.13.1-r2 | ≥ 4.8.0, < 4.13.1-r4 | ≥ 4.8.0, < 4.11.4-r0
Fedoraproject1 product
- fedoraEOL31 | 32
Ubuntu1 product
- xenAll versions (No fix recorded) | < 4.11.3+24-g14b62ab3e5-1ubuntu2.3
Xen1 product
- xen≥ 4.8.0, ≤ 4.13.1
5 vendors · 6 products
References
12 links- www.openwall.com/lists/oss-security/2020/07/07/5Mailing ListX Refsource MLISTREPORTPatchThird Party Advisory
