Security readout for executives and security teams
Plain-English summary
CVE-2020-36313 is a Linux kernel KVM issue fixed before the 5.7 release. It involves KVM memory-slot handling after deletion, which could allow out-of-range access. The supplied sources do not provide CVSS, CWE, or confirmed active exploitation evidence.
Executive priority
Treat this as a targeted infrastructure hygiene item for virtualization environments, not a confirmed emergency. Prioritize patch verification where KVM is used on older Linux kernels, especially business-critical hosts.
Technical view
The flaw is in Linux KVM memslot management: after a memslot deletion, KVM could access memslot data outside the valid range. The CVE names arch/s390/kvm/kvm-s390.c, include/linux/kvm_host.h, and virt/kvm/kvm_main.c, with upstream commit 0774a964ef56 referenced.
Likely exposure
Exposure is most relevant to systems running Linux kernel KVM before 5.7. The CVE specifically identifies KVM code paths and s390-related source files. Product-level exposure beyond Linux kernel and NetApp advisory reference is not detailed in the supplied bundle.
Exploitation context
The source bundle does not show CISA KEV listing, exploit publication, or active exploitation. It also lacks CVSS details, so exploitation practicality and impact cannot be confidently rated from these sources alone.
Researcher notes
Evidence is limited to the CVE description, upstream Linux commit reference, Linux 5.7 changelog, and NetApp advisory URL. No CVSS, CWE, proof-of-concept, or KEV evidence is included in the supplied bundle.
Mitigation direction
- Upgrade affected Linux kernels using supported vendor updates.
- Confirm updates include upstream commit 0774a964ef56 or equivalent fix.
- Check NetApp and OS vendor advisories for product-specific guidance.
- Prioritize virtualization hosts running KVM on kernels before 5.7.
Validation and detection
- Inventory hosts running Linux kernels earlier than 5.7.
- Identify systems with KVM enabled or virtualization workloads present.
- Check kernel changelogs or vendor bulletins for the referenced fix.
- Review NetApp advisory applicability if NetApp products are in scope.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-36313 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0774a964ef561b7170d8d1b1bfe6f88002b6d219CVE reference · x_refsource_MISC
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210604-0005/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.