Security readout for executives and security teams
Plain-English summary
CVE-2020-36766 is a Linux kernel information leak fixed before version 5.8.6. On specific CEC/media hardware, an unprivileged local user could receive one byte of kernel memory. The source bundle does not show remote impact, privilege escalation, active exploitation, or a CVSS score.
Executive priority
Handle through normal kernel patch management unless affected systems host untrusted local users. The known impact is limited information disclosure, but kernel memory leaks should not be ignored on shared or appliance-like systems.
Technical view
The flaw is in drivers/media/cec/core/cec-api.c. The CVE description says direct assignment of log_addrs with a hole in the struct leaks one byte of kernel memory to unprivileged users on specific hardware. The referenced Linux commit and 5.8.6 changelog identify the upstream fix path.
Likely exposure
Exposure is most likely on systems running Linux kernels before 5.8.6 with affected CEC/media hardware accessible to unprivileged local users. Vendor kernels may have backported the fix, so version alone may not prove exposure.
Exploitation context
The provided sources support local, unprivileged information disclosure only. There is no KEV listing and no cited evidence of active exploitation. The impact appears narrow because it requires specific hardware and leaks one byte per described issue.
Researcher notes
Evidence is sparse: no CVSS, CWE, affected CPEs, or exploit reporting are included. Validation should focus on kernel provenance, vendor backports, CEC hardware presence, and local user exposure rather than assuming all Linux systems are affected.
Mitigation direction
- Update to Linux kernel 5.8.6 or a vendor-supported kernel containing the fix.
- Check distribution advisories for backported fixes before relying on upstream version numbers.
- Prioritize systems with untrusted local users and CEC/media hardware exposure.
- If no vendor fix is clear, follow vendor kernel guidance before deploying workarounds.
Validation and detection
- Identify systems running kernels older than 5.8.6.
- Confirm whether vendor kernels include the referenced upstream fix commit.
- Inventory hosts with CEC/media hardware accessible to unprivileged users.
- Document any unsupported or unpatched kernels for remediation tracking.
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
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CVE-2020-36766 mapping review
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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
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.