Security readout for executives and security teams
Plain-English summary
CVE-2020-35519 is a Linux kernel memory-safety flaw in the X.25 bind handling path. A local user account could trigger out-of-bounds kernel memory access, potentially causing a crash or exposing internal kernel information. The source bundle does not provide CVSS scoring or confirmed exploitation.
Executive priority
Treat this as a moderate operational risk where local users exist on affected systems. Prioritize shared servers, multi-user environments, and appliances using vendor-managed kernels. Escalate if vendor guidance confirms broader product exposure.
Technical view
The flaw is described as an out-of-bounds memory access in x25_bind within net/x25/af_x25.c in Linux kernel v5.12-rc5. The issue is associated with CWE-125 and a bounds check failure. Reported impacts include kernel information exposure and system crash, with source text also citing confidentiality, integrity, and availability risk.
Likely exposure
Exposure appears limited to systems running the identified Linux kernel v5.12-rc5 with relevant X.25 kernel functionality reachable by local users. The bundle includes a NetApp advisory reference, but no specific affected NetApp versions are provided here.
Exploitation context
The available evidence describes a local attack requiring a user account on the system. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation or public weaponization.
Researcher notes
Evidence is narrow: Linux kernel v5.12-rc5, x25_bind, CWE-125, local user prerequisite, and crash or kernel information leak outcomes. No CVSS vector, patch commit, or detailed product matrix is included in the supplied bundle.
Mitigation direction
- Inventory Linux hosts for kernel version v5.12-rc5.
- Check distribution, Red Hat, and vendor advisories for fixed kernel packages.
- Apply vendor-approved kernel updates or workarounds when available.
- Restrict local account access to trusted users until remediation is confirmed.
Validation and detection
- Confirm running kernel versions on in-scope Linux systems.
- Review whether X.25 kernel functionality is enabled or reachable.
- Check vendor advisories for affected product and package status.
- Verify remediation by confirming the fixed or non-affected kernel version.
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.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-35519 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://bugzilla.redhat.com/show_bug.cgi?id=1908251CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210618-0009/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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.