Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can let a local attacker read memory contents through the /proc pid syscall interface. It is not a remote takeover issue, but it matters on shared Linux systems, build hosts, developer workstations, and container platforms where untrusted users can run code.
Executive priority
Treat this as a moderate-priority Linux fleet hygiene issue. It is not described as remotely exploitable, but it can expose sensitive memory on affected shared systems and should be folded into kernel patching and hardening work.
Technical view
CVE-2020-28588 is an information disclosure flaw in Linux Kernel /proc/pid/syscall functionality. Sources say it was introduced in v5.1-rc4 and remained present through v5.10-rc4, likely affecting versions between. Reading /proc/pid/syscall can trigger leakage of kernel memory contents. CVSS is 4.0, local, low complexity, no privileges, confidentiality impact only.
Likely exposure
Exposure is most relevant where affected Linux kernel versions are used and untrusted local users, workloads, or containers can access procfs. Single-purpose systems with no local untrusted execution have lower practical risk.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked KEV. Exploitation requires local access, but the CVSS vector indicates no privileges and no user interaction are required once local execution is available.
Researcher notes
Evidence is limited to public CVE metadata and Talos reporting referenced in the bundle. The source describes affected upstream versions and the vulnerable procfs functionality, but the bundle does not name a specific fixed version, workaround, or observed exploitation.
Mitigation direction
- Inventory Linux systems running kernels from v5.1-rc4 through v5.10-rc4.
- Check Linux distribution or kernel vendor guidance for fixed packages or backports.
- Prioritize shared hosts, CI runners, developer machines, and container infrastructure.
- Limit untrusted local shell, workload, or container access on affected systems.
- Apply vendor-supported kernel updates after testing.
Validation and detection
- Confirm kernel versions against the affected range in the CVE sources.
- Review distribution advisories for whether fixes were backported to installed packages.
- Identify systems where untrusted users or workloads can access procfs.
- Confirm whether /proc pid syscall exposure matches local hardening policy.
- Document compensating controls where patching cannot happen immediately.
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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CWE-681: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-28588 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
- Medium
- CVSS
- 4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N2.51.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4MediumVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1211CVE reference · x_refsource_MISC
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.
Incorrect Conversion between Numeric Types
Incorrect Conversion between Numeric Types represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.