Security readout for executives and security teams
Plain-English summary
CVE-2020-14381 is a local Linux kernel privilege-escalation flaw in futex handling. An attacker who already has local access could corrupt memory or gain higher privileges when a futex is created on a filesystem being unmounted. It is serious for multi-user, shared-hosting, and container-dense systems.
Executive priority
Treat as high priority for shared Linux infrastructure because successful exploitation could turn limited local access into full system compromise. Internet exposure alone is not the trigger; local code execution paths and tenant density drive urgency.
Technical view
The issue is described as a CWE-416 use-after-free in the Linux kernel futex implementation. The CVSS 3.1 score is 7.8, with local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
The source bundle names Linux kernel 5.6-rc6 as affected. Real exposure depends on distribution backports and vendor kernel builds, which are not fully enumerated in the provided evidence.
Exploitation context
No CISA KEV listing is provided, and the source bundle does not state active exploitation. The attack requires local privileges, so risk is highest where untrusted users, tenants, workloads, or compromised accounts can run code.
Researcher notes
The provided evidence supports local privilege escalation and memory corruption via futex handling during filesystem unmount activity. The exact affected downstream distro versions and complete fixed-version matrix are not present, so validation should rely on vendor advisories and package metadata.
Mitigation direction
- Check vendor advisories for CVE-2020-14381 coverage in your Linux distribution.
- Apply vendor-supported kernel updates containing the upstream futex fix.
- Reboot systems so the patched kernel is actually running.
- Reduce local shell and workload access on high-value shared systems.
- Prioritize multi-user, hosting, CI, and container worker nodes.
Validation and detection
- Inventory running kernel versions across Linux fleets.
- Map each kernel package to vendor advisories for CVE-2020-14381.
- Confirm the running kernel changed after reboot or live patching.
- Review whether untrusted local users or workloads exist on affected hosts.
- Document exceptions where vendor guidance is unavailable or inconclusive.
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.
CWE-416: 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-2020-14381 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1874311CVE reference · x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8019ad13ef7f64be44d4f892af9c840179009254CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.