Security readout for executives and security teams
Plain-English summary
This vulnerability affects environments using the pam_setquota module before 2020-05-29. A local user may be able to set their disk quota on an unintended filesystem when their home directory is a FUSE filesystem mounted under /home. The evidence points to a constrained local issue, not a remote compromise path.
Executive priority
Treat this as a configuration-dependent local hardening issue. Prioritize multi-user Linux systems, shared hosting, research clusters, or environments with FUSE-backed home directories. It is lower urgency than remotely exploitable issues, but should be closed during normal patch and configuration review cycles.
Technical view
pam_setquota.c did not correctly constrain quota-setting to the intended filesystem in a specific FUSE home-directory scenario. A local attacker with a home directory mounted as FUSE under /home could set quota data on an arbitrary filesystem. The provided sources do not include CVSS, CWE, affected package versions, or detailed patch identifiers.
Likely exposure
Exposure is likely limited to Linux systems that use pam_setquota, allow local user access, and have FUSE-mounted home directories under /home. Systems not using pam_setquota or not using this home-directory pattern are less likely to be affected based on the provided description.
Exploitation context
The source bundle does not cite active exploitation, public exploit use, or KEV inclusion. The vulnerability requires local access and a specific filesystem arrangement, so exploitation depends heavily on host configuration and whether untrusted users can authenticate locally.
Researcher notes
The public record is sparse: no CVSS, CWE, affected CPEs, or exploit status are provided in the bundle. The core evidence is the oss-sec reference and CVE description. Validate exposure by confirming pam_setquota use, local user trust boundaries, FUSE home mounts, and vendor package lineage.
Mitigation direction
- Check vendor guidance for pam_setquota fixes from 2020-05-29 or later.
- Update Linux-PAM or pam_setquota packages through supported vendor channels.
- Remove pam_setquota from PAM stacks where quota management is unnecessary.
- Review use of FUSE-mounted home directories under /home.
- Limit local shell access to trusted users where possible.
Validation and detection
- Inventory systems using pam_setquota in PAM configuration.
- Confirm installed pam_setquota source or package includes fixes after 2020-05-29.
- Identify hosts with FUSE-mounted home directories under /home.
- Determine whether untrusted local users can authenticate to those hosts.
- Check vendor advisories for distribution-specific affected versions.
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-2020-36394 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://seclists.org/oss-sec/2020/q2/169CVE 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.