Security readout for executives and security teams
Plain-English summary
This CVE is a memory leak in the Linux kernel Landlock sample sandboxer code. A local low-privileged user could trigger resource exhaustion if the vulnerable sample program is built and used. The business risk is availability disruption, not data theft or integrity compromise, based on the supplied CVSS vector.
Executive priority
Treat as a moderate availability issue. It is not evidenced as remotely exploitable or actively exploited, but systems exposing local access should validate patch status during normal kernel maintenance.
Technical view
The issue is CWE-401 in samples/landlock sandboxer.c. parse_path() allocates path_list, but an error path sets ret to 0 without freeing it. The supplied CVSS vector is local, low complexity, low privileges, no user interaction, unchanged scope, and high availability impact.
Likely exposure
Exposure appears limited to Linux environments carrying the affected samples/landlock code and actually building or using the sandboxer sample. The bundle does not show remote exposure, confidentiality impact, integrity impact, or broad default-service exposure.
Exploitation context
The source bundle does not show active exploitation, proof-of-concept activity, or CISA KEV listing. Any exploitation would require local access with low privileges and would target availability through memory leakage, not direct privilege escalation.
Researcher notes
The evidence is narrow: a Clang static analysis finding and stable Linux fix references. The record names samples/landlock, so avoid expanding scope to unrelated Landlock enforcement paths without vendor confirmation.
Mitigation direction
- Review vendor kernel guidance for the applicable fixed release or backport.
- Apply the referenced Linux stable fixes where the sample is present or used.
- Avoid deploying or running the vulnerable Landlock sample sandboxer in production workflows.
- Track distribution advisories for packaged kernel or sample-code backports.
Validation and detection
- Inventory Linux kernel versions and distribution backport status.
- Check whether samples/landlock sandboxer is built, shipped, or used locally.
- Confirm the relevant stable fix commit is present in source or vendor patches.
- Prioritize validation on systems allowing local untrusted shell access.
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-401: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-47654 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
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.
SSVC decision data
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:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/20fbf100f84b9aeb9c91421abe1927bc152bc32bCVE reference, Linux
- https://git.kernel.org/stable/c/49b0d8bf05809df5f87e5c03e26d74bdfdab4571CVE reference, Linux
- https://git.kernel.org/stable/c/017196730299ccd6eed24bbfabed8af4ffd81530CVE reference, Linux
- https://git.kernel.org/stable/c/66b513b7c64a7290c1fbb88e657f7cece992e131CVE reference, Linux
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.