Security readout for executives and security teams
Plain-English summary
CVE-2021-47009 is a Linux kernel memory leak in trusted key handling. The public record says two error paths failed to free an allocated object. Evidence does not show active exploitation, CVSS, or business-impact detail, so treat it as a kernel maintenance issue unless affected trusted-key functionality is important in your environment.
Executive priority
Handle through normal kernel patch management. Escalate only if critical systems run affected kernels and use trusted-key functionality, or if a vendor advisory later assigns higher severity or exploitation evidence.
Technical view
The issue is in security/keys/trusted-keys/trusted_tpm1.c, where error returns neglected to free object td. Kernel stable commits changed those paths to use the cleanup route that securely frees td. The source bundle identifies Linux kernel versions and stable commits, but does not provide exploitability analysis or distribution package mappings.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel versions with trusted keys or TPM1 trusted-key code reachable. The provided version data lists Linux 5.10.38, 5.11.22, 5.12, 5.12.5, and 5.13, but exact downstream distro exposure requires vendor mapping.
Exploitation context
The sources describe a memory leak found by clang scan-build and fixed in stable kernel commits. They do not cite public exploitation, KEV listing, exploit maturity, required privileges, or attack path. Do not assume active exploitation from this bundle.
Researcher notes
The record is narrow: a memory leak in trusted_tpm1.c error handling. It does not establish attacker control, reachable call paths, denial-of-service impact, or privilege boundaries. Validation should focus on kernel version, enabled trusted-key configuration, and whether downstream packages include the stable commits.
Mitigation direction
- Update affected Linux kernels to vendor builds containing the referenced stable fixes.
- Check distribution advisories for package-level mapping to CVE-2021-47009.
- Prioritize systems using trusted keys or TPM1 trusted-key functionality.
- Use standard kernel patch cadence unless vendor guidance says otherwise.
Validation and detection
- Inventory Linux kernel versions across servers, appliances, and container hosts.
- Compare kernel builds against vendor advisories and the referenced stable commits.
- Confirm whether trusted-key and TPM1 trusted-key functionality is enabled or reachable.
- Record scanner findings separately from confirmed package exposure.
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-2021-47009 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.
SSVC decision data
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/31c9a4b24d86cbb36ff0d7a085725a3b4f0138c8CVE reference, Linux
- https://git.kernel.org/stable/c/1c4031014106aff48e1e686e40101c31eab5d44cCVE reference, Linux
- https://git.kernel.org/stable/c/3e24fbd37e72e8a67b74991970fecc82d14f57afCVE reference, Linux
- https://git.kernel.org/stable/c/83a775d5f9bfda95b1c295f95a3a041a40c7f321CVE 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.