Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a resource cleanup bug. If the Freescale IFC memory controller driver fails during probing, it can leave an IO memory mapping behind. The provided sources do not show remote exposure, privilege escalation, data theft, or active exploitation.
Executive priority
Handle through routine kernel patch management unless the organization operates embedded or appliance systems using Freescale IFC hardware. There is no source-backed evidence of active exploitation, but affected devices should still receive vendor kernel updates.
Technical view
CVE-2021-47315 fixes an IO mapping leak in drivers/memory/fsl_ifc.c. On fsl_ifc_ctrl_probe() error paths, gregs was not released. The CVE record lists Linux as affected across several kernel versions and links stable kernel commits that resolve the cleanup behavior.
Likely exposure
Exposure appears limited to Linux systems using the fsl_ifc driver, typically platforms with Freescale/NXP IFC-related hardware. The issue is tied to driver probe failure paths, not a public network service. Organizations without this hardware or driver enabled are unlikely to be affected.
Exploitation context
The source bundle does not cite active exploitation, and KEV is false. No exploit method, CVSS score, or CWE is provided. Treat exploitation likelihood as unproven based on the supplied evidence.
Researcher notes
The available evidence describes a missing unmap on probe error, reported by Smatch. Impact details are sparse: no CVSS, CWE, exploit status, or explicit attack prerequisites are provided. Confirm affectedness by kernel branch, driver presence, and hardware dependency.
Mitigation direction
- Check Linux vendor advisories for kernels containing the referenced stable fixes.
- Prioritize platforms using Freescale/NXP IFC hardware or the fsl_ifc driver.
- Update affected kernels through normal vendor-supported kernel maintenance.
- If no vendor package exists, track the referenced upstream stable commits.
- Document any exception where embedded devices cannot receive kernel updates.
Validation and detection
- Inventory Linux kernel versions on systems with Freescale/NXP IFC hardware.
- Confirm whether the fsl_ifc driver is built, loaded, or required.
- Compare deployed kernels against vendor fixes or referenced stable commits.
- Review boot and kernel logs for fsl_ifc probe failures.
- Validate patched kernels in staging before production rollout.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit d0d04b95e8ed0223844a1d58497c686fe2e4a955
- Linux stable commit 6b3b002de90738e3c85853a682ce7e0fa078d42b
- Linux stable commit 94bc2fe46102d1e060fc749c0c19511e76c9995f
- Linux stable commit d9213d4f372d30b5bc4d921795d6bed0c0e3eebf
- Linux stable commit 8d071d270afba468708faca5f7b6d9e656f75e27
- Linux stable commit 83af5816308b490b05fc8fa27fc1bdc769df200a
- Linux stable commit 28f71fd81ebd3b386bf5c7c5539664156f7d72c1
- Linux stable commit 3b132ab67fc7a358fff35e808fa65d4bea452521
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-2021-47315 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/d0d04b95e8ed0223844a1d58497c686fe2e4a955CVE reference, Linux
- https://git.kernel.org/stable/c/6b3b002de90738e3c85853a682ce7e0fa078d42bCVE reference, Linux
- https://git.kernel.org/stable/c/94bc2fe46102d1e060fc749c0c19511e76c9995fCVE reference, Linux
- https://git.kernel.org/stable/c/d9213d4f372d30b5bc4d921795d6bed0c0e3eebfCVE reference, Linux
- https://git.kernel.org/stable/c/8d071d270afba468708faca5f7b6d9e656f75e27CVE reference, Linux
- https://git.kernel.org/stable/c/83af5816308b490b05fc8fa27fc1bdc769df200aCVE reference, Linux
- https://git.kernel.org/stable/c/28f71fd81ebd3b386bf5c7c5539664156f7d72c1CVE reference, Linux
- https://git.kernel.org/stable/c/3b132ab67fc7a358fff35e808fa65d4bea452521CVE reference, Linux
- https://git.kernel.org/stable/c/b7a2bcb4a3731d68f938207f75ed3e1d41774510CVE reference, CVE · x_transferred
- https://git.kernel.org/stable/c/bd051b3e184fa56eeb6276ee913ba4d48069024bCVE reference, CVE · x_transferred
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.