Security readout for executives and security teams
Plain-English summary
This is a Linux kernel driver reliability flaw. The Intel ice network driver could crash during removal because it tried to free an RDMA-related ID that might never have been allocated. The documented impact is a system crash during driver unload, not remote takeover.
Executive priority
Treat as a targeted stability issue, not an emergency internet-facing compromise. Patch during normal kernel maintenance, with higher priority for production hosts using affected Intel ice networking.
Technical view
The ice driver remove path freed aux_idx unconditionally. On systems where RDMA support was not initialized, that free could target an invalid allocation state and crash. The fix initializes aux_idx to an invalid value and frees it only when valid.
Likely exposure
Exposure appears limited to Linux systems using affected 5.14 or 5.15-era kernels with the ice driver. Systems without Intel ice-supported networking hardware are unlikely to be affected based on the source description.
Exploitation context
The provided sources do not report active exploitation, KEV listing, exploit code, or remote attack conditions. The described trigger is driver unload/removal on systems where RDMA support was not initialized.
Researcher notes
Evidence is limited to the CVE description and kernel stable references. No CVSS, CWE, exploitability assessment, or distribution-specific affected package matrix is provided in the bundle.
Mitigation direction
- Update to a kernel build containing the referenced stable fixes.
- Check Linux distribution advisories for backported ice driver fixes.
- Prioritize hosts using Intel ice-supported network adapters.
- Avoid unnecessary driver unloads on affected production systems until patched.
Validation and detection
- Inventory Linux kernel versions against the affected 5.14 and 5.15 ranges.
- Identify hosts loading or packaging the ice network driver.
- Review kernel logs for crashes during ice driver removal or unload.
- Confirm vendor kernel changelogs include the referenced stable commits.
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-2021-47453 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/777682e59840e24e6c5672197e6ffbcf4bff823bCVE reference, Linux
- https://git.kernel.org/stable/c/73e30a62b19b9fbb4e6a3465c59da186630d5f2eCVE 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.