Security readout for executives and security teams
Plain-English summary
CVE-2021-47148 is a Linux kernel flaw in the OcteonTX2 PF network driver. A user-provided RSS context value could exceed expected bounds and cause memory corruption. The source does not provide CVSS, confirmed impact, or exploitation evidence.
Executive priority
Treat as a targeted kernel driver issue, not a broad internet-facing emergency from the available evidence. Patch affected Linux hosts during normal vulnerability remediation, with higher priority for systems using OcteonTX2 PF networking.
Technical view
The flaw is a buffer overflow in otx2_set_rxfh_context(), reached through ethtool_set_rxfh(). The CVE states *rss_context comes from the user and lacked bounds checking. Linux stable commits add bounds checking to prevent memory corruption.
Likely exposure
Exposure appears limited to Linux systems using the octeontx2-pf driver, especially kernels in the affected 5.12-era range identified by the CVE data. Systems without this driver or hardware are likely not exposed based on the source bundle.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not claim active exploitation or public exploit availability. The practical attack path and required privileges are not specified in the bundle.
Researcher notes
Evidence is sparse: no CVSS, CWE, privilege requirement, or exploit status is provided. The key fact is user-controlled rss_context reaching otx2_set_rxfh_context() without bounds checks, fixed by Linux stable commits.
Mitigation direction
- Apply a vendor kernel update containing the referenced Linux stable fix.
- Prioritize systems using OcteonTX2 PF network hardware or the octeontx2-pf driver.
- Check distribution advisories for backported fixes in supported kernels.
- If updates are delayed, follow vendor guidance for driver exposure reduction.
Validation and detection
- Inventory kernels against the CVE affected version data and vendor advisories.
- Check whether the octeontx2-pf driver is present or loaded on hosts.
- Confirm the kernel includes one of the referenced stable commits or a vendor backport.
- Record systems without OcteonTX2 PF hardware as lower-priority pending vendor confirmation.
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-2021-47148 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/389146bc6d2bbb20714d06624b74856320ce40f7CVE reference, Linux
- https://git.kernel.org/stable/c/e5cc361e21648b75f935f9571d4003aaee480214CVE 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.