Uncontrolled resource consumption in Intel SGX
Priority LOW 25CWE-400Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
Uncontrolled resource consumption in the Linux kernel drivers for Intel(R) SGX may allow an authenticated user to potentially enable denial of service via local access.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00276 20th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Intel(R) SGX | See references | — | No fix listed | CNA |
- Intel(R) SGX Vendor— Affected See references Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
Not affected: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-33135
- 2026-10-03 Alias added: GHSA-q2pr-ffxw-p47h
References
More Intel Software Guard Extensions vulnerabilities
- TI-2019-00136 Improper input validation in Intel SGX for Linux CVSS 3.0MEDIUM 5.5
- TI-2018-02695 AESM daemon in Intel Software Guard Extensions Platform Software Component for Linux… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-33135 · CVE Program
- CVE-2021-33135 · NVD
- FIRST EPSS
- GHSA-q2pr-ffxw-p47h · GitHub Advisory Database · CC BY 4.0
- CVE-2021-33135 · Red Hat security data · CC BY 4.0
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