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NVD / CVE Program· CNA intel

CVE-2026-20716: Improper access control for some Intel(R) Processors within Ring 3: User Applications may allow an escalation of privilege.

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.09% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: intel-ucode (Alpine:v3.21) 20260812-r0; intel-microcode (Debian:14) 3.20260925.1; ucode-intel (openSUSE:Leap 16.0) 20260812-160000.1.1.

Low priority for now. Upgrade to intel-ucode (Alpine:v3.21) 20260812-r0; intel-microcode (Debian:14) 3.20260925.1; ucode-intel (openSUSE:Leap 16.0) 20260812-160000.1.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper access control for some Intel(R) Processors within Ring 3: User Applications may allow an escalation of privilege. Simple hardware adversary with an authenticated user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

HighCVSS 7.2 · v4.0—No exploit Fix available
Published
Aug 11, 2026
Updated
Aug 31, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · intel
7.2
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
intelxeon 634 firmware
intelxeon 634
intelxeon 636 firmware
intelxeon 636
intelxeon 638 firmware
intelxeon 638
intelxeon 654 firmware
intelxeon 654
intelxeon 656 firmware
intelxeon 656
intelxeon 658x firmware
intelxeon 658x

and 168 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • intel xeon 6315p firmwareall versions
  • intel xeon 6325p firmwareall versions
  • intel xeon 6333p firmwareall versions
  • intel xeon 6337p firmwareall versions
  • intel xeon 634 firmwareall versions
  • intel xeon 6349p firmwareall versions
  • intel xeon 6353p firmwareall versions
  • intel xeon 6357p firmwareall versions
  • intel xeon 636 firmwareall versions
  • intel xeon 6369p firmwareall versions
  • intel xeon 6377p firmwareall versions
  • intel xeon 638 firmwareall versions
  • intel xeon 6503p firmwareall versions
  • intel xeon 6503p-b firmwareall versions
  • intel xeon 6505p firmwareall versions
  • intel xeon 6507p firmwareall versions
  • intel xeon 6511p firmwareall versions
  • intel xeon 6513p-b firmwareall versions
  • intel xeon 6515p firmwareall versions
  • intel xeon 6516p-b firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (intel). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Intel(R) Processors

    • See referencesaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21intel-ucodebefore 20260812-r020260812-r0
Debian:12intel-microcodefrom 0—
Debian:14intel-microcodebefore 3.20260925.13.20260925.1
openSUSE:Leap 16.0ucode-intelbefore 20260812-160000.1.120260812-160000.1.1
openSUSE:Tumbleweeducode-intelbefore 20260812-1.120260812-1.1
SUSE:Linux Enterprise Micro 5.3ucode-intelbefore 20260812-150200.68.120260812-150200.68.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREmicrocode_ctlbefore 1.17-102.83.98.11.17-102.83.98.1
SUSE:Linux Enterprise Server 12 SP5-LTSSucode-intelbefore 20260812-164.120260812-164.1
SUSE:Linux Micro 6.0ucode-intelbefore 20260812-1.120260812-1.1
SUSE:Linux Micro 6.1ucode-intelbefore 20260812-slfo.1.1_1.120260812-slfo.1.1_1.1
SUSE:Linux Micro 6.2ucode-intelbefore 20260812-160000.1.120260812-160000.1.1

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:intel-ucode20260812-r0 · Alpine:v3.21Package registry (OSV)
debian:intel-microcode3.20260925.1 · Debian:14Package registry (OSV)
opensuse:ucode-intel20260812-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:microcode_ctl1.17-102.83.98.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:ucode-intel20260812-1.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records