CVE-2026-58006

Executive Summary

CVE-2026-58006 is an untrusted pointer dereference vulnerability (CWE-822) in Altera Trusted Firmware running on the Hard Processor System (HPS) of Altera SoC FPGA devices. The flaw permits exploitation of improperly configured or implemented memory protections and affects Trusted Firmware through release socfpga_v2.14.0. With a CVSS base score of 8.1 and a Scope:Changed vector, successful exploitation can compromise the integrity and availability of the secure firmware environment, potentially allowing an attacker with high local privileges to escape intended memory isolation boundaries and execute privileged code.

Technical Analysis

The vulnerability is classified under CWE-822 — "Untrusted Pointer Dereference." This weakness occurs when software dereferences a pointer value that originates from an untrusted source or from a memory region whose contents cannot be validated. In the context of Altera Trusted Firmware on the HPS, the firmware executes at a privileged exception level and manages memory protection, secure boot, and isolation between execution contexts. An untrusted pointer dereference in this environment means the firmware may follow a pointer derived from attacker-influenced or unvalidated data, causing it to read from or write to a memory location outside its intended protection domain.

The NVD description states the impact as "Exploitation of Improperly Configured or Implemented Memory Protections." This indicates the dereference can be leveraged to defeat memory isolation controls — for example, by manipulating the firmware into accessing memory that the protection configuration was meant to guard, or by corrupting the protection configuration itself. Because Trusted Firmware is the privileged security layer on HPS, a flaw here undermines the root of trust for memory protections.

The CVSS vector provides precise insight into the attack conditions:

• AV:L (Local): The attacker requires local access to the target device or a local execution context. This is consistent with firmware that is not exposed over a network interface.
• AC:L (Low): No special preconditions beyond the ability to trigger the vulnerable code path; exploitation is straightforward once local access is achieved.
• PR:H (High): The attacker must already possess privileged access on the system prior to exploitation. This is not an unauthenticated or low-privilege escalation from an arbitrary user; it is a privilege escalation or boundary-violation from an already privileged position.
• UI:N (None): No user interaction is required.
• S:C (Scope:Changed): The exploited component (Trusted Firmware) impacts resources beyond its own security scope. This is significant — it means a compromise in firmware can affect the broader system, such as the rich operating system, other secure worlds, or hardware-level protections governed by the firmware.
• C:L (Low confidentiality): Some information disclosure is possible but not total.
• I:H (High integrity) and A:H (High availability): The attacker can substantially modify firmware-controlled resources and disrupt availability.

The affected range extends "through socfpga_v2.14.0," meaning all releases of the Altera/Intel SoC FPGA Trusted Firmware up to and including that version are considered vulnerable. No fixed version is identified in the available data.

Because the description is sparse, the exact function, parameter, or command interface that carries the untrusted pointer is not publicly documented. The attack surface is nevertheless constrained to a local, highly privileged context. Typical candidate surfaces in Trusted Firmware on HPS include secure monitor call (SMC) handlers invoked by lower-privilege software, mailbox or inter-processor communication interfaces, and configuration data parsed from non-secure memory. The exact vector is not specified in the advisory and should not be assumed.

Exploitation Scenarios

No public proof-of-concept, exploit code, or Nuclei template exists for CVE-2026-58006. The following attack chain is therefore inferred at the vulnerability-class level from the NVD description and the CVSS vector; specific function names, register values, or memory addresses cannot be derived from the available data and are deliberately not invented here.

1. Reconnaissance and target identification. The attacker identifies a device running Altera Trusted Firmware on an HPS-based SoC FPGA platform at a version at or below socfpga_v2.14.0. This requires either physical access, access to a debug interface, or an existing foothold on the device at a high privilege level (consistent with PR:H).

2. Triggering the untrusted pointer dereference. From the already-privileged local context, the attacker supplies or manipulates the input that the firmware treats as a pointer without adequate validation. Per the CWE-822 class, this means the firmware reads or writes through a pointer value that should have been validated for bounds and provenance. The trigger occurs within a firmware code path that processes attacker-influenced data.

3. Payload/execution at the vulnerability-class level. The dereference is steered toward a memory region whose protections are improperly configured or implemented, as described by the advisory. The consequence is that the attacker gains the ability to read from or write to memory the firmware was supposed to protect. No specific payload construction is documented publicly.

4. Post-exploitation impact. With S:C, the impact escapes the firmware's own scope. The attacker can alter firmware-controlled state with high integrity impact, degrade availability, and obtain limited information disclosure. In a real deployment, this could translate into defeating memory isolation guarantees, tampering with secure configuration, or causing persistent firmware-level compromise on the SoC.

The requirement for prior high privilege (PR:H) and local access (AV:L) means this is not a remotely exploitable, unauthenticated vulnerability. It is most relevant to an attacker who has already achieved a privileged foothold and seeks to break out of a restricted execution context or subvert the firmware protection model.

Impact Assessment

The primary business impact is loss of trust in the platform's secure execution environment. Altera SoC FPGA with HPS is used in embedded, networking, industrial, and infrastructure equipment where the HPS acts as the control and security processor. If memory protections in Trusted Firmware can be subverted, downstream guarantees — secure boot chaining, isolation between secure and non-secure worlds, and integrity of protected memory — become unreliable.

Using the CVSS subscores: Integrity is High, meaning protected configuration and code could be modified; Availability is High, meaning firmware failures or resets could disrupt the device; Confidentiality is Low, meaning limited data exposure. The Scope:Changed metric raises severity because the compromise propagates beyond the firmware component. A base score of 8.1 places this in the High severity band.

The blast radius is bounded by the access prerequisites. An attacker must already be privileged and local. Systems that ship HPS-based SoCs and expose privileged debug, update, or inter-processor interfaces are at the greatest risk. No EPSS score is available (not yet scored by FIRST.org), and the CVE is not listed in CISA KEV. No exploit code or PoC is publicly available.

Detection Guidance

Sigma Rule

title: Altera Trusted Firmware Untrusted Pointer Dereference (CVE-2026-58006)
id: 3b7c1f42-9d5e-4a11-8f60-6c2e0d9a7b31
status: experimental
description: Detects indicators consistent with local attempts to trigger a firmware region fault or secure monitor abort on Altera HPS platforms.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-58006
author: valtersit.com threat intel
date: 2026/01/01
logsource:
    product: linux
    service: kernel
detection:
    keywords:
        - 'trusted firmware'
        - 'socfpga'
        - 'secure monitor'
        - 'smc call failed'
        - 'firmware region fault'
    condition: keywords
falsepositives:
    - Legitimate firmware update or diagnostic activity
level: high

YARA Rule

rule CVE_2026_58006_Altera_TF_Pointer_Deref
{
    meta:
        author = "valtersit.com threat intel"
        description = "Detects artifacts referencing Altera Trusted Firmware vulnerable version range (through socfpga_v2.14.0)"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-58006"
        date = "2026-01-01"
    strings:
        $s1 = "socfpga_v2.14.0" ascii wide
        $s2 = "Trusted Firmware" ascii wide
        $s3 = "socfpga" ascii wide
    condition:
        any of ($s1, $s3) and $s2
}

Suricata IDS Rule

alert tcp any any -> any any (msg:"CVE-2026-58006 Attempted Trusted Firmware Abuse on Altera HPS (local/carried traffic)"; flow:to_server; content:"socfpga"; nocase; content:"trusted firmware"; nocase; distance:0; within:200; classtype:attempted-admin; reference:cve,2026-58006; sid:202658006; rev:1;)

Elastic Detection

sequence by host.id
  [kernel where message like~ "*trusted firmware*" and message like~ "*error*"]
  [kernel where message like~ "*secure monitor*" or message like~ "*smc*abort*"]

Splunk SPL Query

index=main (source="*kernel*" OR source="*syslog*")
| search ("Trusted Firmware" OR "socfpga" OR "secure monitor" OR "smc call")
| eval cve="CVE-2026-58006"
| table _time host source message cve
| sort - _time

Wazuh OSSEC Rule

<group name="altera,trusted_firmware,">
  <rule id="100806" level="12">
    <decoded_as>syslog</decoded_as>
    <match>Trusted Firmware|socfpga|secure monitor</match>
    <description>CVE-2026-58006: Possible Altera Trusted Firmware untrusted pointer dereference activity on HPS</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>firmware,vulnerability_attempt,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix or workaround is documented in the available data, and no fixed firmware version has been identified. The following is defensive guidance, not a confirmed remediation.

1. Immediate mitigations.

   • Restrict and audit local privileged access to HPS-based devices. Because exploitation requires PR:H and AV:L, tightly controlling who and what can reach privileged execution contexts is the most effective compensating control.
   • Disable or restrict debug interfaces (JTAG, serial console, debug UART) and inter-processor communication paths where operationally feasible.
   • Enforce secure boot and verify firmware integrity at every boot to detect tampering.
   • Monitor for anomalous firmware region faults, secure monitor aborts, and unexpected resets as potential signs of exploitation attempts.

2. Patch/upgrade steps.

   • Track the Altera/Intel SoC FPGA Trusted Firmware repository and any associated security advisories for an official fix that raises the version above socfpga_v2.14.0. No such fix is currently identified in the available evidence.
   • When a fixed release is published, validate it against your platform configuration and deploy using authenticated, signature-verified update channels.
   • Do not assume that any specific version above the affected range is fixed until confirmed by the vendor.

3. Long-term hardening.

   • Adopt a vulnerability management process covering firmware and boot-chain components, not just host operating systems.
   • Apply principle of least privilege to the software entities allowed to issue commands to Trusted Firmware.
   • Enable memory protection and isolation features supported by the platform, and verify their configuration as part of device provisioning.
   • Maintain an inventory of HPS-based devices and their firmware versions to quickly scope future advisories.

References

• NVD — CVE-2026-58006: https://nvd.nist.gov/vuln/detail/CVE-2026-58006
• MITRE CWE-822 — Untrusted Pointer Dereference: https://cwe.mitre.org/data/definitions/822.html
• FIRST EPSS: Not yet scored for this CVE (no value available at time of writing)
• CISA Known Exploited Vulnerabilities Catalog: CVE-2026-58006 not listed
• Altera/Intel SoC FPGA Trusted Firmware project (affected component; consult vendor advisories for an official patch above socfpga_v2.14.0)

No threat actor campaigns or exploit-in-the-wild evidence are associated with CVE-2026-58006 in the available data. No public PoC, exploit code, or Nuclei template has been observed.