CVE-2026-58007

Executive Summary

CVE-2026-58007 is an untrusted pointer dereference vulnerability (CWE-822) in Altera Trusted Firmware running on the Hard Processor System (HPS) of Altera SoC FPGA devices, affecting versions through socfpga_v2.14.0. A local attacker with high privileges who can influence a pointer consumed by the firmware can trigger a dereference of an attacker-controlled or otherwise untrusted pointer, leading to exploitation of improperly configured or implemented memory protections. The attacker may escape the intended security boundary (Scope: Changed), corrupting firmware-controlled memory with high integrity and high availability impact while limiting confidentiality impact.

Technical Analysis

The vulnerability class is CWE-822, "Untrusted Pointer Dereference." In this class, a program receives a pointer value from a source that is not fully trusted, then dereferences it without sufficient validation. In a Trusted Firmware context on the Altera HPS, the firmware executes at a privileged exception level (EL3 or equivalent secure monitor role) and is responsible for enforcing the isolation boundary between normal-world software and secure services. When such firmware dereferences a pointer that has not been validated against the expected address range, alignment, or provenance, the dereference can target memory that the caller was never authorized to access. This directly undermines the "improperly configured or implemented memory protections" referenced in the NVD description, because the fault is not in the hardware memory protections themselves but in the firmware's failure to keep untrusted input away from privileged memory operations.

The CVSS vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H describes the practical conditions precisely:

• AV:L (Local): the attack is not remotely reachable over a network; the attacker must already have a foothold on the device with some ability to invoke the affected firmware path.
• AC:L (Low): no special race condition or environmental precondition is required beyond the ability to supply the malicious input.
• PR:H (High): the attacker must already possess elevated privileges, meaning this is not a low-privilege-to-high-privilege escalation from nothing, but rather a boundary-crossing escalation from an already powerful position.
• UI:N (None): no user interaction is needed once the attack is staged.
• S:C (Changed): exploitation can affect resources beyond the firmware's own security scope, which is the strongest signal that this is a security-boundary-crossing vulnerability rather than a simple crash.
• C:L (Low confidentiality impact): some information exposure is possible but not total.
• I:H (High integrity impact): the attacker can modify data or control flow in a context where they should not be able to.
• A:H (High availability impact): successful exploitation can render the device or its secure services unavailable.

Because the CNA title and NVD description do not disclose specific function names, file paths, SMC handler identifiers, or argument structures, the precise call path cannot be reconstructed from public data. What can be stated with confidence is the general mechanism: a value originating outside the trusted firmware's expected set of inputs is treated as a memory address and dereferenced, and the firmware's memory-protection configuration does not prevent that dereference from reaching sensitive locations. The affected artifact set is Trusted Firmware for Altera SoC FPGA through tag/version socfpga_v2.14.0.

Exploitation Scenarios

No public proof-of-concept exists for CVE-2026-58007, and no exploit code has been observed in the wild. The following chain is therefore described at the vulnerability-class level and inferred from the CVSS vector and the untrusted-pointer-dereference mechanism; it does not reference any function name, handler name, or endpoint that is not present in the source data.

1. Reconnaissance / target identification. The attacker first identifies a target device running Altera Trusted Firmware on HPS at a version at or below socfpga_v2.14.0. Because the attack vector is Local (AV:L), the attacker must already have the ability to execute code or issue requests that reach the firmware from a privileged position on the platform. Reconnaissance focuses on determining the firmware version, since the vulnerability is present "through socfpga_v2.14.0."

2. Triggering the flaw class. The attacker supplies, through a local interface that reaches privileged firmware code, a crafted input that is interpreted as a pointer. Because the firmware fails to validate the pointer before dereferencing it, the dereference targets an address the attacker influenced or that is otherwise outside the trusted set.

3. Payload / execution at the vulnerability-class level. The dereference of the untrusted pointer causes the firmware to read from or write to memory that the memory-protection configuration was supposed to protect. Depending on whether the dereference is a read or a write, the outcome ranges from disclosure of firmware memory (consistent with C:L) to integrity violation of firmware-controlled state (consistent with I:H). No specific exploit primitive, gadget, or code pattern can be confirmed from available data, and none is asserted here.

4. Post-exploitation impact. Because the CVSS scope is Changed (S:C), the compromise is not confined to the firmware component itself; the attacker can affect resources outside the firmware's own security scope. Combined with A:H, the attacker can also degrade or deny availability of the affected platform or its secure services.

It must be emphasized that no public PoC is available; the attack chain is inferred from the vulnerability class and the published CVSS vector.

Impact Assessment

The blast radius of CVE-2026-58007 is defined by the reach of the affected firmware: Altera Trusted Firmware on the HPS of SoC FPGA devices. This is platform-initialization and security-service code, so a successful exploitation has consequences beyond a single user application:

• Integrity (I:H): firmware-controlled state can be modified, potentially affecting the trust anchor for subsequent boot or runtime stages.
• Availability (A:H): the platform or its secure services can be made unavailable.
• Confidentiality (C:L): limited disclosure of protected memory contents is possible.
• Scope (S:C): the impact can extend beyond the vulnerable component, which typically indicates a security-boundary-crossing issue rather than an isolated crash.

From a business perspective, affected deployments are those that rely on Altera SoC FPGA devices with HPS for secure boot, key management, or isolated execution. Because the required privilege level is High (PR:H) and the vector is Local (AV:L), this is not a mass-exploitation, internet-facing vulnerability, and it has not been added to CISA KEV. The realistic threat model is a post-compromise escalation: an adversary who has already achieved a privileged foothold on the device uses this flaw to cross a firmware-enforced isolation boundary. The EPSS score is not yet published by FIRST.org, so no probability estimate is available.

Detection Guidance

Detection for this vulnerability is challenging because it occurs within local firmware execution and no public exploit artifacts exist. The rules below therefore target the general behavioral signatures of untrusted pointer dereference exploitation in trusted-firmware environments: abnormal local invocation of privileged firmware paths, memory-fault or exception telemetry from the secure world, and local privilege-boundary activity around the firmware. These rules are illustrative and must be tuned to the specific deployment.

Sigma Rule

title: Potential Untrusted Pointer Dereference Exploitation in Altera Trusted Firmware (HPS)
id: 8f2c1a44-5800-4c07-9f3b-7c1d0e2a5800
status: experimental
description: Detects local attempts to invoke privileged firmware paths on Altera SoC FPGA HPS devices that may trigger an untrusted pointer dereference (CWE-822) in Trusted Firmware through socfpga_v2.14.0.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-58007
author: valtersit.com
date: 2026/01/01
tags:
  - attack.t1068
  - cve.2026.58007
logsource:
  product: linux
  service: kernel
detection:
  selection_process:
    Image|endswith:
      - '/dev/mem'
      - '/dev/kmem'
  selection_cmd:
    CommandLine|contains|all:
      - 'socfpga'
      - 'fw'
  condition: selection_process or selection_cmd
falsepositives:
  - Legitimate firmware update or diagnostic tooling
  - Vendor debug utilities
level: medium

YARA Rule

rule CVE_2026_58007_Altera_TrustedFirmware_Pointer
{
    meta:
        description = "Heuristic detection of Trusted Firmware binaries for Altera SoC FPGA HPS at or below socfpga_v2.14.0"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-58007"
        cve = "CVE-2026-58007"
        date = "2026-01-01"

    strings:
        $ver = "socfpga_v2.14.0" ascii wide
        $tf  = "Trusted Firmware" ascii wide
        $hps = "HPS" ascii wide

    condition:
        uint32(0) == 0x464C457F and any of ($tf, $hps) and $ver
}

Suricata IDS Rule

alert tcp any any -> any any (msg:"CVE-2026-58007 Altera Trusted Firmware HPS untrusted pointer dereference activity"; flow:to_server,established; content:"socfpga"; nocase; content:"fw"; nocase; threshold: type both, track by_src, count 5, seconds 60; reference:cve,2026-58007; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-58007; classtype:attempted-admin; sid:202658007; rev:1;)

Elastic Detection

process where host.os.type == "linux" and
event.category == "process" and event.type == "start" and
(process.executable : ("/dev/mem", "/dev/kmem") or
 process.command_line : "*socfpga*" or
 process.command_line : "*trusted*firmware*")

Splunk SPL Query

index=main (sourcetype=linux_secure OR sourcetype=syslog OR sourcetype=ossec)
(process="*socfpga*" OR message="*Trusted Firmware*" OR message="*untrusted pointer*" OR message="*HPS*")
| stats count min(_time) as firstTime max(_time) as lastTime by host, user, process, message
| where count > 0
| convert ctime(firstTime) ctime(lastTime)

Wazuh OSSEC Rule

<group name="altera_trusted_firmware,cve-2026-58007,">
  <rule id="100580" level="10">
    <decoded_as>syslog</decoded_as>
    <match>Trusted Firmware|socfpga|HPS</match>
    <description>CVE-2026-58007: Possible untrusted pointer dereference activity in Altera Trusted Firmware on HPS</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>privilege_escalation,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix and no workaround are currently documented in the available data.

1. Immediate mitigations. Because the vulnerability is local and requires high privileges (AV:L/PR:H), the primary near-term control is to reduce the number of principals who can reach the affected firmware path. Restrict local access to the HPS boot and secure-services interfaces to trusted administrators only, and audit for unnecessary services or debug interfaces that expose privileged firmware entry points. Where the platform configuration permits, enable and enforce the strongest available memory-protection configuration (for example, locking down MMU/MPU regions and restricting writable mappings of firmware memory), since the NVD description explicitly references "improperly configured or implemented memory protections." Monitor system logs and secure-world telemetry for unexpected fault or exception events originating from firmware execution.

2. Patch/upgrade steps. No patched release is identified by any tracked source; versions "through socfpga_v2.14.0" are affected. Track the Altera Trusted Firmware release notes and repository tags for a version above socfpga_v2.14.0 and upgrade immediately once a fix is published. Validate the upgraded firmware version and confirm the previously affected code paths are remediated. Because this report is based on the NVD description alone, verify any candidate patch against the official vendor advisory before deployment.

3. Long-term hardening. Treat firmware on the HPS as part of the trusted computing base and subject it to code review focused on pointer provenance and validation: every pointer received from outside the trusted firmware boundary should be range-checked, alignment-checked, and authorized before dereference, in line with the CWE-822 guidance. Maintain a secure-boot chain so that only signed firmware images execute, and monitor CISA KEV and vendor advisories for future exploitation evidence. Reassess deployments that rely on the HPS for security isolation, since the Changed scope indicates the boundary itself is the asset at risk.

References

• NVD — CVE-2026-58007: https://nvd.nist.gov/vuln/detail/CVE-2026-58007
• MITRE CWE-822 — Untrusted Pointer Dereference: https://cwe.mitre.org/data/definitions/822.html
• MITRE ATT&CK T1068 — Exploitation for Privilege Escalation: https://attack.mitre.org/techniques/T1068/
• Altera Trusted Firmware (socfpga) project repository and release notes: https://github.com/altera-opensource/trusted-firmware-a (returned 404 — verify manually)
• CISA Known Exploited Vulnerabilities Catalog (verify status; CVE-2026-58007 is NOT currently listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No threat actor campaigns or exploit-in-the-wild evidence are associated with CVE-2026-58007 in the data provided. No public proof-of-concept, exploit code, or Nuclei template exists at the time of writing.