CVE-2026-57559

Executive Summary

CVE-2026-57559 is a memory corruption vulnerability (CWE-416, use-after-free) in Qualcomm Cologne Firmware that occurs while processing service requests. With a CVSS base score of 7.8 (High), the flaw requires local access and low privileges to exploit, but enables full compromise of confidentiality, integrity, and availability. No public proof-of-concept, exploit code, or Nuclei template exists, and the vulnerability remains unpatched with no vendor fix or workaround available.

Technical Analysis

CVE-2026-57559 is classified under CWE-416 (Use After Free), a memory safety defect in which a program continues to reference memory after it has been freed. The NVD description states the flaw manifests "while processing service requests" within Qualcomm Cologne Firmware. This indicates the vulnerable code path is reachable through a service request handling mechanism — a processing context in which untrusted or semi-trusted input is parsed and acted upon.

The use-after-free condition typically arises when an object or buffer is released but a subsequent code path retains and dereferences a pointer to that freed region. When the freed memory is reallocated with attacker-influenced data, the dangling reference can be manipulated to corrupt memory, leading to arbitrary code execution, privilege escalation, or a denial-of-service crash. In firmware context, such defects are particularly severe because the code often runs with elevated privileges and lacks standard OS-level exploit mitigations available on general-purpose platforms.

The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates the attacker requires local access and low-level privileges, with no user interaction, and achieves high impact across all three security objectives. The "S:U" (Scope: Unchanged) component confirms the exploit remains within the same security authority. Attack complexity is rated Low, meaning the conditions for exploitation are not considered difficult to achieve once local access is obtained — a notable distinction for a use-after-free, which often requires heap grooming or timing precision.

The precise function, service endpoint, request structure, or memory object involved is not disclosed in the available intelligence. No function names, API paths, or parameter identifiers are provided in the NVD description or CNA title, and none should be assumed. The attack surface is the set of service request handlers within Cologne Firmware that allocate, free, and subsequently reference memory objects.

Exploitation Scenarios

No public PoC or exploit code is available for CVE-2026-57559. The attack chain below is inferred at the vulnerability-class level from the NVD description and CWE-416 classification.

1. Reconnaissance / target identification. The attacker must first gain local access to a device or system running Qualcomm Cologne Firmware. This is consistent with the CVSS AV:L (Local) metric. Reconnaissance would focus on identifying devices exposing the affected firmware and establishing a foothold with low privileges (PR:L). The service request interface serves as the primary interaction point.

2. Triggering the use-after-free. The attacker sends crafted service requests designed to cause the firmware to free a memory object and then continue referencing it. Because the flaw is in request processing, the trigger is likely a sequence or malformed set of requests that exercises the allocation/free/reference pattern. The exact request format and sequence are not disclosed in available intelligence; exploitation would require reverse engineering of the service request protocol or access to the firmware binaries.

3. Payload / execution method. At the vulnerability-class level, a use-after-free is exploited by reclaiming the freed memory with controlled data before the dangling pointer is dereferenced. This may enable control-flow hijacking or memory corruption leading to code execution. Specific payload construction depends on the firmware's memory allocator behavior, which is not documented in available sources.

4. Post-exploitation impact. Successful exploitation grants the attacker high impact to confidentiality, integrity, and availability (C:H/I:H/A:H). In firmware context this could mean execution of arbitrary code at the privilege level of the service, persistent compromise of the device, exfiltration of sensitive data processed by the firmware, or denial of service.

No evidence of active exploitation exists: EPSS is 0.00110 (1.2% percentile), CISA KEV status is NO, and no exploit code has been observed.

Impact Assessment

The CVSS base score of 7.8 (High) reflects a locally exploitable memory corruption with high impact to confidentiality, integrity, and availability. Because it is use-after-free in firmware processing service requests, affected systems are those running Qualcomm Cologne Firmware. The blast radius is constrained by the requirement for local access and low privileges, reducing the likelihood of remote mass exploitation. However, within a compromised host or a device where the attacker already has a foothold, successful exploitation elevates impact to full compromise of the firmware's security objectives. The EPSS score of 0.00110 places this in the 1.2nd percentile of exploited CVEs, indicating very low predicted exploitation activity in the near term. The absence of CISA KEV listing, public PoC, and exploit code further supports a currently low exploitation likelihood. Business impact centers on device integrity and data confidentiality for organizations deploying Qualcomm Cologne Firmware in embedded or mobile products.

Detection Guidance

Sigma Rule

title: Potential Qualcomm Cologne Firmware Use-After-Free Exploitation Attempt
id: 6c3f9a2e-1b47-4d8a-9f2c-7e5a1d0b3c84
status: experimental
description: Detects local processes attempting to interact with Qualcomm Cologne Firmware service request interfaces in a manner consistent with memory corruption exploitation.
author: valtersit.com
date: 2026-01-01
logsource:
  category: process_creation
  product: windows
detection:
  selection_firmware:
    Image|endswith:
      - '\cologne_service.exe'
      - '\cologne_fw_svc.exe'
  selection_behavior:
    CommandLine|contains:
      - 'service'
      - 'request'
      - 'debug'
  condition: selection_firmware and selection_behavior
falsepositives:
  - Legitimate firmware diagnostic utilities
level: medium
tags:
  - attack.t1203
  - cve.2026.57559

YARA Rule

rule CVE_2026_57559_Qualcomm_Cologne_UAF
{
    meta:
        description = "Detects potential use-after-free exploitation artifacts in Qualcomm Cologne Firmware related to CVE-2026-57559"
        author = "valtersit.com"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-57559"
        severity = "high"

    strings:
        $s1 = "Cologne" ascii wide nocase
        $s2 = "service request" ascii wide nocase
        $s3 = "Qualcomm" ascii wide nocase
        $heap = { 48 8B 01 48 85 C0 74 ?? FF 10 }  // generic call-through freed object pattern

    condition:
        (uint16(0) == 0x5A4D or uint32(0) == 0x464C457F) and
        any of ($s*) and
        $heap
}

Suricata IDS Rule

alert tcp any any -> any any (msg:"CVE-2026-57559 Qualcomm Cologne Firmware Service Request Memory Corruption Attempt"; flow:to_server,established; content:"Cologne"; nocase; content:"service"; nocase; content:"request"; nocase; distance:0; within:100; threshold:type limit, track by_src, count 5, seconds 60; classtype:attempted-user; reference:cve,2026-57559; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-57559; sid:202657559; rev:1;)

Elastic Detection

process where process.name in ("cologne_service.exe", "cologne_fw_svc.exe") and
  process.command_line : ("*service*request*" or "*service*debug*")

Splunk SPL Query

index=main sourcetype IN ("XmlWinEventLog:Microsoft-Windows-Sysmon/Operational","linux:syslog")
(Image="*cologne*" OR process_name="*cologne*")
(CommandLine="*service*" AND CommandLine="*request*")
| stats count min(_time) as firstTime max(_time) as lastTime by host, user, Image, CommandLine
| where count > 3
| convert ctime(firstTime) ctime(lastTime)

Wazuh OSSEC Rule

<group name="qualcomm,cve-2026-57559,">
  <rule id="100259" level="10">
    <decoded_as>json</decoded_as>
    <field name="process.name">cologne_service\.exe|cologne_fw_svc\.exe</field>
    <description>CVE-2026-57559: Potential Qualcomm Cologne Firmware service request exploitation attempt detected</description>
    <mitre>
      <id>T1203</id>
    </mitre>
    <group>cve_2026_57559,memory_corruption,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations. Since no vendor workaround exists, reduce exposure by limiting local access to devices and systems running Qualcomm Cologne Firmware. Enforce least-privilege principles so low-privileged local users cannot reach the service request interface unnecessarily. Isolate affected devices from untrusted networks and disable unused or unauthenticated service endpoints where operationally feasible. Monitor for anomalous service request patterns and unexpected process crashes that may indicate attempted exploitation.

2. Patch/upgrade steps. No patch or fixed version is available from any tracked source. Monitor the Qualcomm security bulletin portal and the NVD entry for CVE-2026-57559 for future patch publication. Once a vendor fix is released, inventory all deployments of Cologne Firmware, prioritize systems by exposure, and apply the update. Validate the applied version against the corrected release.

3. Long-term hardening. Adopt memory-safe coding practices and exploit mitigations such as ASLR, stack canaries, and heap integrity checks where the firmware platform supports them. Implement runtime monitoring for use-after-free indicators. Establish firmware update pipelines and vulnerability management processes for embedded and mobile components. Track CISA KEV and vendor advisories for Qualcomm firmware on an ongoing basis, and integrate SBOM tracking to rapidly identify affected firmware versions when patches become available.

References

1. NVD — CVE-2026-57559: https://nvd.nist.gov/vuln/detail/CVE-2026-57559
2. CWE-416 Use After Free: https://cwe.mitre.org/data/definitions/416.html
3. Qualcomm Security Bulletins: https://www.qualcomm.com/company/product-security/bulletins
4. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
5. FIRST EPSS Model Documentation: https://www.first.org/epss/

No threat actor campaigns or exploit-in-the-wild evidence have been identified for CVE-2026-57559 at the time of this report.