CVE-2026-57537

Executive Summary

CVE-2026-57537 is a memory corruption vulnerability in Qualcomm Congo firmware, classified under CWE-416 (Use After Free), caused by concurrent access and modification of geographic mapping data without proper synchronization. An authenticated attacker with local access can exploit a race condition in the affected firmware subsystem to achieve high-impact confidentiality, integrity, and availability compromise, reflected in a CVSS 3.1 base score of 7.8 (High). No public proof-of-concept, exploit code, or Nuclei template exists, and the vulnerability is not listed in CISA KEV; however, firmware memory-corruption flaws in mobile/LTE/embedded baseband and platform components are historically attractive to post-exploitation and privilege-escalation chains, so defensive teams should treat this as prioritization-relevant despite low observed exploitation activity (EPSS ~0.11%, 1.2% percentile).

Technical Analysis

The NVD description states that the defect is a memory corruption condition that manifests "when accessing and modifying geographic mapping data concurrently without proper synchronization." The CNA classifies the weakness as CWE-416 (Use After Free). Taken together, the vulnerability class is a concurrency-induced use-after-free race condition: a shared data structure that holds geographic/location mapping data is read (accessed) while another execution context writes (modifies) or frees it, and no synchronization primitive serializes the two operations. When the interleaving is favorable to the attacker, a stale reference to a freed object is dereferenced, corrupting memory.

The following conclusions are derivable strictly from the supplied data:

• Attack surface: A firmware subsystem that maintains geographic mapping data. Because the CVSS vector specifies AV:L (Local) and PR:L (Low privileges), the vulnerable code path is reachable from a context that already holds local, low-privileged access on the device — for example, a co-resident application, a sandboxed process, or a lower-privileged execution domain that can issue requests which reach the mapping-data handler.
• Trigger precondition: Two or more execution contexts must act on the same mapping data concurrently. This is a timing-dependent bug, meaning reliability is governed by the attacker's ability to widen the race window (e.g., repeated invocation) rather than by a deterministic code path.
• Weakness semantics (CWE-416): The exploitable consequence is a dereference of memory that has already been released, which in native firmware code typically yields attacker-influenced heap or pool metadata corruption rather than a clean, controlled primitive.
• Impact profile (from CVSS subscores): C:H/I:H/A:H — total loss of confidentiality, integrity, and availability within the security scope of the vulnerable component (S:U, scope unchanged). UI:N indicates no victim interaction is required beyond the attacker's own triggering actions. AC:L indicates the race is assessed as practically winnable without exotic preconditions once the attacker can reach the code path.

Explicit gaps. The source data contains no function names, class names, file paths, API endpoints, parameter names, memory-allocation routine names, or synchronization primitives. No affected version range, SoC model, firmware build, or component identifier is provided. The precise root cause (double-free vs. classic dereference-after-free, the object type involved, or whether the race is thread-level or interrupt-level) cannot be determined from the available intelligence and is not asserted here.

Exploitation Scenarios

No public PoC, exploit code, or Nuclei template is available for CVE-2026-57537. The attack chain below is inferred from the vulnerability class (concurrency use-after-free) and the CVSS vector, not from observed exploit artifacts. No specific function names or code patterns are asserted because none are present in the source data.

1. Reconnaissance / target identification. The attacker first requires a foothold granting local, low-privileged execution in a domain that can reach the geographic-mapping data handler on the target Qualcomm Congo firmware device. Because exposure requires AV:L/PR:L, external network scanning is not the primary reconnaissance vector; instead, the attacker enumerates installed applications, sandboxed processes, or co-resident execution domains on an already-compromised or attacker-influenced device, and identifies which of them can invoke functionality that reads or writes geographic mapping data.

2. Triggering the flaw class. With local access established, the attacker causes concurrent access and modification of the same geographic mapping data. For a use-after-free race, this means inducing one context to release or reallocate the mapping object while a second context retains and subsequently uses a reference to it. In practice this looks like issuing repeated requests against the mapping-data interface from one context while forcing teardown or reassignment of the underlying object from another — the specific invocable interface is not disclosed in the source data, so the attacker must discover it empirically on the target.

3. Payload / execution method (class level). The primitive obtained is memory corruption via dereference of freed memory. Classically, exploitation proceeds by shaping the freed allocation so that an attacker-influenced object occupies the reclaimed slot, thereby converting the stale reference into a controlled read/write of adjacent memory. Note: no heap-grooming details, allocation sizes, or object layouts are available for this CVE; reliability depends on winning the race and on allocator behavior in the affected firmware build.

4. Post-exploitation impact. Per C:H/I:H/A:H with scope unchanged, successful exploitation yields full compromise of the vulnerable component's confidentiality, integrity, and availability. On a firmware platform this typically means the attacker can read sensitive data handled within the component's scope (which, given the mapping-data context, plausibly includes location-derived information), alter or corrupt that data, and cause denial of service via crash. Whether the corruption can be escalated beyond the component's scope (e.g., to full device compromise or code execution in a higher-privileged domain) cannot be determined from the available data without the affected component's privilege architecture and mitigation state.

Impact Assessment

• Confidentiality (High): Full read access within the vulnerable component's scope; geographic mapping data and any adjacent in-memory structures reachable from the corrupted allocation are exposed.
• Integrity (High): The corruption primitive permits modification of the mapping data and potentially adjacent memory, undermining trust in the component's outputs.
• Availability (High): A memory-corruption race in native firmware code frequently terminates in a crash, reboot, or watchdog reset, yielding denial of service even when exploitation for code execution fails.
• Privilege context: PR:L — an attacker must already hold low privileges on the target. This is not an unauthenticated remote exploit; it is a local escalation / post-compromise capability within a firmware component.
• Blast radius: Constrained by S:U (scope unchanged) at the component level, but the practical blast radius depends on how privileged the affected Qualcomm Congo firmware subsystem is and what it can reach. No version, SoC, or product model data is available, so the absolute population of affected devices cannot be quantified from this intelligence.
• Exploitation likelihood: EPSS 0.00110 (~0.11%, 1.2nd percentile) indicates very low predicted near-term exploitation activity; no CISA KEV listing; no public PoC. Residual risk is driven by the software's deployment breadth and by the historical targeting value of this class of component, not by current exploitation telemetry.

Detection Guidance

Detection for a timing-dependent, local firmware memory race is inherently difficult: there is no network request signature, and the corruption is observable only as anomalous runtime behavior. The rules below are consequently behavioral/telemetry-based heuristics for the vulnerability class, not signatures for a known exploit — none exists publicly.

Sigma Rule

title: Suspicious Firmware Memory Fault / Concurrent Mapping Data Access (CVE-2026-57537 class)
id: 9c1f3b7a-5d24-4e0b-8a6f-cve202657537
status: experimental
description: Detects repeated abnormal termination of the Qualcomm Congo firmware subsystem handling geographic mapping data, consistent with a use-after-free race (CWE-416).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-57537
author: valtersit.com
date: 2026/01/01
logsource:
  category: process_creation
  product: linux
detection:
  selection_proc:
    Image|endswith:
      - '/congo_firmware'
      - '/mappingd'
  selection_crash:
    ExitCode:
      - '139'   # SIGSEGV
      - '134'   # SIGABRT
  condition: selection_proc and selection_crash
falsepositives:
  - Legitimate firmware update or crash of unrelated subsystem
  - Developer debugging sessions
level: medium
tags:
  - attack.t1068
  - cwe.416

YARA Rule

rule CVE_2026_57537_Qualcomm_Congo_Mapping_UAF
{
    meta:
        description = "Heuristic memory-corruption indicator for Qualcomm Congo firmware geographic mapping subsystem (CVE-2026-57537, CWE-416)"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-57537"
        date = "2026-01-01"
        severity = "high"

    strings:
        $m1 = "geographic mapping" ascii nocase wide
        $m2 = "mapping_data" ascii wide
        $m3 = "congo" ascii wide nocase

    condition:
        uint16(0) == 0x5A4D and any of ($m*)   // PE image containing mapping-data symbols
}

Note: the string anchors above are heuristic name fragments, not confirmed symbols from the affected binary; no symbols or offsets are published for this CVE.

Suricata IDS Rule

alert ip any any -> any any (msg:"CVE-2026-57537 Qualcomm Congo firmware mapping-data concurrent-access heuristic (no public exploit)"; flow:to_server; threshold: type threshold, track by_src, count 200, seconds 10; classtype:misc-attack; sid:57537001; rev:1; metadata:created_at 2026_01_01, cve CVE-2026-57537, cwe CWE-416;)

This rule is a rate/volume heuristic only. Because the flaw is local (AV:L) and has no disclosed wire protocol, no true network signature is possible; this rule will produce false positives and should be tuned or disabled in environments without relevant traffic.

Elastic Detection

process where event.type == "end" and
  process.name in ("congo_firmware", "mappingd") and
  process.exit_code in (139, 134, 137) and
  process.thread.name != null

Complements the above by correlating abnormal termination of the mapping-data-bearing process with multi-threaded execution context. Tune process.name to the actual binary name on the target firmware, which is not disclosed in the source data.

Splunk SPL Query

index=main (source="*/kernel.log" OR source="*/messages" OR source="*/congo*")
| search ("use-after-free" OR "use after free" OR "UAF" OR "geographic mapping" OR "mapping data" OR "slab corruption" OR "general protection fault")
| stats count min(_time) as first_seen max(_time) as last_seen values(host) as hosts values(message) as evidence by dest
| where count >= 3
| sort - count

Detects kernel/console messages indicative of memory corruption in the affected subsystem. The where count >= 3 clause filters one-off noise; a sustained UAF race typically produces repeated corruption reports.

Wazuh OSSEC Rule

<group name="qualcomm,cve-2026-57537,">
  <rule id="575370" level="10" frequency="3" timeframe="120">
    <if_matched_sid>1002</if_matched_sid>
    <match>CVE-2026-57537</match>
    <description>CVE-2026-57537: Repeated memory-corruption indicators in Qualcomm Congo mapping subsystem</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>memory_corruption,cwe_416,</group>
  </rule>
</group>

Rule 1002 is a stock OSSEC/Wazuh base rule for kernel or system log messages; adjust the parent SID to match your local decoder for the affected firmware console output.

Mitigation & Patch Guidance

Patch confidence: 2/4 — CLAIMED. A single source (NVD) asserts that a patch exists for this vulnerability, but no vendor advisory, commit reference, KB number, or fixed version string was supplied in the source data, and the claim is not independently confirmed. Treat remediation as pending verification.

1) Immediate mitigations (until a verified patch is applied):

• Restrict local, low-privileged execution domains on affected devices: enforce application sandboxing and least-privilege policies so that untrusted or third-party code cannot reach the geographic-mapping data interface (PR:L is the gate, so raising the bar on local code execution directly reduces exposure).
• Reduce co-residency: minimize the number of concurrently running processes that can invoke mapping-data functionality; eliminate any unnecessary consumer of that data.
• Apply standard firmware memory-hardening posture where the platform supports it (allocator hardening, stack/heap canaries, ASLR/PaX-style mitigations). These impede reliable exploitation of a UAF but do not remove the flaw.
• Monitor for repeated abnormal termination of the affected subsystem (see Detection Guidance) and treat repeated crashes as a potential exploitation-attempt signal; enable and forward firmware/kernel console logs to the SOC.
• Isolate affected devices on segmented networks with strict east-west controls to limit post-exploitation lateral movement if the corruption is leveraged beyond the component's scope.

2) Patch / upgrade steps:

• Register on the vendor's security advisory channel for Qualcomm / the affected OEM product line and wait for a vendor-confirmed fixed firmware version; do not deploy based on the unverified NVD patch claim alone.
• When a fixed build is published, perform a staged rollout: validate the fixed image in a lab device holding the same SoC/firmware baseline, then stage by cohort, with rollback capability retained.
• Because no affected version range is known, inventory all deployed Qualcomm Congo firmware assets and map build identifiers so that the fixed version can be diffed against the field population.

3) Long-term hardening:

• Require documented synchronization discipline (locking, reference counting, or atomic ownership transfer) for any shared state consumed by multiple execution contexts in firmware — the root weakness here is a missing synchronization contract for geographic mapping data.
• Integrate static and dynamic race/UAF detection (e.g., thread-sanitizer-style instrumentation, fuzzing with concurrent access patterns) into firmware CI for components handling shared mapping state.
• Establish an SBOM-driven patch workflow for embedded/baseband firmware so that vendor advisories can be mapped to deployed builds without manual reconciliation.
• Maintain a standing exception process for patch-confidence gaps: unverified "claimed" fixes should be tracked as open risk until the vendor confirms.

References

• NVD — CVE-2026-57537: https://nvd.nist.gov/vuln/detail/CVE-2026-57537
• CWE-416, Use After Free (MITRE): https://cwe.mitre.org/data/definitions/416.html
• FIRST EPSS — scoring model and current CVE scoring: https://www.first.org/epss/
• CISA Known Exploited Vulnerabilities Catalog (CVE-2026-57537 is not listed as of this report): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• Qualcomm Product Security / vulnerability reporting portal (vendor advisory channel): https://www.qualcomm.com/company/product-security

Exploitation-in-the-wild status: No public PoC, no exploit code, no Nuclei template, no CISA KEV entry, and EPSS ~0.11% (1.2nd percentile). No threat actor campaign is associated with CVE-2026-57537 in the provided data.