CVE-2026-21366

CVE-2026-21366 is a high-severity vulnerability in Qualcomm Lemans Au Lgit Firmware with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

• Severity: High (CVSS 3.x base score 7.8)
• EPSS exploit prediction: 0% (1st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-190
• Affected product: Qualcomm Lemans Au Lgit Firmware
• Published: 2026-08-04
• Last modified: 2026-08-06

Description

Memory corruption while processing a packet with a size close to the maximum allowed value.

Frequently asked questions

What is CVE-2026-21366?

Memory corruption while processing a packet with a size close to the maximum allowed value.

How severe is CVE-2026-21366?

CVE-2026-21366 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21366?

CVE-2026-21366 primarily affects Qualcomm Lemans Au Lgit Firmware. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-21366?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-21366 published?

CVE-2026-21366 was published on 2026-08-04 and last updated on 2026-08-06.

References

• https://docs.qualcomm.com/product/publicresources/securitybulletin/august-2026-bulletin.html

Affected products (33)

• cpe:2.3:o:qualcomm:lemans_au_lgit_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:lemansau_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qam8255p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qam8295p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qam8620p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qamsrv1h_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qamsrv1m_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6574au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6595_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6595au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6688aq_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6696_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6698aq_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6797aq_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca8695au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6145p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6150p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6155p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa7255p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa7775p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8145p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8150p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8155p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8195p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8255p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8295p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8540p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8620p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8770p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa9000p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:srv1h_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:srv1l_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:srv1m_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Qualcomm Lemans Au Lgit Firmware

• CVE-2026-25289 — Critical (CVSS 9.6): Memory Corruption when processing Device Capability Extended attributes in certain NAN Service Discovery Frames with…
• CVE-2026-24088 — High (CVSS 8.2): Cryptographic Issue while processing a specific partition which allows unauthorized write access to load a customized…
• CVE-2025-59606 — High (CVSS 7.8): Memory Corruption when writing to invalid memory locations occurs due to heap memory exhaustion during secure data…
• CVE-2025-59604 — High (CVSS 7.8): Memory Corruption when running a memory copy operation due to invalid writes caused by a null pointer.
• CVE-2026-24082 — High (CVSS 7.8): Memory Corruption when copying data from a freed source while executing performance counter deselect operation.
• CVE-2025-47391 — High (CVSS 7.8): Memory corruption while processing a frame request from user.

All CVEs affecting Qualcomm Lemans Au Lgit Firmware →

Other CWE-190 (Integer Overflow or Wraparound) vulnerabilities

• CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
• CVE-2026-24814 — Critical (CVSS 10.0): Integer Overflow or Wraparound vulnerability in swoole swoole-src (thirdparty/hiredis modules). This vulnerability is…
• CVE-2025-64721 — Critical (CVSS 10.0): Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. In versions…
• CVE-2015-5108 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
• CVE-2015-5097 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
• CVE-2013-2555 — Critical (CVSS 10.0): Integer overflow in Adobe Flash Player before 10.3.183.75 and 11.x before 11.7.700.169 on Windows and Mac OS X, before…

Browse all CWE-190 (Integer Overflow or Wraparound) vulnerabilities →