# CVE-2026-33957: Samsung Exynos 1580 CustOS Driver out-of-bounds memory access

Source: https://junglewise.ai/threats/cve-2026-33957-samsung-exynos-1580-custos-driver-out-of-bounds-memory-access  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-33957 · Severity: medium · CVSS 4.2 · Published 2026-09-14

Samsung's Exynos 1580 mobile processor contains a vulnerability in its CustOS (Customizable Trusted OS) driver that allows an attacker to request oversized shared memory allocations. This flaw can result in out-of-bounds memory reads and writes, potentially corrupting sensitive data, leaking information from the device, or causing system instability. Devices using this processor may be exposed to privilege escalation or information disclosure attacks.

Technologies: [Samsung Exynos 1580](https://junglewise.ai/threats/technologies/exynos-1580). Vendors: [Samsung](https://junglewise.ai/threats/vendors/samsung).

## Quick answers

**Is CVE-2026-33957 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33957 being exploited in the wild.

**How severe is CVE-2026-33957?** Medium severity, with a CVSS score of 4.2, published 14 September 2026.

**Which products and versions are affected?** Samsung Exynos 1580 <UNKNOWN>.

**Is there a fix for CVE-2026-33957?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-33957 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-33957?** Check whether you run Samsung Exynos 1580 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an out-of-bounds memory access flaw in the CustOS Driver component of Samsung's Exynos 1580 processor. The root cause is insufficient bounds checking when handling oversized shared memory requests to the custos_iwc (Inter-world Communication) device interface. An attacker with local or firmware-level access can craft requests that exceed the allocated buffer size, enabling out-of-bounds reads and writes to kernel or trusted execution environment (TEE) memory. This can lead to memory corruption, information leakage, or privilege escalation. Patch availability from Samsung is not explicitly confirmed in the provided advisory.

## Affected products

- Samsung Exynos 1580 <UNKNOWN>

## Timeline

- 2026-09-14: disclosed: CVE-2026-33957 published on NVD
- 2026-01-07: other: Reported date per Samsung security advisory

## References

- [https://semiconductor.samsung.com/support/quality-support/product-security-updates/](https://semiconductor.samsung.com/support/quality-support/product-security-updates/)
- [https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2026-33957/](https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2026-33957/)

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