# CVE-2026-64528 — Linux

> As of 2026-07-25, CVE-2026-64528 is a vulnerability in Linux, EPSS 0.1% (6.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-64528 as of 2026-07-25; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-25

## What is CVE-2026-64528?

In the Linux kernel, the following vulnerability has been resolved: tty: serial: samsung: Remove redundant port lock acquisition in rx helpers Sashiko identified a deadlock when the console flow is engaged [1]. When console flow control is enabled (UPF_CONS_FLOW), s3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and s3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable(). The serial core framework invokes the .stop_tx() and .start_tx() callbacks with the port->lock spinlock already held. Furthermore, all internal driver paths that invoke stop_tx (such as the DMA TX completion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ handler s3c24xx_serial_tx_irq()) also acquire port->lock prior to calling it. (Note that s3c24xx_serial_start_tx() is only invoked by the serial core). However, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable() unconditionally attempt to acquire port->lock again using uart_port_lock_irqsave(). Since spinlocks are not recursive, this causes a deadlock on the same CPU when console flow control is engaged. Remove the redundant lock acquisition from both rx helper functions.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 72 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 6.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-25

## Is CVE-2026-64528 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Linux](https://intel.threadlinqs.com/vendors/linux): Linux

## How to fix CVE-2026-64528

No vendor patch reference has been recorded for CVE-2026-64528 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-64528

No threat campaign in the Threadlinqs corpus currently references CVE-2026-64528, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-07-26. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74)
- [git.kernel.org (10014eb7eee351f7b587f8ac85830f0c9343cb9a)](https://git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a)
- [git.kernel.org (f4c3e63fa8639aedf96fb200d9939945a9eed51e)](https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e)
- [git.kernel.org (a9c22e0f93ba18322a6623ecdda2f0cd858ca350)](https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350)
- [git.kernel.org (14143ec10d69f42806b5d7b046f0fd1b835831ae)](https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae)

_Showing 5 of 8 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-64528
Full detection coverage and IOCs for threats exploiting CVE-2026-64528 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp