CVE-2026-64528

System hang via recursive serial port locking

Published Jul 25, 2026 · Updated Jul 25, 2026

Deadlock in the Linux kernel Samsung serial driver allows attackers to hang affected systems when console flow control is enabled. The s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable() helpers call uart_port_lock_irqsave() even though their callers already hold the nonrecursive port->lock spinlock. The condition requires UPF_CONS_FLOW and a transmit stop or start path; the resulting same-CPU lockup interrupts service rather than corrupting data or executing code.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel Samsung serial driver allows attackers to hang affected systems when console flow control is enabled. The s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable() helpers call uart_port_lock_irqsave() even though their callers already hold the nonrecursive port->lock spinlock. The condition requires UPF_CONS_FLOW and a transmit stop or start path; the resulting same-CPU lockup interrupts service rather than corrupting data or executing code.

The record

CVE
CVE-2026-64528
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.27
  2. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <10014eb7eee351f7b587f8ac85830f0c9343cb9a
  3. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <14143ec10d69f42806b5d7b046f0fd1b835831ae
  4. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <9c92b42207978559e32903c3098aaf5c5b5788b2
  5. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <9fd48937046efc9abb89379d63ee9cc5c661d711
  6. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <a3bb136bff5e6a5e48cdd813246c9c4686feaaa9
  7. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <a9c22e0f93ba18322a6623ecdda2f0cd858ca350
  8. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <ee9eb72be95490602c493db050c73d925c3a4d74
  9. Affected versionversion=b497549a035c2a81b71c7a27f2b00c8a16c09423 <f4c3e63fa8639aedf96fb200d9939945a9eed51e

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.27; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <10014eb7eee351f7b587f8ac85830f0c9343cb9a; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <14143ec10d69f42806b5d7b046f0fd1b835831ae; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <9c92b42207978559e32903c3098aaf5c5b5788b2; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <9fd48937046efc9abb89379d63ee9cc5c661d711; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <a3bb136bff5e6a5e48cdd813246c9c4686feaaa9; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <a9c22e0f93ba18322a6623ecdda2f0cd858ca350; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <ee9eb72be95490602c493db050c73d925c3a4d74; version=b497549a035c2a81b71c7a27f2b00c8a16c09423 <f4c3e63fa8639aedf96fb200d9939945a9eed51e

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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