RCU Imbalance in DRBD Kernel Module

Publication date: 2026-06-24

Last updated on: 2026-07-06

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drbd: Balance RCU calls in drbd_adm_dump_devices() Make drbd_adm_dump_devices() call rcu_read_lock() before rcu_read_unlock() is called. This has been detected by the Clang thread-safety analyzer.

CVSS Scores

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Meta Information

Published

2026-06-24

Last Modified

2026-07-06

Generated

2026-07-15

AI Q&A

2026-06-24

EPSS Evaluated

2026-07-13

NVD

CVE-2026-53128

EUVD

EUVD-2026-38996

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.2 (inc) to 6.6.141 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.91 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.33 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.10 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 5.11 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 4.5 (inc) to 5.10.258 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is related to the Linux kernel's drbd component, specifically in the function drbd_adm_dump_devices(). The issue was that the function did not properly balance calls to rcu_read_lock() and rcu_read_unlock(), which are used for safe read-side critical sections in the kernel. The fix involved ensuring that drbd_adm_dump_devices() calls rcu_read_lock() before calling rcu_read_unlock(). This problem was detected by the Clang thread-safety analyzer.

Impact Analysis

Improper balancing of rcu_read_lock() and rcu_read_unlock() calls can lead to potential race conditions or undefined behavior in the kernel, which might cause system instability or crashes. However, specific impacts such as data loss, privilege escalation, or remote exploitation are not detailed in the provided information.

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