CVE-2026-43440
Analyzed Analyzed - Analysis Complete
Null service_wq in Linux kernel mana driver

Publication date: 2026-05-08

Last updated on: 2026-05-21

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net/mana: Null service_wq on setup error to prevent double destroy In mana_gd_setup() error path, set gc->service_wq to NULL after destroy_workqueue() to match the cleanup in mana_gd_cleanup(). This prevents a use-after-free if the workqueue pointer is checked after a failed setup.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-21
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43440
EUVD
EUVD-2026-28746
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.18.16 (inc) to 6.18.19 (exc)
linux linux_kernel From 6.19.6 (inc) to 6.19.9 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Mitigation Strategies

The vulnerability has been resolved in the Linux kernel by setting the workqueue pointer to NULL after a failed setup to prevent use-after-free errors. To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

Executive Summary

This vulnerability exists in the Linux kernel's net/mana component. It involves a use-after-free issue caused by not setting the service_wq pointer to NULL after a failed setup in the mana_gd_setup() function. Specifically, if the setup fails, the workqueue is destroyed but the pointer is not cleared, which can lead to the pointer being checked after it has been freed, causing a use-after-free condition.

Impact Analysis

The use-after-free vulnerability can lead to undefined behavior in the Linux kernel, potentially causing system crashes, instability, or allowing an attacker to execute arbitrary code with kernel privileges. This can compromise the security and reliability of systems running the affected Linux kernel versions.

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