CVE-2026-74690
Received Received - Intake

Use-After-Free in Linux Kernel s390/ism Driver

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: s390/ism: Fix UAF of sba and ieq during ism_dev_exit() A ism interrupt handler can be active in parallel with ism_dev_exit(), accessing freed data structures. No new interrupts will be generated after unregister_ieq(). Drain ongoing interrupt handlers by free_irq(), before freeing ism data structures.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74690
EUVD
EUVD-2026-64377

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free (UAF) vulnerability in the Linux kernel's s390/ism driver. It occurs when an interrupt handler continues running after the device is being removed, accessing memory that has already been freed. The issue happens because ongoing interrupt handlers are not properly drained before freeing the device's data structures.

Impact Analysis

This vulnerability could lead to system crashes, data corruption, or privilege escalation if exploited. Attackers might trigger the UAF to execute arbitrary code in the kernel context, potentially gaining full control over the affected system.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the UAF issue in the s390/ism driver. Ensure the fix for sba and ieq handling during ism_dev_exit() is applied.

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