CVE-2026-23421

Received Received - Intake

Memory Leak in Linux Kernel drm/xe Configfs Component Fixed

Publication date: 2026-04-03

Last updated on: 2026-04-24

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drm/xe/configfs: Free ctx_restore_mid_bb in release ctx_restore_mid_bb memory is allocated in wa_bb_store(), but xe_config_device_release() only frees ctx_restore_post_bb. Free ctx_restore_mid_bb[0].cs as well to avoid leaking the allocation when the configfs device is removed. (cherry picked from commit a235e7d0098337c3f2d1e8f3610c719a589e115f)

CVSS Scores

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Meta Information

Published

2026-04-03

Last Modified

2026-04-24

Generated

2026-07-06

AI Q&A

2026-04-04

EPSS Evaluated

2026-07-05

NVD

CVE-2026-23421

EUVD

EUVD-2026-18639

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	6.18
linux	linux_kernel	From 6.18.1 (inc) to 6.18.17 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.7 (exc)
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version that includes the fix for the drm/xe/configfs memory leak issue. This fix ensures that the ctx_restore_mid_bb memory is properly freed when the configfs device is removed, preventing memory leaks.

If updating immediately is not possible, avoid removing the configfs device related to drm/xe until a patch is applied, as the vulnerability occurs during device release.

Executive Summary

This vulnerability is related to the Linux kernel's drm/xe/configfs component. Specifically, it involves improper memory management where a certain allocated memory (ctx_restore_mid_bb) is not freed properly when the configfs device is removed. The function wa_bb_store() allocates this memory, but the release function xe_config_device_release() only frees a different memory allocation (ctx_restore_post_bb), leading to a memory leak.

Impact Analysis

The impact of this vulnerability is a memory leak in the Linux kernel's drm/xe/configfs subsystem. Over time, this could lead to increased memory usage and potentially degrade system performance or stability, especially on systems that frequently add and remove configfs devices.

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