NULL Pointer Dereference in GFS2 Filesystem

Publication date: 2026-06-24

Last updated on: 2026-07-21

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: prevent NULL pointer dereference during unmount When flushing out outstanding glock work during an unmount, gfs2_log_flush() can be called when sdp->sd_jdesc has already been deallocated and sdp->sd_jdesc is NULL. Commit 35264909e9d1 ("gfs2: Fix NULL pointer dereference in gfs2_log_flush") added a check for that to gfs2_log_flush() itself, but it missed the sdp->sd_jdesc dereference in gfs2_log_release(). Fix that.

CVSS Scores

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Meta Information

Published

2026-06-24

Last Modified

2026-07-21

Generated

2026-08-04

AI Q&A

2026-06-24

EPSS Evaluated

2026-08-02

NVD

CVE-2026-53048

EUVD

EUVD-2026-38916

Affected Vendors & Products

Vendor	Product	Version / Range
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 6.1.162 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 5.15.200 (inc) to 5.15.209 (exc)
linux	linux_kernel	From 6.6.37 (inc) to 6.6.141 (exc)
linux	linux_kernel	From 6.9.8 (inc) to 6.12.91 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's gfs2 filesystem code. It involves a NULL pointer dereference during the unmount process. Specifically, when flushing outstanding glock work during unmount, the function gfs2_log_flush() can be called after the sdp->sd_jdesc pointer has already been deallocated and set to NULL. Although a previous fix added a check in gfs2_log_flush() to prevent this, it missed a similar dereference in the gfs2_log_release() function, which this vulnerability addresses.

Impact Analysis

The vulnerability can cause a NULL pointer dereference during the unmounting of the gfs2 filesystem, which may lead to a kernel crash or system instability. This can result in denial of service or unexpected system behavior when the affected code path is executed.

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