---
id: CVE-2024-42079
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  gfs2: Fix NULL pointer dereference in gfs2_log_flush

  In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush
  lock to provide exclusion against gfs2_log_fl…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  gfs2: Fix NULL pointer dereference in gfs2_log_flush

  In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush
  lock to provide exclusion against gfs2_log_fl…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 6.6.37
  - 'linux_kernel >= 6.7, < 6.9.8'
patched:
  - linux_kernel 6.9.8
published: '2024-07-29'
updated: '2026-07-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-42079'
references:
  - url: 'https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f6a84cfb33b34610623857bd93919dcb661e29b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c3c5cfa3170c0940bc66a142859caac07d19b9d6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00268
epssPercentile: 0.16967
ingestedAt: '2026-07-14T13:36:54.519Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T16:19:17.192306Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

gfs2: Fix NULL pointer dereference in gfs2_log_flush

In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush
lock to provide exclusion against gfs2_log_flush().

In gfs2_log_flush(), check if sdp->sd_jdesc is non-NULL before
dereferencing it.  Otherwise, we could run into a NULL pointer
dereference when outstanding glock work races with an unmount
(glock_work_func -> run_queue -> do_xmote -> inode_go_sync ->
gfs2_log_flush).

## Affected

- `linux_kernel < 6.6.37`
- `linux_kernel >= 6.7, < 6.9.8`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.9.8`