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CVE Record

CVE-2024-42079: gfs2: Fix NULL pointer dereference in gfs2_log_flush

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).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-42079 is a Linux kernel flaw in the GFS2 filesystem path. A race during unmount can cause a NULL pointer dereference, likely leading to a kernel crash or service interruption. The sources do not show active exploitation or a CVSS score.

Executive priority

Treat as a targeted reliability risk for Linux GFS2 environments. Patch during normal vulnerability maintenance, escalating priority for clustered storage or systems where kernel crashes would cause operational disruption.

Technical view

The issue is in gfs2_log_flush. Outstanding glock work can race with unmount, leaving sdp->sd_jdesc NULL while gfs2_log_flush dereferences it. The upstream fix sets sd_jdesc to NULL under the log flush lock and checks it before dereference.

Likely exposure

Exposure is most relevant to Linux systems using GFS2, especially clustered or shared-storage deployments. Systems not using GFS2 are less likely to be practically exposed, but kernel package status still needs inventory validation.

Exploitation context

The provided sources do not indicate KEV listing, public exploitation, exploit maturity, or remote attack details. Evidence supports a race-condition crash scenario, not confirmed code execution or active exploitation.

Researcher notes

The source evidence is limited to the kernel fix description, affected-version metadata, stable commit references, and a Siemens advisory. No CVSS, CWE, exploit status, or detailed product impact is provided in the bundle.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • Prioritize systems using GFS2 or clustered shared storage.
  • Check Siemens guidance if Siemens products are in scope.
  • If patches are unavailable, monitor vendor advisories for supported mitigation guidance.

Validation and detection

  • Inventory Linux kernel versions across affected assets.
  • Confirm whether GFS2 is enabled or mounted on each system.
  • Compare installed kernels against vendor fixed versions or stable commits.
  • Review logs for kernel crashes around GFS2 unmount activity.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-42079 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
3ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux82218943058d5e3fe692a38b5a549479738dab33, 82218943058d5e3fe692a38b5a549479738dab33, 82218943058d5e3fe692a38b5a549479738dab33, 82218943058d5e3fe692a38b5a549479738dab33, 82218943058d5e3fe692a38b5a549479738dab33unaffected
LinuxLinux5.12, 0, 5.15.200, 6.1.162, 6.6.37, 6.9.8, 6.10affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.