CVE-2026-53048

Kernel crash via stale journal descriptor dereference

Published Jun 24, 2026 · Updated Jun 24, 2026

NULL pointer dereference in Linux Kernel GFS2 allows local users to crash the system while unmounting a GFS2 filesystem. During unmount, gfs2_log_flush() can run after sd_jdesc is freed, and gfs2_log_release() dereferences sd_jdesc->jd_blocks without a NULL check. Triggering the path requires CAP_SYS_ADMIN in the initial user namespace and a mounted GFS2 filesystem; the bounded impact is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel GFS2 allows local users to crash the system while unmounting a GFS2 filesystem. During unmount, gfs2_log_flush() can run after sd_jdesc is freed, and gfs2_log_release() dereferences sd_jdesc->jd_blocks without a NULL check. Triggering the path requires CAP_SYS_ADMIN in the initial user namespace and a mounted GFS2 filesystem; the bounded impact is a kernel crash.

The record

CVE
CVE-2026-53048
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3429ef5f50909cee9e498c50f0c499b9397116ce <233a0945a4b1dbe3f38c30afb7d05b76c67f1193
  2. Affected versionversion=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <74b4dbb946060a3233604d91859a9abd3708141d
  3. Affected versionversion=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <abd73229f0e886a91a16ea781ab656bd9b4d1ee8
  4. Affected versionversion=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <d8ffae016c4a78693fe1283335d0b6833a9c1366
  5. Affected versionversion=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <e15f16761594e80b15776980b27c35477655a135
  6. Affected versionversion=5.15.200 <5.15.209
  7. Affected versionversion=5f6a84cfb33b34610623857bd93919dcb661e29b <2fc4c868c9060f424fd4a7cacb0aec5082aba4de
  8. Affected versionversion=6.10
  9. Affected versionversion=6.1.162 <6.1.175
  10. Affected versionversion=6.6.37 <6.6.141
  11. Affected versionversion=6.9.8 <6.10
  12. Affected versionversion=c3c5cfa3170c0940bc66a142859caac07d19b9d6 <cec55674354794eddb80b914f73a6bf9b7fc304a
  13. Affected versionversion=f54f9d5368a4e92ede7dd078a62788dae3a7c6ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3429ef5f50909cee9e498c50f0c499b9397116ce <233a0945a4b1dbe3f38c30afb7d05b76c67f1193; version=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <74b4dbb946060a3233604d91859a9abd3708141d; version=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <abd73229f0e886a91a16ea781ab656bd9b4d1ee8; version=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <d8ffae016c4a78693fe1283335d0b6833a9c1366; version=35264909e9d1973ab9aaa2a1b07cda70f12bb828 <e15f16761594e80b15776980b27c35477655a135; version=5.15.200 <5.15.209; version=5f6a84cfb33b34610623857bd93919dcb661e29b <2fc4c868c9060f424fd4a7cacb0aec5082aba4de; version=6.10; version=6.1.162 <6.1.175; version=6.6.37 <6.6.141; version=6.9.8 <6.10; version=c3c5cfa3170c0940bc66a142859caac07d19b9d6 <cec55674354794eddb80b914f73a6bf9b7fc304a; version=f54f9d5368a4e92ede7dd078a62788dae3a7c6ef

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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