CVE-2025-37983

Service interruption via leaked qibfs dentries

Published May 20, 2025 · Updated May 11, 2026

A memory leak in Linux qibfs 2.6.35 and later allows local users to cause a service interrupt when inode allocation fails. The qibfs_mknod() error path returns after new_inode() fails without calling dput() on the dentry obtained by create_file(). The path requires mounted qibfs activity while the host is sufficiently memory-constrained for inode allocation to fail, and each failure retains one dentry.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in Linux qibfs 2.6.35 and later allows local users to cause a service interrupt when inode allocation fails. The qibfs_mknod() error path returns after new_inode() fails without calling dput() on the dentry obtained by create_file(). The path requires mounted qibfs activity while the host is sufficiently memory-constrained for inode allocation to fail, and each failure retains one dentry.

The record

CVE
CVE-2025-37983
Published
May 20, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.35
  2. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <24faa6ea274a2b96d0a78a0996c3137c2b2a65f0
  3. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <3c2fde33e3e505dfd1a895d1f24bad650c655e14
  4. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <47ab2caba495c1d6a899d284e541a8df656dcfe9
  5. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <545defa656568c74590317cd30068f85134a8216
  6. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5d53e88d8370b9ab14dd830abb410d9a2671edb6
  7. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5e280cce3a29b7fe7b828c6ccd5aa5ba87ceb6b6
  8. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5fe708c5e3c8b2152c6caaa67243e431a5d6cca3
  9. Affected versionversion=f931551bafe1f10ded7f5282e2aa162c267a2e5d <bdb43af4fdb39f844ede401bdb1258f67a580a27

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <24faa6ea274a2b96d0a78a0996c3137c2b2a65f0; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <3c2fde33e3e505dfd1a895d1f24bad650c655e14; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <47ab2caba495c1d6a899d284e541a8df656dcfe9; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <545defa656568c74590317cd30068f85134a8216; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5d53e88d8370b9ab14dd830abb410d9a2671edb6; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5e280cce3a29b7fe7b828c6ccd5aa5ba87ceb6b6; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <5fe708c5e3c8b2152c6caaa67243e431a5d6cca3; version=f931551bafe1f10ded7f5282e2aa162c267a2e5d <bdb43af4fdb39f844ede401bdb1258f67a580a27

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

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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