CVE-2024-36947

Local denial of service via qibfs dentry leak

Published May 30, 2024 · Updated May 11, 2026

Memory leakage in Linux qibfs from 5.13 before branch-specific fixes allows local users to exhaust kernel memory through qibfs teardown. In drivers/infiniband/hw/qib/qib_fs.c, a dcache lookup reference passed to simple_recursive_removal() is not balanced with dput(), so each affected removal retains a dentry reference. Reachability requires local low-privileged access and an active qibfs instance; sustained triggering can hang or crash the host as kernel memory is depleted.

CVSS severity5.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in Linux qibfs from 5.13 before branch-specific fixes allows local users to exhaust kernel memory through qibfs teardown. In drivers/infiniband/hw/qib/qib_fs.c, a dcache lookup reference passed to simple_recursive_removal() is not balanced with dput(), so each affected removal retains a dentry reference. Reachability requires local low-privileged access and an active qibfs instance; sustained triggering can hang or crash the host as kernel memory is depleted.

The record

CVE
CVE-2024-36947
Published
May 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 2024CVE 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=5.13
  2. Affected versionversion=e41d237818598c0b17458b4d0416b091a7959e55 <02ee394a5d899d9bd2f0759382e9481cab6166f8
  3. Affected versionversion=e41d237818598c0b17458b4d0416b091a7959e55 <24dd9b08df718f20ccf2dd1519909fefd8c233ee
  4. Affected versionversion=e41d237818598c0b17458b4d0416b091a7959e55 <aa23317d0268b309bb3f0801ddd0d61813ff5afb
  5. Affected versionversion=e41d237818598c0b17458b4d0416b091a7959e55 <bd8f78c71defbcb7a9ed331e7f287507df972b00
  6. Affected versionversion=e41d237818598c0b17458b4d0416b091a7959e55 <db71ca93259dd1078bcfea3afafde2143cfc2da7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=e41d237818598c0b17458b4d0416b091a7959e55 <02ee394a5d899d9bd2f0759382e9481cab6166f8; version=e41d237818598c0b17458b4d0416b091a7959e55 <24dd9b08df718f20ccf2dd1519909fefd8c233ee; version=e41d237818598c0b17458b4d0416b091a7959e55 <aa23317d0268b309bb3f0801ddd0d61813ff5afb; version=e41d237818598c0b17458b4d0416b091a7959e55 <bd8f78c71defbcb7a9ed331e7f287507df972b00; version=e41d237818598c0b17458b4d0416b091a7959e55 <db71ca93259dd1078bcfea3afafde2143cfc2da7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
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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