CVE-2024-49870

Service interruption via unreleased cachefiles dentry

Published Oct 21, 2024 · Updated May 11, 2026

Resource leakage in Linux kernel 5.17 through affected 6.11 releases allows local users to disrupt cachefiles backend unmounting. A lookup/cull race lets cachefiles_look_up_object() retain the dentry reference returned by lookup_positive_unlocked() when cachefiles_open_file() rejects an inode marked S_KERNEL_FILE. Exploitation requires local low-privileged access and the concurrent race; the retained dentry triggers a kernel warning and prevents a clean backend unmount without exposing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in Linux kernel 5.17 through affected 6.11 releases allows local users to disrupt cachefiles backend unmounting. A lookup/cull race lets cachefiles_look_up_object() retain the dentry reference returned by lookup_positive_unlocked() when cachefiles_open_file() rejects an inode marked S_KERNEL_FILE. Exploitation requires local low-privileged access and the concurrent race; the retained dentry triggers a kernel warning and prevents a clean backend unmount without exposing or modifying data.

The record

CVE
CVE-2024-49870
Published
Oct 21, 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. Oct 21, 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=1f08c925e7a38002bde509e66f6f891468848511 <7fa2382f97421978514a419c93054eca69f5247b
  2. Affected versionversion=1f08c925e7a38002bde509e66f6f891468848511 <c7d10fa7d7691558ff967668494672415f5fa151
  3. Affected versionversion=1f08c925e7a38002bde509e66f6f891468848511 <d32ff64c872d7e08e893c32ba6a2374583444410
  4. Affected versionversion=1f08c925e7a38002bde509e66f6f891468848511 <da6ef2dffe6056aad3435e6cf7c6471c2a62187c
  5. Affected versionversion=1f08c925e7a38002bde509e66f6f891468848511 <e4a28489b310339b2b8187bec0a437709be551c1
  6. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1f08c925e7a38002bde509e66f6f891468848511 <7fa2382f97421978514a419c93054eca69f5247b; version=1f08c925e7a38002bde509e66f6f891468848511 <c7d10fa7d7691558ff967668494672415f5fa151; version=1f08c925e7a38002bde509e66f6f891468848511 <d32ff64c872d7e08e893c32ba6a2374583444410; version=1f08c925e7a38002bde509e66f6f891468848511 <da6ef2dffe6056aad3435e6cf7c6471c2a62187c; version=1f08c925e7a38002bde509e66f6f891468848511 <e4a28489b310339b2b8187bec0a437709be551c1; version=5.17

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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