CVE-2024-53216

Kernel use-after-free via premature export release

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux nfsd export cache allows local users to trigger unsafe kernel memory access through procfs reads. When c_show or e_show drops the final cache_head reference, svc_export_put frees ex_uuid before the show routine finishes reading it, while path_put can also sleep inside an RCU read-side critical section. Access requires a local low-privileged account and concurrent export-cache teardown; successful triggering can expose stale kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux nfsd export cache allows local users to trigger unsafe kernel memory access through procfs reads. When c_show or e_show drops the final cache_head reference, svc_export_put frees ex_uuid before the show routine finishes reading it, while path_put can also sleep inside an RCU read-side critical section. Access requires a local low-privileged account and concurrent export-cache teardown; successful triggering can expose stale kernel memory or crash the system.

The record

CVE
CVE-2024-53216
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.20
  2. Affected versionversion=9ceddd9da13434a5906255c0fc528c385aded283 <2e4854599200f4d021df8ae17e69221d7c149f3e
  3. Affected versionversion=9ceddd9da13434a5906255c0fc528c385aded283 <ad4363a24a5746b257c0beb5d8cc68f9b62c173f
  4. Affected versionversion=9ceddd9da13434a5906255c0fc528c385aded283 <bd8524148dd8c123334b066faa90590ba2ef8e6f
  5. Affected versionversion=9ceddd9da13434a5906255c0fc528c385aded283 <f8c989a0c89a75d30f899a7cabdc14d72522bb8d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=9ceddd9da13434a5906255c0fc528c385aded283 <2e4854599200f4d021df8ae17e69221d7c149f3e; version=9ceddd9da13434a5906255c0fc528c385aded283 <ad4363a24a5746b257c0beb5d8cc68f9b62c173f; version=9ceddd9da13434a5906255c0fc528c385aded283 <bd8524148dd8c123334b066faa90590ba2ef8e6f; version=9ceddd9da13434a5906255c0fc528c385aded283 <f8c989a0c89a75d30f899a7cabdc14d72522bb8d

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS: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

No sourced classifications are available.

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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