CVE-2023-52909Network attack vector

Remote kernel crash via NFSv4 open-file race

Published Aug 21, 2024 · Updated Aug 5, 2026

A race in the Linux kernel 5.19 through 6.1.6 NFSv4 server allows remote attackers to crash the kernel via concurrent OPEN requests. The nfsd4_open path can clear NFSD_FILE_PENDING while nf_file remains null, allowing another task to dereference it; it can also overwrite an existing file pointer and leak its reference. The NFSv4 export must be reachable, and successful triggering causes an oops and service interruption without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in the Linux kernel 5.19 through 6.1.6 NFSv4 server allows remote attackers to crash the kernel via concurrent OPEN requests. The nfsd4_open path can clear NFSD_FILE_PENDING while nf_file remains null, allowing another task to dereference it; it can also overwrite an existing file pointer and leak its reference. The NFSv4 export must be reachable, and successful triggering causes an oops and service interruption without reported data disclosure or modification.

The record

CVE
CVE-2023-52909
Published
Aug 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 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=106331a12b0fa5afa6995b1f9ebb03ddcaac6915 <0b778361998d6c6356b8d2fc7ddf025fb3224654
  2. Affected versionversion=5.19
  3. Affected versionversion=c20097329d2c196b818c4666c7820c1378d69d61 <45c08a752982116f3287afcd1bd9c50f4fab0c28
  4. Affected versionversion=fb70bf124b051d4ded4ce57511dfec6d3ebf2b43 <0b3a551fa58b4da941efeb209b3770868e2eddd7
  5. Affected versionversion=fb70bf124b051d4ded4ce57511dfec6d3ebf2b43 <973acfdfe90c8a4e58ade97ff0653a498531ff2e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=106331a12b0fa5afa6995b1f9ebb03ddcaac6915 <0b778361998d6c6356b8d2fc7ddf025fb3224654; version=5.19; version=c20097329d2c196b818c4666c7820c1378d69d61 <45c08a752982116f3287afcd1bd9c50f4fab0c28; version=fb70bf124b051d4ded4ce57511dfec6d3ebf2b43 <0b3a551fa58b4da941efeb209b3770868e2eddd7; version=fb70bf124b051d4ded4ce57511dfec6d3ebf2b43 <973acfdfe90c8a4e58ade97ff0653a498531ff2e

Published CVSS scores

7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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