CVE-2025-40324Network attack vector

Remote service interruption via NFSD tracepoint null dereference

Published Dec 8, 2025 · Updated Aug 5, 2026

Denial of service in affected Linux NFSD versions allows remote attackers to exhaust server threads via a crafted NFSv4 COMPOUND READ. nfsd4_read_release invokes trace_nfsd_read_done after a READ without a filehandle leaves rd_rqstp and rd_fhp null, causing a null dereference. Exposure requires reachable TCP port 2049 and enabled NFSD read tracing; repeated requests exhaust NFSD threads, while panic_on_oops causes a kernel panic.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in affected Linux NFSD versions allows remote attackers to exhaust server threads via a crafted NFSv4 COMPOUND READ. nfsd4_read_release invokes trace_nfsd_read_done after a READ without a filehandle leaves rd_rqstp and rd_fhp null, causing a null dereference. Exposure requires reachable TCP port 2049 and enabled NFSD read tracing; repeated requests exhaust NFSD threads, while panic_on_oops causes a kernel panic.

The record

CVE
CVE-2025-40324
Published
Dec 8, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2025CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15a8b55dbb1ba154d82627547c5761cac884d810 <03524ccff698d4a77d096ed529073d91f5edee5d
  2. Affected versionversion=15a8b55dbb1ba154d82627547c5761cac884d810 <8f244b773c63fa480c9a3bd1ae04f5272f285e89
  3. Affected versionversion=15a8b55dbb1ba154d82627547c5761cac884d810 <a4948875ed0599c037dc438c11891c9012721b1d
  4. Affected versionversion=15a8b55dbb1ba154d82627547c5761cac884d810 <abb1f08a2121dd270193746e43b2a9373db9ad84
  5. Affected versionversion=3d0dcada384af22dec764c8374a2997870ec86ae
  6. Affected versionversion=5.10.220 <5.10.247
  7. Affected versionversion=5.15.154 <5.15.197
  8. Affected versionversion=6.1.24 <6.1.159
  9. Affected versionversion=6.2.11 <6.3
  10. Affected versionversion=6.3
  11. Affected versionversion=65a33135e91e6dd661ecdf1194b9d90c49ae3570 <930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1
  12. Affected versionversion=b11d8162c24af4a351d21e2c804d25ca493305e3 <375fdd8993cecc48afa359728a6e70b280dde1c8
  13. Affected versionversion=b623a8e5d38a69a3ef8644acb1030dd7c7bc28b3 <2ac46606b2cc49e78d8e3d8f2685e79e9ba73020

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=15a8b55dbb1ba154d82627547c5761cac884d810 <03524ccff698d4a77d096ed529073d91f5edee5d; version=15a8b55dbb1ba154d82627547c5761cac884d810 <8f244b773c63fa480c9a3bd1ae04f5272f285e89; version=15a8b55dbb1ba154d82627547c5761cac884d810 <a4948875ed0599c037dc438c11891c9012721b1d; version=15a8b55dbb1ba154d82627547c5761cac884d810 <abb1f08a2121dd270193746e43b2a9373db9ad84; version=3d0dcada384af22dec764c8374a2997870ec86ae; version=5.10.220 <5.10.247; version=5.15.154 <5.15.197; version=6.1.24 <6.1.159; version=6.2.11 <6.3; version=6.3; version=65a33135e91e6dd661ecdf1194b9d90c49ae3570 <930cb4fe3ab4061be31f20ee30bb72a66f7bb6d1; version=b11d8162c24af4a351d21e2c804d25ca493305e3 <375fdd8993cecc48afa359728a6e70b280dde1c8; version=b623a8e5d38a69a3ef8644acb1030dd7c7bc28b3 <2ac46606b2cc49e78d8e3d8f2685e79e9ba73020

Published CVSS scores

7.5kernel.orgCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo