CVE-2024-56779Network attack vector

Remote service interruption via concurrent OPEN memory leak

Published Jan 8, 2025 · Updated Aug 5, 2026

Memory leak in Linux kernel nfsd allows remote attackers to exhaust kernel memory through concurrent NFSv4 OPEN requests. find_or_alloc_open_stateowner removes an unconfirmed owner from lookup visibility while another nfsd thread can still attach state, leaving associated kernel objects unreachable. The race requires concurrent requests for the same fresh open owner from an NFS client allowed by the export; repeated wins can prevent unmounting or crash the server.

CVSS severity9.8
Critical
EPSS probability0.53%
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

Memory leak in Linux kernel nfsd allows remote attackers to exhaust kernel memory through concurrent NFSv4 OPEN requests. find_or_alloc_open_stateowner removes an unconfirmed owner from lookup visibility while another nfsd thread can still attach state, leaving associated kernel objects unreachable. The race requires concurrent requests for the same fresh open owner from an NFS client allowed by the export; repeated wins can prevent unmounting or crash the server.

The record

CVE
CVE-2024-56779
Published
Jan 8, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 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=3.17
  2. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <0ab0a3ad24e970e894abcac58f85c332d1726749
  3. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <2d505a801e57428057563762f67a5a62009b2600
  4. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <37dfc81266d3a32294524bfadd3396614f8633ee
  5. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <45abb68c941ebc9a35c6d3a7b08196712093c636
  6. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <6f73f920b7ad0084373e46121d7ac34117aed652
  7. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <98100e88dd8865999dc6379a3356cd799795fe7b
  8. Affected versionversion=3234975f477f746c22d076ea178a79ea104b2ca7 <a85364f0d30dee01c5d5b4afa55a9629a8f36d8e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=3234975f477f746c22d076ea178a79ea104b2ca7 <0ab0a3ad24e970e894abcac58f85c332d1726749; version=3234975f477f746c22d076ea178a79ea104b2ca7 <2d505a801e57428057563762f67a5a62009b2600; version=3234975f477f746c22d076ea178a79ea104b2ca7 <37dfc81266d3a32294524bfadd3396614f8633ee; version=3234975f477f746c22d076ea178a79ea104b2ca7 <45abb68c941ebc9a35c6d3a7b08196712093c636; version=3234975f477f746c22d076ea178a79ea104b2ca7 <6f73f920b7ad0084373e46121d7ac34117aed652; version=3234975f477f746c22d076ea178a79ea104b2ca7 <98100e88dd8865999dc6379a3356cd799795fe7b; version=3234975f477f746c22d076ea178a79ea104b2ca7 <a85364f0d30dee01c5d5b4afa55a9629a8f36d8e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

CWE-401Missing Release of Memory after Effective Lifetime
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