CVE-2024-56713Public exploit

Networking hang via unreleased RTNL lock

Published Dec 29, 2024 · Updated May 11, 2026

Availability flaw in Linux kernel 6.10 through 6.12.6 allows local users to hang networking through the netdevsim pp_hold file. The nsim_pp_hold_write() handler returns early while retaining the RTNL mutex when the requested Boolean already matches the page state, and it also masks allocation or interface-down errors. Reaching this file-write path requires local elevated access and an enabled netdevsim instance; a successful trigger can stall operations needing RTNL.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in Linux kernel 6.10 through 6.12.6 allows local users to hang networking through the netdevsim pp_hold file. The nsim_pp_hold_write() handler returns early while retaining the RTNL mutex when the requested Boolean already matches the page state, and it also masks allocation or interface-down errors. Reaching this file-write path requires local elevated access and an enabled netdevsim instance; a successful trigger can stall operations needing RTNL.

The record

CVE
CVE-2024-56713
Published
Dec 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 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

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=1580cbcbfe770b0a7fb76735c1a601483335c1c2 <5c553262f063b3bf85df3b22a9818a8d92510f4d
  2. Affected versionversion=1580cbcbfe770b0a7fb76735c1a601483335c1c2 <b9b8301d369b4c876de5255dbf067b19ba88ac71
  3. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1580cbcbfe770b0a7fb76735c1a601483335c1c2 <5c553262f063b3bf85df3b22a9818a8d92510f4d; version=1580cbcbfe770b0a7fb76735c1a601483335c1c2 <b9b8301d369b4c876de5255dbf067b19ba88ac71; version=6.10

Published CVSS scores

5.6SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1SUSECVSS:3.1/AV:L/AC:H/PR:H/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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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