CVE-2024-56635

Kernel disclosure and crash via netns race

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel network link handling allows local users to disclose kernel memory or crash the system. default_operstate() reads a device hash through a namespace pointer after device and namespace teardown race past RTNL unlocking. An unprivileged local user can create user and network namespaces, control both sides of the rtnetlink race, and repeatedly trigger disclosure, kernel-state corruption, or a panic.

CVSS severity7.8
High
EPSS probability0.19%
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 Linux kernel network link handling allows local users to disclose kernel memory or crash the system. default_operstate() reads a device hash through a namespace pointer after device and namespace teardown race past RTNL unlocking. An unprivileged local user can create user and network namespaces, control both sides of the rtnetlink race, and repeatedly trigger disclosure, kernel-state corruption, or a panic.

The record

CVE
CVE-2024-56635
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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

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=6.2
  2. Affected versionversion=8c55facecd7ade835287298ce325f930d888d8ec <316183d58319f191e16503bc2dffa156c4442df2
  3. Affected versionversion=8c55facecd7ade835287298ce325f930d888d8ec <3265aab0736f78bb218200b06b1abb525c316269
  4. Affected versionversion=8c55facecd7ade835287298ce325f930d888d8ec <750e51603395e755537da08f745864c93e3ce741

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=8c55facecd7ade835287298ce325f930d888d8ec <316183d58319f191e16503bc2dffa156c4442df2; version=8c55facecd7ade835287298ce325f930d888d8ec <3265aab0736f78bb218200b06b1abb525c316269; version=8c55facecd7ade835287298ce325f930d888d8ec <750e51603395e755537da08f745864c93e3ce741

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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