CVE-2024-39500

Kernel compromise via sockmap reference-count race

Published Jul 12, 2024 · Updated Aug 5, 2026

A race condition in Linux kernel sockmap code allows local users to compromise the kernel through concurrent socket-map operations. sock_map_close can observe a null sk_psock after its final reference is released but before sk_psock_drop restores the socket callbacks. A local low-privileged user with sockmap access can race map-element deletion against socket insertion and close, exposing kernel confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel sockmap code allows local users to compromise the kernel through concurrent socket-map operations. sock_map_close can observe a null sk_psock after its final reference is released but before sk_psock_drop restores the socket callbacks. A local low-privileged user with sockmap access can race map-element deletion against socket insertion and close, exposing kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2024-39500
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 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=5.10.248 <5.11
  2. Affected versionversion=5.13
  3. Affected versionversion=aadb2bb83ff789de63b48b4edeab7329423a50d3 <3627605de498639a3c586c8684d12c89cba11073
  4. Affected versionversion=aadb2bb83ff789de63b48b4edeab7329423a50d3 <4959ffc65a0e94f8acaac20deac49f89e6ded52d
  5. Affected versionversion=aadb2bb83ff789de63b48b4edeab7329423a50d3 <4b4647add7d3c8530493f7247d11e257ee425bf0
  6. Affected versionversion=aadb2bb83ff789de63b48b4edeab7329423a50d3 <5eabdf17fed2ad41b836bb4055ec36d95e512c50
  7. Affected versionversion=aadb2bb83ff789de63b48b4edeab7329423a50d3 <e946428439a0d2079959f5603256ac51b6047017
  8. Affected versionversion=c4896f5fd83664a50ac4fef4131a265d15734e5a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.248 <5.11; version=5.13; version=aadb2bb83ff789de63b48b4edeab7329423a50d3 <3627605de498639a3c586c8684d12c89cba11073; version=aadb2bb83ff789de63b48b4edeab7329423a50d3 <4959ffc65a0e94f8acaac20deac49f89e6ded52d; version=aadb2bb83ff789de63b48b4edeab7329423a50d3 <4b4647add7d3c8530493f7247d11e257ee425bf0; version=aadb2bb83ff789de63b48b4edeab7329423a50d3 <5eabdf17fed2ad41b836bb4055ec36d95e512c50; version=aadb2bb83ff789de63b48b4edeab7329423a50d3 <e946428439a0d2079959f5603256ac51b6047017; version=c4896f5fd83664a50ac4fef4131a265d15734e5a

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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

T1068Exploitation for Privilege Escalation

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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