CVE-2023-52483

Local code execution via unlocked MCTP route lookup

Published Feb 29, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel MCTP routing 5.15 through 6.6-rc5 allows local users to execute code through a route race. mctp_route_lookup and mctp_route_lookup_null traverse the route list without an RCU read lock, letting concurrent deletion free a route before its output pointer is used. An unprivileged user can create a user and network namespace, drive lookups while deleting MCTP routes, and gain kernel-level control or crash the host without user interaction.

CVSS severity7.8
High
EPSS probability0.23%
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

Use-after-free in Linux kernel MCTP routing 5.15 through 6.6-rc5 allows local users to execute code through a route race. mctp_route_lookup and mctp_route_lookup_null traverse the route list without an RCU read lock, letting concurrent deletion free a route before its output pointer is used. An unprivileged user can create a user and network namespace, drive lookups while deleting MCTP routes, and gain kernel-level control or crash the host without user interaction.

The record

CVE
CVE-2023-52483
Published
Feb 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 29, 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=5.15
  2. Affected versionversion=889b7da23abf92faf34491df95733bda63639e32 <1db0724a01b558feb1ecae551782add1951a114a
  3. Affected versionversion=889b7da23abf92faf34491df95733bda63639e32 <2405f64a95a7a094eb24cba9bcfaffd1ea264de4
  4. Affected versionversion=889b7da23abf92faf34491df95733bda63639e32 <5093bbfc10ab6636b32728e35813cbd79feb063c
  5. Affected versionversion=889b7da23abf92faf34491df95733bda63639e32 <6c52b12159049046483fdb0c411a0a1869c41a67

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=889b7da23abf92faf34491df95733bda63639e32 <1db0724a01b558feb1ecae551782add1951a114a; version=889b7da23abf92faf34491df95733bda63639e32 <2405f64a95a7a094eb24cba9bcfaffd1ea264de4; version=889b7da23abf92faf34491df95733bda63639e32 <5093bbfc10ab6636b32728e35813cbd79feb063c; version=889b7da23abf92faf34491df95733bda63639e32 <6c52b12159049046483fdb0c411a0a1869c41a67

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

CWE-416Use After Free
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

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