CVE-2023-2176

Local privilege escalation via stale RDMA tree keys

Published Apr 20, 2023 · Updated May 5, 2025

Out-of-bounds read in Linux Kernel 6.1 RDMA allows local users to crash the system or escalate privileges through route resolution. On an error path, resolve_prepare_src() zeroes an existing destination address instead of restoring it, producing duplicate or mismatched connection-manager tree keys that drive compare_netdev_and_ip() past a slab object. A local low-privileged account that can issue RDMA connection-manager route-resolution requests can trigger a kernel crash; the published assessment also reports privilege escalation.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux Kernel 6.1 RDMA allows local users to crash the system or escalate privileges through route resolution. On an error path, resolve_prepare_src() zeroes an existing destination address instead of restoring it, producing duplicate or mismatched connection-manager tree keys that drive compare_netdev_and_ip() past a slab object. A local low-privileged account that can issue RDMA connection-manager route-resolution requests can trigger a kernel crash; the published assessment also reports privilege escalation.

The record

CVE
CVE-2023-2176
Published
Apr 20, 2023
Updated
May 5, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2023CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record 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=Linux 6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux 6.1

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service
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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