CVE-2026-80995

Local system crash via MCTP device race

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in the Linux kernel MCTP routing code in 7.1 allows local users to crash the system through AF_MCTP packet handling. mctp_route_lookup() reads rt->dev->addrs[0] after concurrent device teardown frees the address array because it holds no device reference. An unprivileged AF_MCTP user needs no CAP_NET_RAW, and a successful race causes invalid kernel memory access and a system crash.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
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 the Linux kernel MCTP routing code in 7.1 allows local users to crash the system through AF_MCTP packet handling. mctp_route_lookup() reads rt->dev->addrs[0] after concurrent device teardown frees the address array because it holds no device reference. An unprivileged AF_MCTP user needs no CAP_NET_RAW, and a successful race causes invalid kernel memory access and a system crash.

The record

CVE
CVE-2026-80995
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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?

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  1. Affected versionversion=22cb45afd221b9e4f2a1dcc74a8ff645b7293aa1 <408da1df18116c971c3392e21e50586688cd3fbf
  2. Affected versionversion=22cb45afd221b9e4f2a1dcc74a8ff645b7293aa1 <cc561f8af25586300c2f9d285babb163b866b293
  3. Affected versionversion=7.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=22cb45afd221b9e4f2a1dcc74a8ff645b7293aa1 <408da1df18116c971c3392e21e50586688cd3fbf; version=22cb45afd221b9e4f2a1dcc74a8ff645b7293aa1 <cc561f8af25586300c2f9d285babb163b866b293; version=7.1

Published CVSS scores

No CVSS assessment is available in this record.

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-416Use After Free
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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