CVE-2025-71080Network attack vector

Remote system crash via IPv6 route race

Published Jan 13, 2026 · Updated Jan 13, 2026

Reachable assertion in the Linux Kernel allows remote attackers to crash PREEMPT_RT systems by sending IPv6 traffic that triggers a route race. In rt6_make_pcpu_route(), a task that loses the cmpxchg race after another same-CPU task installs rt6i_pcpu treats the valid collision as BUG_ON(prev). The path is reachable through unauthenticated IPv6 routing only on PREEMPT_RT kernels, where preemption between lookup and installation can panic the kernel and interrupt the host.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux Kernel allows remote attackers to crash PREEMPT_RT systems by sending IPv6 traffic that triggers a route race. In rt6_make_pcpu_route(), a task that loses the cmpxchg race after another same-CPU task installs rt6i_pcpu treats the valid collision as BUG_ON(prev). The path is reachable through unauthenticated IPv6 routing only on PREEMPT_RT kernels, where preemption between lookup and installation can panic the kernel and interrupt the host.

The record

CVE
CVE-2025-71080
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 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=6.12
  2. Affected versionversion=d2d6422f8bd17c6bb205133e290625a564194496 <1adaea51c61b52e24e7ab38f7d3eba023b2d050d
  3. Affected versionversion=d2d6422f8bd17c6bb205133e290625a564194496 <1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66
  4. Affected versionversion=d2d6422f8bd17c6bb205133e290625a564194496 <787515ccb2292f82eb0876993129154629a49651

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=d2d6422f8bd17c6bb205133e290625a564194496 <1adaea51c61b52e24e7ab38f7d3eba023b2d050d; version=d2d6422f8bd17c6bb205133e290625a564194496 <1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66; version=d2d6422f8bd17c6bb205133e290625a564194496 <787515ccb2292f82eb0876993129154629a49651

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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