CVE-2025-71097

Denial of service via stale nexthop references

Published Jan 13, 2026 · Updated Jan 13, 2026

Denial of service in the Linux kernel's IPv4 routing code allows local users to prevent network-device removal through error routes. fib_table_flush() skips error routes outside namespace teardown, leaving deleted nexthop objects and their devices referenced. Reachability requires local route-management privileges; IPv6 is unaffected, and the retained reference blocks device teardown.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel's IPv4 routing code allows local users to prevent network-device removal through error routes. fib_table_flush() skips error routes outside namespace teardown, leaving deleted nexthop objects and their devices referenced. Reachability requires local route-management privileges; IPv6 is unaffected, and the retained reference blocks device teardown.

The record

CVE
CVE-2025-71097
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

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

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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=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <30386e090c49e803c0616a7147e43409c32a2b0e
  2. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <5979338c83012110ccd45cae6517591770bfe536
  3. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <ac782f4e3bfcde145b8a7f8af31d9422d94d172a
  4. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <e3fc381320d04e4a74311e576a86cac49a16fc43
  5. Affected versionversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <ee4183501ea556dca31f5ffd8690aa9fd25b609f
  6. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <30386e090c49e803c0616a7147e43409c32a2b0e; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <5979338c83012110ccd45cae6517591770bfe536; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <ac782f4e3bfcde145b8a7f8af31d9422d94d172a; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <e3fc381320d04e4a74311e576a86cac49a16fc43; version=493ced1ac47c48bb86d9d4e8e87df8592be85a0e <ee4183501ea556dca31f5ffd8690aa9fd25b609f; version=5.3

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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