CVE-2026-53353

Kernel warning via HSR teardown race

Published Jul 1, 2026 · Updated Jul 1, 2026

A teardown race in the Linux kernel HSR subsystem allows local users to trigger a kernel warning by sending traffic to a disappearing device. hsr_addr_is_self() invokes WARN_ONCE after hsr_dellink() clears hsr->self_node but before unregister_netdevice_many() makes the device undiscoverable. Triggering it requires a local user to race HSR device teardown with packet transmission; the record shows a warning and soft-lockup taint.

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

What happened

A teardown race in the Linux kernel HSR subsystem allows local users to trigger a kernel warning by sending traffic to a disappearing device. hsr_addr_is_self() invokes WARN_ONCE after hsr_dellink() clears hsr->self_node but before unregister_netdevice_many() makes the device undiscoverable. Triggering it requires a local user to race HSR device teardown with packet transmission; the record shows a warning and soft-lockup taint.

The record

CVE
CVE-2026-53353
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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=3.17
  2. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <0232b6fcb7615fb7fecfe0727a23065a53e228b8
  3. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <271355c2ef6171dbc815e7ae653eed63444bbd58
  4. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <66a46e22396fd5d09606f37f73643eb20e99aa42
  5. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <afd0f17ca46258cec3a5cc48b8df9327fe772490
  6. Affected versionversion=f266a683a4804dc499efc6c2206ef68efed029d0 <d71bb171661ec0225bf4babdd4d296d744982fb3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.17; version=f266a683a4804dc499efc6c2206ef68efed029d0 <0232b6fcb7615fb7fecfe0727a23065a53e228b8; version=f266a683a4804dc499efc6c2206ef68efed029d0 <271355c2ef6171dbc815e7ae653eed63444bbd58; version=f266a683a4804dc499efc6c2206ef68efed029d0 <66a46e22396fd5d09606f37f73643eb20e99aa42; version=f266a683a4804dc499efc6c2206ef68efed029d0 <afd0f17ca46258cec3a5cc48b8df9327fe772490; version=f266a683a4804dc499efc6c2206ef68efed029d0 <d71bb171661ec0225bf4babdd4d296d744982fb3

Published CVSS scores

5.5NVDCVSS: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 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

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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