VulnerabilityPublished 1 Jul 2026Updated 30 Oct 2026

CVE-2026-53353: Linux kernel · hsr: Remove WARN_ONCE() in hsr_addr_is_self().

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ff88df6d6a72458e1c4ca0e0342327cafd8317f4 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:49 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Patch: Available – fixed in ff88df6d6a72458e1c4ca0e0342327cafd8317f4, d71bb171661ec0225bf4babdd4d296d744982fb3, afd0f17ca46258cec3a5cc48b8df9327fe772490 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 1 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < ff88df6d6a72458e1c4ca0e0342327cafd8317f4	Fixed in ff88df6d6a72458e1c4ca0e0342327cafd8317f4
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < d71bb171661ec0225bf4babdd4d296d744982fb3	Fixed in d71bb171661ec0225bf4babdd4d296d744982fb3
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < afd0f17ca46258cec3a5cc48b8df9327fe772490	Fixed in afd0f17ca46258cec3a5cc48b8df9327fe772490
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 271355c2ef6171dbc815e7ae653eed63444bbd58	Fixed in 271355c2ef6171dbc815e7ae653eed63444bbd58
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 7610e3298aeb2439caa735131265fb634e0db4ec	Fixed in 7610e3298aeb2439caa735131265fb634e0db4ec
LinuxLinux	Affected ≥ f266a683a4804dc499efc6c2206ef68efed029d0, < 0232b6fcb7615fb7fecfe0727a23065a53e228b8	Fixed in 0232b6fcb7615fb7fecfe0727a23065a53e228b8

AI-suggested

A fix is available and has been applied in the Linux kernel. Users should update to a fixed kernel version containing the patch that removes the WARN_ONCE() in hsr_addr_is_self(). No additional mitigation is necessary as this is not a security vulnerability but a correction of an incorrect warning.

Description

This vulnerability concerns a warning removal in the Linux kernel's HSR (High-availability Seamless Redundancy) network driver. The warning in the function hsr_addr_is_self() was triggered due to an incorrect assumption about the state of hsr->self_node during device removal. The fix removes this warning to prevent misleading kernel warnings during normal device lifecycle operations.

Impact

This issue causes a kernel warning that may be triggered during normal device removal operations, potentially leading to confusion or misinterpretation of kernel logs. There is no indication of a security impact such as privilege escalation, denial of service, or information disclosure. The fix removes the warning to avoid false positives in kernel logs.

Summary

The Linux kernel's HSR network driver contained a WARN_ONCE() call in the hsr_addr_is_self() function that was based on an incorrect assumption. Specifically, hsr->self_node is cleared during hsr_del_self_node(), which is invoked from hsr_dellink(). Since dev->rtnl_link_ops->dellink() is called before unregister_netdevice_many(), there exists a window where the device is visible but hsr->self_node is cleared, causing the warning. The patch removes this WARN_ONCE() call to address the issue reported by syzbot, eliminating the false warning without changing the underlying logic.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Oct 2026, 12:35 UTC

Technical details

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