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

mediumCVSS 5.5CVE-2026-53353

CSIRTS triage

product: hsrOther

What: This vulnerability involves the removal of WARN_ONCE() in hsr_addr_is_self().
Who is affected: Users of the hsr product may be affected.
Urgency: Remediation is important due to a medium severity rating and a CVSS score of 5.5.
Action: Apply the relevant updates to address this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch hsr

Get an email when a new hsr advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53353

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-533530.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53353	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownMultiple vulnerabilities in Microsoft Azure Linux (July 10, 2026)cert-fr-avis
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownCVE-2026-53353: In the Linux kernel, the following vulnerability has been resolved: hsr: Remove WARN_ONCE() in…nvd

Recent advisories for hsr

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-53353: In the Linux kernel, the following vulnerability has been resolved: hsr: Remove WARN_ONCE() in…nvd · 2026-07-01