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CVE-2026-53249: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

highCVSS 7CVE-2026-53249

CSIRTS triage

vendor: Linuxproduct: Linux KernelOther
What
Restrictions on IPOPT_SSRR and IPOPT_LSRR options are necessary.
Who is affected
Deployments of the affected Linux kernel versions.
Urgency
Remediation is important due to the high severity rating.
Action
Update to the patched version of the Linux kernel.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53249

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-53249coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for ipv4

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.

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