[UPDATE] [high] Linux Kernel: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities allow a local attacker to conduct a Denial of Service attack and escalate privileges.

Who is affected

Local users of the Linux Kernel.

Urgency

Remediation is critical due to the high severity of potential Denial of Service and privilege escalation, although exploitation has not been reported.

Action

Apply the latest security updates to the Linux Kernel.

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

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-07-02

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-0309

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-2024-579500.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216870.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216880.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216890.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216900.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216910.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216920.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2025-216930.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• highCVE-2025-21693: mm: zswap: properly synchronize freeing resources during CPU hotunplugmsrc
• unknownMultiple vulnerabilities in Red Hat Linux kernel (July 10, 2026)cert-fr-avis

Recent advisories for Linux Kernel

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.

• unknownUSN-8659-4: Linux kernel (Oracle) vulnerabilityubuntu · 2026-08-26
• unknownUSN-8666-2: Linux kernel (Azure) vulnerabilitiesubuntu · 2026-08-25
• unknownUSN-8630-5: Linux kernel (Raspberry Pi) vulnerabilitiesubuntu · 2026-08-25
• unknownUSN-8658-3: Linux kernel vulnerabilitiesubuntu · 2026-08-25
• unknownUSN-8643-4: Linux kernel vulnerabilitiesubuntu · 2026-08-25
• unknownUSN-8659-3: Linux kernel (Azure) vulnerabilityubuntu · 2026-08-25

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