[NEW] [high] libvirt: Vulnerability enables privilege escalation and DoS

highCVE-2026-18917

A local attacker can exploit a vulnerability in libvirt to cause a denial-of-service condition or elevate privileges.

CSIRTS triage

vendor: libvirt product: libvirt Privilege escalation Denial of service

What: A vulnerability in libvirt allows local attackers to cause denial of service or escalate privileges.
Who is affected: Local users on systems running libvirt are affected.
Urgency: High priority; privilege escalation capability warrants immediate remediation.
Action: Update libvirt to a patched version addressing CVE-2026-18917.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-21
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-2026-2954

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-2026-189170.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-18917	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for libvirt

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.

highCVE-2026-18917: A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vuln…nvd · 2026-08-20
medium[NEW] [medium] libvirt: Multiple vulnerabilities allowcert-bund · 2026-08-11
mediumCVE-2026-63623: Libvirt: information disclosure via world-readable storage volume images during clone/convertmsrc · 2026-08-11
lowCVE-2026-61477: Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config di…msrc · 2026-08-11
mediumCVE-2026-18917: Libvirt: integer overflow in nodegetfreepages rpc handler leading to heap buffer overflowmsrc · 2026-08-11
highCVE-2026-63622: A flaw was found in libvirt. A local attacker, specifically a process running as the confined …nvd · 2026-08-10