Multiple vulnerabilities in the Ubuntu Linux kernel (June 26, 2026)
Multiple vulnerabilities have been discovered in the Ubuntu Linux kernel. Some of them allow an attacker to cause privilege escalation, a breach of data confidentiality, and a security policy bypass.
CSIRTS triage
- What
- Multiple vulnerabilities have been discovered in the Ubuntu Linux kernel.
- Who is affected
- Deployments of the Ubuntu Linux kernel are affected.
- Urgency
- Remediation is urgent due to the potential for exploitation and the severity of the vulnerabilities.
- Action
- Apply the latest security updates for the Ubuntu Linux kernel.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0806/
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-2026-430780.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
- Low exploitation riskCVE-2026-473290.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
- Low exploitation riskCVE-2026-473300.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
- Exploitation likely imminentCVE-2026-43284EPSS puts this in the most-targeted tier (93.2% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.
- Exploitation likely imminentCVE-2026-31431EPSS puts this in the most-targeted tier (96.3% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.
- Low exploitation riskCVE-2026-430330.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
- Low exploitation riskCVE-2026-435030.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
- Exploitation likely imminentCVE-2026-43500EPSS puts this in the most-targeted tier (92.8% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.
- Low exploitation riskCVE-2026-473280.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
- Low exploitation riskCVE-2026-315330.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.
Referenced CVEs
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [medium] Linux Kernel: Vulnerability allows unspecified attackcert-bund
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
- medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
- high[UPDATE] [high] Linux Kernel (Dirty Frag): Multiple vulnerabilities allow gaining administrator rightscert-bund
- medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
- medium[UPDATE] [medium] Linux Kernel: Vulnerability Allows Bypassing Security Measurescert-bund
- high[UPDATE] [high] Linux Kernel (Fragnesia): Vulnerability Allows Gaining Administrator Rightscert-bund
- high[UPDATE] [high] Linux Kernel: Vulnerability allows gaining administrator rightscert-bund
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilities enable denial of servicecert-bund
- high[UPDATE] [high] Linux Kernel: Vulnerability allows privilege escalationcert-bund
- unknownUSN-8530-1: Linux kernel (AWS) vulnerabilitiesubuntu
- unknownUSN-8529-1: Linux kernel vulnerabilitiesubuntu
Recent advisories for Ubuntu 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.
- unknownMultiple vulnerabilities in Ubuntu Linux kernel (July 10, 2026)cert-fr-avis · 2026-07-10
- unknownMultiple vulnerabilities in Ubuntu Linux kernel (July 3, 2026)cert-fr-avis · 2026-07-03
- unknownUbuntu Linux Kernel Multiple Vulnerabilitieshkcert · 2026-07-02
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