Multiple vulnerabilities in the Ubuntu Linux kernel (June 26, 2026)

unknownpublic exploitCVE-2026-43078 CVE-2026-47329 CVE-2026-47330 CVE-2026-43284 CVE-2026-31431 CVE-2026-43033

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

vendor: Ubuntu product: Linux kernel Privilege escalation Information disclosure Authentication bypass

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

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-06-26
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

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 EPSS-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 EPSS-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 EPSS-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 99.8% of all EPSS-scored CVEs.
Exploitation confirmedCVE-2026-31431Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-430330.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-435030.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
Exploitation likely imminentCVE-2026-43500EPSS puts this in the most-targeted tier (92.9% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 99.8% of all EPSS-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 EPSS-scored CVEs.
Low exploitation riskCVE-2026-315330.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-43078	coverage & exploitation status	NVD · CVE.org
CVE-2026-47329	coverage & exploitation status	NVD · CVE.org
CVE-2026-47330	coverage & exploitation status	NVD · CVE.org
CVE-2026-43284	coverage & exploitation status	NVD · CVE.org
CVE-2026-31431	coverage & exploitation status	NVD · CVE.org
CVE-2026-43033	coverage & exploitation status	NVD · CVE.org
CVE-2026-43503	coverage & exploitation status	NVD · CVE.org
CVE-2026-43500	coverage & exploitation status	NVD · CVE.org
CVE-2026-47328	coverage & exploitation status	NVD · CVE.org
CVE-2026-31533	coverage & exploitation status	NVD · CVE.org
CVE-2026-46323	coverage & exploitation status	NVD · CVE.org
CVE-2026-47332	coverage & exploitation status	NVD · CVE.org
CVE-2026-46000	coverage & exploitation status	NVD · CVE.org
CVE-2026-47334	coverage & exploitation status	NVD · CVE.org
CVE-2026-43077	coverage & exploitation status	NVD · CVE.org
CVE-2026-46300	coverage & exploitation status	NVD · CVE.org
CVE-2026-45998	coverage & exploitation status	NVD · CVE.org
CVE-2026-31504	coverage & exploitation status	NVD · CVE.org
CVE-2026-47327	coverage & exploitation status	NVD · CVE.org
CVE-2026-47326	coverage & exploitation status	NVD · CVE.org
CVE-2026-31419	coverage & exploitation status	NVD · CVE.org
CVE-2026-47337	coverage & exploitation status	NVD · CVE.org
CVE-2026-46333	coverage & exploitation status	NVD · CVE.org
CVE-2026-47333	coverage & exploitation status	NVD · CVE.org
CVE-2026-46028	coverage & exploitation status	NVD · CVE.org
CVE-2026-43494	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
highexploited[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilities enable denial of servicecert-bund
medium[UPDATE] [medium] Linux Kernel: Vulnerability Allows Bypassing Security Measurescert-bund
medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
unknownexploitedDirty Frag and other issues in Amazon Linux kernelsaws
unknownexploitedOngoing updates on Copy.fail and variantsaws
unknownexploitedCVE-2026-31431aws
unknownFragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernelaws
high[UPDATE] [high] Linux Kernel: Vulnerability allows gaining administrator rightscert-bund
unknownMultiple vulnerabilities in Ubuntu Linux kernel (August 14, 2026)cert-fr-avis
unknownexploitedMultiple vulnerabilities in SUSE Linux kernel (August 14, 2026)cert-fr-avis

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 (August 21, 2026)cert-fr-avis · 2026-08-21
unknownMultiple vulnerabilities in Ubuntu Linux kernel (August 14, 2026)cert-fr-avis · 2026-08-14
unknownMultiple vulnerabilities in Ubuntu Linux kernel (August 07, 2026)cert-fr-avis · 2026-08-07
unknownUbuntu Linux Kernel Multiple Vulnerabilitieshkcert · 2026-08-03
unknownMultiple vulnerabilities in Ubuntu Linux kernel (July 31, 2026)cert-fr-avis · 2026-07-31
unknownMultiple vulnerabilities in Ubuntu Linux kernel (July 24, 2026)cert-fr-avis · 2026-07-24