USN-8636-1: Linux kernel vulnerabilities

unknownpublic exploitCVE-2026-31405 CVE-2026-31414 CVE-2026-31501 CVE-2026-31589 CVE-2026-31633 CVE-2026-31636

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - x86 architecture; - InfiniBand drivers; - Media drivers; - Network drivers; - Mellanox network drivers; - Texas Instruments network drivers; - NVME drivers; - File systems infrastructure; - SMB network file system; - IPv4 networking; - Network traffic control; - TCP network protocol; - Locking primitives; - Memory management; - IPv6 networking; - Multipath TCP; - Netfilter; - RxRPC session sockets; - SCTP protocol; - SMC sockets; (CVE-2026-31405, CVE-2026-31414, CVE-2026-31501, CVE-2026-31589, CVE-2026-31633, CVE-2026-31636, CVE-2026-31705, CVE-2026-43198, CVE-2026-43379, CVE-2026-43465, CVE-2026-43499, CVE-2026-46113, CVE-2026-46137, CVE-2026-46242, CVE-2026-46331, CVE-2026-52924, CVE-2026-52989, CVE-2026-53086, CVE-2026-53131, CVE-2026-53176, CVE-2026-53212, CVE-2026-53225, CVE-2026-53228, CVE-2026-53359)

CSIRTS triage

vendor: Linux product: Linux kernel Remote code execution Privilege escalation Information disclosure Denial of service Memory corruption

What: Multiple vulnerabilities in Linux kernel subsystems including x86 architecture, network drivers, file systems, and protocol handlers.
Who is affected: Systems running affected Linux kernel versions across x86 architecture and various network/storage subsystems.
Urgency: Moderate; multiple flaws affecting core kernel subsystems warrant timely patching to reduce attack surface.
Action: Apply kernel security update USN-8636-1 from Ubuntu security repositories.

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

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-12
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8636-1

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-2026-314050.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-314140.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-315010.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-315890.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-316330.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-316360.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-317050.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-431980.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-433790.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-434650.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-31405	coverage & exploitation status	NVD · CVE.org
CVE-2026-31414	coverage & exploitation status	NVD · CVE.org
CVE-2026-31501	coverage & exploitation status	NVD · CVE.org
CVE-2026-31589	coverage & exploitation status	NVD · CVE.org
CVE-2026-31633	coverage & exploitation status	NVD · CVE.org
CVE-2026-31636	coverage & exploitation status	NVD · CVE.org
CVE-2026-31705	coverage & exploitation status	NVD · CVE.org
CVE-2026-43198	coverage & exploitation status	NVD · CVE.org
CVE-2026-43379	coverage & exploitation status	NVD · CVE.org
CVE-2026-43465	coverage & exploitation status	NVD · CVE.org
CVE-2026-43499	coverage & exploitation status	NVD · CVE.org
CVE-2026-46113	coverage & exploitation status	NVD · CVE.org
CVE-2026-46137	coverage & exploitation status	NVD · CVE.org
CVE-2026-46242	coverage & exploitation status	NVD · CVE.org
CVE-2026-46331	coverage & exploitation status	NVD · CVE.org
CVE-2026-52924	coverage & exploitation status	NVD · CVE.org
CVE-2026-52989	coverage & exploitation status	NVD · CVE.org
CVE-2026-53086	coverage & exploitation status	NVD · CVE.org
CVE-2026-53131	coverage & exploitation status	NVD · CVE.org
CVE-2026-53176	coverage & exploitation status	NVD · CVE.org
CVE-2026-53212	coverage & exploitation status	NVD · CVE.org
CVE-2026-53225	coverage & exploitation status	NVD · CVE.org
CVE-2026-53228	coverage & exploitation status	NVD · CVE.org
CVE-2026-53359	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Vulnerability allows privilege escalationcert-bund
medium[UPDATE] [medium] Linux Kernel: Vulnerability allows privilege escalation and denial of servicecert-bund
high[UPDATE] [medium] Linux Kernel: Vulnerability Allows Unspecified Attackcert-bund
medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-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
unknownUSN-8631-3: Linux kernel (NVIDIA Tegra IGX) vulnerabilitiesubuntu