USN-8658-2: Linux kernel (IBM) vulnerabilities

unknownpublic exploitCVE-2026-53224 CVE-2026-53246 CVE-2026-64531

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: - Open vSwitch; - SCTP protocol; (CVE-2026-53224, CVE-2026-53246, CVE-2026-64531)

CSIRTS triage

vendor: Linux product: Linux kernel (IBM)Remote code execution Denial of service

What: Multiple security flaws in Open vSwitch and SCTP protocol subsystems allow attackers to compromise the system.
Who is affected: IBM-specific Linux kernel builds are affected; exposure depends on kernel version and subsystem configuration.
Urgency: Moderate; no active exploitation reported but kernel vulnerabilities often have high impact if exploited.
Action: Apply the USN-8658-2 security update to affected IBM kernel builds.

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: 2026-08-21
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8658-2

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-2026-532240.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-532460.44% 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-2026-645310.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53224	coverage & exploitation status	NVD · CVE.org
CVE-2026-53246	coverage & exploitation status	NVD · CVE.org
CVE-2026-64531	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownUSN-8659-4: Linux kernel (Oracle) vulnerabilityubuntu
unknownUSN-8658-3: Linux kernel vulnerabilitiesubuntu
unknownUSN-8643-4: Linux kernel vulnerabilitiesubuntu
unknownUSN-8659-3: Linux kernel (Azure) vulnerabilityubuntu
lowUSN-8661-2: Linux kernel (Low Latency) vulnerabilitiesubuntu
unknownUSN-8643-3: Linux kernel (NVIDIA) vulnerabilitiesubuntu
unknownUSN-8659-2: Linux kernel (HWE) vulnerabilityubuntu
unknownUSN-8664-1: Linux kernel (NVIDIA BaseOS) vulnerabilitiesubuntu
unknownUSN-8663-1: Linux kernel (NVIDIA) vulnerabilitiesubuntu
unknownUSN-8644-2: Linux kernel (GCP) vulnerabilitiesubuntu
unknownUSN-8661-1: Linux kernel vulnerabilitiesubuntu
unknownUSN-8660-1: Linux kernel vulnerabilitiesubuntu