USN-8643-3: Linux kernel (NVIDIA) vulnerabilities
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: - Network drivers; - Open vSwitch; - SCTP protocol; (CVE-2026-53224, CVE-2026-53246, CVE-2026-53247, CVE-2026-64531)
CSIRTS triage
- What
- Multiple security issues in network drivers, Open vSwitch, and SCTP protocol implementation.
- Who is affected
- Systems running affected Linux kernel versions with exposed network functionality.
- Urgency
- Severity unknown; apply as part of regular patch management.
- Action
- Apply kernel security updates provided by distribution maintainer.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Linux kernel
Get an email when a new Linux kernel advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://ubuntu.com/security/notices/USN-8643-3
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-2026-532470.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% 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-2026-53247 | 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
- unknownUSN-8658-2: Linux kernel (IBM) vulnerabilitiesubuntu
- lowUSN-8661-2: Linux kernel (Low Latency) 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
More from Ubuntu Security Notices
- unknownUSN-8659-4: Linux kernel (Oracle) vulnerability2026-08-26
- unknownUSN-8666-2: Linux kernel (Azure) vulnerabilities2026-08-25
- unknownUSN-8630-5: Linux kernel (Raspberry Pi) vulnerabilities2026-08-25
- unknownUSN-8658-3: Linux kernel vulnerabilities2026-08-25
- unknownUSN-8643-4: Linux kernel vulnerabilities2026-08-25