USN-8630-4: Linux kernel (AWS) vulnerabilities

unknownpublic exploitCVE-2026-43083 CVE-2026-43197 CVE-2026-43198 CVE-2026-43465 CVE-2026-46242 CVE-2026-46325

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; - Network drivers; - Mellanox network drivers; - File systems infrastructure; - IPv4 networking; - Network traffic control; - TCP network protocol; - B.A.T.M.A.N. meshing protocol; - IPv6 networking; - Multipath TCP; - Netfilter; - RxRPC session sockets; - SCTP protocol; - SMC sockets; (CVE-2026-43083, CVE-2026-43197, CVE-2026-43198, CVE-2026-43465, CVE-2026-46242, CVE-2026-46325, CVE-2026-46331, CVE-2026-52914, CVE-2026-52924, CVE-2026-52931, CVE-2026-53151, CVE-2026-53176, CVE-2026-53212, CVE-2026-53215, CVE-2026-53225, CVE-2026-53228, CVE-2026-53359)

CSIRTS triage

vendor: Linux product: Linux kernel (AWS)Memory corruption Denial of serviceOther

What: Multiple kernel vulnerabilities across networking, file systems, and protocol handlers affecting x86, InfiniBand, Netfilter, and socket implementations.
Who is affected: AWS systems running affected Linux kernel versions.
Urgency: Moderate; various DoS and memory corruption vectors, mostly requiring local or adjacent network access.
Action: Apply USN-8630-4 kernel security update for AWS.

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: 2026-08-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8630-4

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-2026-430830.44% 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-2026-431970.48% 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-2026-431980.30% 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-2026-434650.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-462423.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 87% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-463250.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-463310.53% 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-2026-529140.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-529240.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-529310.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-43083	coverage & exploitation status	NVD · CVE.org
CVE-2026-43197	coverage & exploitation status	NVD · CVE.org
CVE-2026-43198	coverage & exploitation status	NVD · CVE.org
CVE-2026-43465	coverage & exploitation status	NVD · CVE.org
CVE-2026-46242	coverage & exploitation status	NVD · CVE.org
CVE-2026-46325	coverage & exploitation status	NVD · CVE.org
CVE-2026-46331	coverage & exploitation status	NVD · CVE.org
CVE-2026-52914	coverage & exploitation status	NVD · CVE.org
CVE-2026-52924	coverage & exploitation status	NVD · CVE.org
CVE-2026-52931	coverage & exploitation status	NVD · CVE.org
CVE-2026-53151	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-2026-53215	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.

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