USN-8662-2: Linux kernel (FIPS) vulnerabilities

unknownpublic exploitCVE-2026-31405 CVE-2026-31414 CVE-2026-31448 CVE-2026-31649 CVE-2026-43198 CVE-2026-43493

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; - Cryptographic API; - InfiniBand drivers; - Media drivers; - STMicroelectronics network drivers; - Network drivers; - Ext4 file system; - IPv4 networking; - TCP network protocol; - Locking primitives; - Ceph Core library; - IPv6 networking; - Multipath TCP; - Netfilter; - SCTP protocol; - SMC sockets; (CVE-2026-31405, CVE-2026-31414, CVE-2026-31448, CVE-2026-31649, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499, CVE-2026-46266, CVE-2026-52955, CVE-2026-52982, CVE-2026-52986, CVE-2026-53006, CVE-2026-53176, 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 corruptionaffected: FIPS versions (multiple subsystems affected)

What: Multiple vulnerabilities in kernel subsystems including x86, cryptographic API, network drivers, and protocol handlers.
Who is affected: Systems running FIPS-enabled Linux kernel versions affected by the listed CVEs.
Urgency: Moderate; multiple subsystems patched but no public exploit reported; kernel vulnerabilities can be critical depending on specific flaw.
Action: Apply kernel security update USN-8662-2 from Ubuntu or equivalent from your distribution.

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-8662-2

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-2026-314050.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% 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-2026-314480.44% 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-2026-316490.46% 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-2026-431980.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-434930.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-434990.73% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-462660.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-529550.38% 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-2026-529820.54% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 43% 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-2026-31448	coverage & exploitation status	NVD · CVE.org
CVE-2026-31649	coverage & exploitation status	NVD · CVE.org
CVE-2026-43198	coverage & exploitation status	NVD · CVE.org
CVE-2026-43493	coverage & exploitation status	NVD · CVE.org
CVE-2026-43499	coverage & exploitation status	NVD · CVE.org
CVE-2026-46266	coverage & exploitation status	NVD · CVE.org
CVE-2026-52955	coverage & exploitation status	NVD · CVE.org
CVE-2026-52982	coverage & exploitation status	NVD · CVE.org
CVE-2026-52986	coverage & exploitation status	NVD · CVE.org
CVE-2026-53006	coverage & exploitation status	NVD · CVE.org
CVE-2026-53176	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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high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
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lowUSN-8661-2: Linux kernel (Low Latency) vulnerabilitiesubuntu
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