USN-8644-2: Linux kernel (GCP) vulnerabilities

unknownCVE-2026-43071 CVE-2026-52914 CVE-2026-52993 CVE-2026-53043 CVE-2026-53224 CVE-2026-53246

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: - File systems infrastructure; - OCFS2 file system; - B.A.T.M.A.N. meshing protocol; - SCTP protocol; - TIPC protocol; (CVE-2026-43071, CVE-2026-52914, CVE-2026-52993, CVE-2026-53043, CVE-2026-53224, CVE-2026-53246, CVE-2026-53309)

CSIRTS triage

vendor: Linux product: Linux kernel (GCP)Other

What: Multiple unspecified security flaws in file systems, OCFS2, B.A.T.M.A.N. meshing, SCTP, and TIPC protocol subsystems.
Who is affected: Google Cloud Platform Linux kernel deployments.
Urgency: Moderate; no active exploitation reported but multiple subsystems affected.
Action: Apply the USN-8644-2 kernel update for GCP environments.

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

⚡ Watch Linux kernel (GCP)

Get an email when a new Linux kernel (GCP) advisory drops — max one per day, one-click unsubscribe.

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-8644-2

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-2026-430710.39% 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-2026-529140.51% 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-2026-529930.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-530430.73% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.
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-2026-533090.76% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-43071	coverage & exploitation status	NVD · CVE.org
CVE-2026-52914	coverage & exploitation status	NVD · CVE.org
CVE-2026-52993	coverage & exploitation status	NVD · CVE.org
CVE-2026-53043	coverage & exploitation status	NVD · CVE.org
CVE-2026-53224	coverage & exploitation status	NVD · CVE.org
CVE-2026-53246	coverage & exploitation status	NVD · CVE.org
CVE-2026-53309	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownUSN-8666-2: Linux kernel (Azure) vulnerabilitiesubuntu
unknownUSN-8630-5: Linux kernel (Raspberry Pi) vulnerabilitiesubuntu
unknownUSN-8658-3: Linux kernel vulnerabilitiesubuntu
unknownUSN-8643-4: Linux kernel vulnerabilitiesubuntu
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownUSN-8658-2: Linux kernel (IBM) vulnerabilitiesubuntu
lowUSN-8661-2: Linux kernel (Low Latency) vulnerabilitiesubuntu
unknownUSN-8643-3: Linux kernel (NVIDIA) vulnerabilitiesubuntu
unknownUSN-8668-1: Linux kernel (GCP) vulnerabilitiesubuntu