USN-8644-2: Linux kernel (GCP) 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: - 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
- 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.
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Details
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-2026-430710.40% 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-2026-529140.51% 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-2026-529930.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-530430.51% 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-2026-532240.52% 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-2026-533090.40% 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-2026-43071 | 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.
- high[UPDATE] [hoch] Linux Kernel: Mehrere Schwachstellencert-bund
- medium[UPDATE] [mittel] Linux Kernel: Mehrere Schwachstellencert-bund
- high[UPDATE] [hoch] Linux Kernel: Mehrere Schwachstellencert-bund
- medium[UPDATE] [mittel] Linux Kernel: Mehrere Schwachstellencert-bund
- unknownMultiples vulnérabilités dans le noyau Linux de Red Hat (11 septembre 2026)cert-fr-avis
- unknownUSN-8748-1: Linux kernel (NVIDIA) vulnerabilitiesubuntu
- unknownMultiples vulnérabilités dans Google Android (10 septembre 2026)cert-fr-avis
- unknownexploitedUSN-8728-1: Linux kernel (GCP) vulnerabilitiesubuntu
- unknownUbuntu Linux Kernel Multiple Vulnerabilitieshkcert
- unknownUSN-8714-2: Linux kernel vulnerabilitiesubuntu
- unknownUSN-8725-1: Linux kernel vulnerabilitiesubuntu
- unknownMultiples vulnérabilités dans le noyau Linux d'Ubuntu (04 septembre 2026)cert-fr-avis
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