USN-8644-3: Linux kernel (Azure) 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
- Linux kernel Azure variant contains multiple vulnerabilities in file systems, mesh protocols, and network protocols.
- Who is affected
- Azure Linux systems running affected kernel versions.
- Urgency
- Medium; multiple CVEs affecting various subsystems should be patched in normal maintenance cycle.
- Action
- Update to USN-8644-3 or later kernel version for Azure deployments.
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-8644-3
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-2026-430710.39% 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 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.
- medium[UPDATE] [medium] Linux Kernel: Multiple Vulnerabilitiescert-bund
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
- high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
- unknownUSN-8661-4: Linux kernel vulnerabilitiesubuntu
- unknownUSN-8715-1: Linux kernel (Oracle) vulnerabilitiesubuntu
- unknownUSN-8714-1: Linux kernel vulnerabilitiesubuntu
- unknownSUSE Linux Kernel Multiple Vulnerabilitieshkcert
- unknownexploitedMultiple vulnerabilities in IBM products (August 28, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in SUSE Linux kernel (August 28, 2026)cert-fr-avis
- unknownUSN-8666-3: Linux kernel (GCP FIPS) vulnerabilitiesubuntu
- unknownUSN-8661-3: Linux kernel vulnerabilitiesubuntu
More from Ubuntu Security Notices
- unknownUSN-8717-1: Apache Tika vulnerability2026-09-03
- unknownUSN-8661-4: Linux kernel vulnerabilities2026-09-02
- unknownUSN-8715-1: Linux kernel (Oracle) vulnerabilities2026-09-02
- unknownUSN-8714-1: Linux kernel vulnerabilities2026-09-02
- unknownUSN-8713-1: BioSig vulnerabilities2026-09-02