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🟠 High | Source: Microsoft Security Response Center CVE-2026-64577 is a vulnerability in the Linux kernel’s GTP (GPRS Tunnelling Protocol) implementation, specifically in the gtp1u_send_echo_resp() function, where a missing return value check on skb_pull_data() could lead to unsafe memory access. This type of flaw can potentially be exploited to cause system instability or, in worst-case scenarios, allow an attacker to influence kernel memory behaviour. It has been surfaced via Microsoft’s Security Response Centre in the context of Azure, likely affecting Linux-based virtual machines or container hosts running on the platform. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-64567 is a Linux kernel vulnerability in the btrfs filesystem driver, which fails to properly validate free space cache entries against available pages. This flaw could lead to memory corruption or system instability if exploited. It is relevant to Azure users running Linux virtual machines or services that utilise btrfs on underlying infrastructure. Security Architect’s Take: Review any Azure Linux VM workloads or container environments using btrfs filesystems and ensure kernel patches are applied promptly once available. Monitor Microsoft’s update guide for patch availability and prioritise patching on internet-facing or multi-tenant Linux workloads. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-64572 is a Linux kernel vulnerability in the IPv4 Forwarding Information Base (FIB) routing subsystem, where a memory management flaw on an insert error path fails to correctly use kfree_rcu() to free a fib_alias structure. This type of use-after-free or improper memory release bug can potentially be exploited to cause system instability or, in certain conditions, arbitrary code execution. It is relevant to Azure as Microsoft has published an advisory, indicating that Azure infrastructure or Linux-based Azure services may be affected. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-64562 is a vulnerability in the Linux Kernel Virtual Machine (KVM) hypervisor’s nested virtualisation (nVMX) component, where a shadow VMCS (Virtual Machine Control Structure) is not hidden immediately after a VMCLEAR operation. This timing flaw could allow a guest virtual machine to observe or interact with internal hypervisor state it should not have access to, potentially leaking sensitive control data. The issue is relevant to Azure as Microsoft’s infrastructure relies on KVM-based virtualisation, meaning tenant workloads could be affected. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-64564 is a kernel-level vulnerability in the SCTP (Stream Control Transmission Protocol) networking stack, specifically in how it handles transport object memory during DEL-IP address processing in ASCONF operations. Improper freeing of a transport pointer can lead to a use-after-free condition, which may be exploitable to cause a denial of service or potentially execute arbitrary code. This affects Linux kernel components surfaced through Azure’s underlying infrastructure. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-64561 is a vulnerability in the Linux Kernel Virtual Machine (KVM) hypervisor’s x86 memory management unit (MMU), where a failure to correctly sequence root page table checks could expose invalid or obsolete memory state. This affects virtualised environments — including Azure-hosted Linux VMs — where KVM is used as the underlying hypervisor component. The flaw could potentially be exploited to cause memory corruption or information disclosure within virtualised workloads. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-18839 is a size_t integer underflow vulnerability in the popt library (popt-devel/popt-static), specifically within the singleoptionhelp function. Integer underflows can lead to memory corruption, potentially allowing an attacker to crash an application or execute arbitrary code. This is relevant to Azure environments where Linux workloads or container images include the popt library. Security Architect’s Take: Audit Linux-based Azure VMs, containers, and CI/CD pipelines for use of popt or popt-static packages and apply vendor patches promptly. Pay particular attention to container base images and infrastructure-as-code pipelines that may bundle this library, as supply chain exposure can be broad. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-68081 is a vulnerability in the Linux KVM hypervisor’s nested virtualisation (nVMX) component, where virtual machine control structure (VMCS) pages are not properly released when a nested VM entry fails due to invalid guest state. This memory management flaw could lead to resource exhaustion or potentially be exploited to destabilise the host hypervisor. It is particularly relevant to Azure, where the underlying infrastructure relies on KVM-based virtualisation. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-34502 is a heap buffer overflow vulnerability in the Apache Portable Runtime Utility (APR) memcached client, a widely used C library that underpins many server-side applications. Heap buffer overflows can allow attackers to corrupt memory, potentially leading to remote code execution or application crashes. The vulnerability is particularly significant because APR is a foundational dependency in many Apache-based projects, meaning the blast radius could be broad across affected environments. ...

🟠 High | Source: Microsoft Security Response Center CVE-2026-34501 is a heap buffer overflow vulnerability in the Apache Portable Runtime Utility (APR) library’s Redis client component. Heap buffer overflows can allow attackers to corrupt memory, potentially leading to arbitrary code execution or service crashes. This is particularly relevant to Azure environments and any workloads relying on APR-based software stacks that interact with Redis. Security Architect’s Take: Identify any Azure-hosted workloads or application stacks using Apache Portable Runtime Utility (APR) with Redis connectivity, and prioritise patching to the latest APR version. Additionally, review network segmentation controls to limit exposure of Redis endpoints to only trusted internal services. ...