CVE-2026-46059

highCVSS 5.5covered by 3 sourcesfirst seen 2026-07-20

It was discovered that some AMD processors did not properly clear data in the floating point divider unit during speculative execution. A local attacker could use this to expose sensitive information. (CVE-2025-54505) It was discovered that some AMD Zen 2 processors did not properly isolate shared resources in the operation cache. A local attacker could possibly use this issue to corrupt instructions executed at a higher privilege level, resulting in privilege escalation. (CVE-2025-54518) 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 platform drivers; - PSP security protocol; - ARM32 architecture; - ARM64 architecture; - MIPS architecture; - PowerPC architecture; - RISC-V architecture; - S390 architecture; - User-Mode Linux (UML); - x86 architecture; - Block layer subsystem; - Cryptographic API; - Intel NPU Driver; - Compute Acceleration Framework; - ACPI drivers; - Auxiliary display drivers; - Drivers core; - DRBD Distributed Replicated Block Device drivers; - Rados block device (RBD) driver; - Ublk userspace block driver; - Compressed RAM block device driver; - Bluetooth drivers; - Bus devices; - Character device driver; - TPM device driver; - Clock framework and drivers; - CPU frequency scaling framework; - Hardware crypto device drivers; - Buffer Sharing and Synchronization framework; - DPLL subsystem; - EDAC drivers; - Arm Firmware Framework for ARMv8-A(FFA); - EFI core; - FWCTL subsystem; - GPIO subsystem; - GPU drivers; - Greybus drivers; - HID subsystem; - Microsoft Hyper-V drivers; - Hardware monitoring drivers; - I2C subsystem; - I3C subsystem; - IIO ADC drivers; - IIO subsystem; - InfiniBand drivers; - Input Device core drivers; - IOMMU subsystem; - LED subsystem; - Mailbox framework; - Multiple devices driver; - Media drivers; - NVIDIA Tegra memory controller driver; - IBM Advanced System Management driver; - MTD blo

CSIRTS triage

product: Linux kernel (KVM hypervisor)Misconfiguration

What: KVM's nested virtualization (nSVM) incorrectly uses NextRIP without proper validation when returning from L2 guest VMRUN, potentially causing guest state corruption.
Who is affected: Hypervisors running nested virtual machines using AMD-based KVM with nSVM support.
Urgency: Medium; CVSS 5.5 with guest-to-host escape potential depending on implementation details.
Action: Update to a patched Linux kernel version that always validates and properly sets NextRIP in vmcb02 after first L2 VMRUN.

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

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Exploitation outlook

Low exploitation risk0.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Advisory coverage (3)

mediumCVE-2026-46059: KVM: nSVM: Always use NextRIP as vmcb02's NextRIP after first L2 VMRUNmsrc · 2026-08-06
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu · 2026-07-24
highUSN-8569-1: Linux kernel (HWE) vulnerabilitiesubuntu · 2026-07-20

External references

NVD record for CVE-2026-46059

CVE.org record

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