CVE-2026-46014

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

What: KVM SVM hypervisor is missing save/restore handling of LBR (Last Branch Record) MSRs, potentially leaking CPU branch information.
Who is affected: Systems using KVM with AMD SVM virtualization that may expose LBR state between VMs.
Urgency: Medium severity (CVSS 5.5) information disclosure; exploitation unlikely but information leakage risk exists.
Action: Apply kernel patch to add proper LBR MSR save/restore handling in KVM SVM code.

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

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Exploitation outlook

Low exploitation risk0.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Advisory coverage (3)

mediumCVE-2026-46014: KVM: SVM: Add missing save/restore handling of LBR MSRsmsrc · 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-2026-46014

CVE.org record

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