CVE-2023-46813: Linux Kernel

High severity, CVSS 7.0. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel before 6.5.9, exploitable by local users with userspace access to MMIO registers. Incorrect access checking in the #VC handler and instruction emulation of the SEV-ES emulation of MMIO accesses could lead to arbitrary write access to kernel memory (and thus privilege escalation). This depends on a race condition through which userspace can replace an instruction before the #VC handler reads it.

Affected products

• Linux Linux Kernel: before 6.5.9 (fixed in 6.5.9)

Published 2023-10-27. Last modified 2026-06-17.