Ubuntu Security Notice 6533-1 - Tom Dohrmann discovered that the Secure Encrypted Virtualization implementation for AMD processors in the Linux kernel contained a race condition when accessing MMIO registers. A local attacker in a SEV guest VM could possibly use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the io_uring subsystem in the Linux kernel contained a race condition, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service.
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