Ubuntu: Security Advisory for intel-microcode (USN-4985-1)

The remote host is missing an update for the 'intel-microcode' package(s) announced via the USN-4985-1 advisory.

It was discovered that some Intel processors may not properly invalidate cache entries used by Intel Virtualization Technology for Directed I/O (VT-d). This may allow a local user to perform a privilege escalation attack. (CVE-2021-24489) Joseph Nuzman discovered that some Intel processors may not properly apply EIBRS mitigations (originally developed for CVE-2017-5715) and hence may allow unauthorized memory reads via sidechannel attacks. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2020-24511) Travis Downs discovered that some Intel processors did not properly flush cache-lines for trivial-data values. This may allow an unauthorized user to infer the presence of these trivial-data-cache-lines via timing sidechannel attacks. A local attacker could use this to expose sensitive information. (CVE-2020-24512) It was discovered that certain Intel Atom processors could expose memory contents stored in microarchitectural buffers. A local attacker could use this to expose sensitive information. (CVE-2020-24513)

'intel-microcode' package(s) on Ubuntu 20.10, Ubuntu 20.04 LTS, Ubuntu 18.04 LTS.

Checks if a vulnerable package version is present on the target host.

Please install the updated package(s).