CVE-2024-21820

Publication date 13 November 2024

Last updated 30 May 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.2 · High

Score breakdown

Incorrect default permissions in some Intel(R) Xeon(R) processor memory controller configurations when using Intel(R) SGX may allow a privileged user to potentially enable escalation of privilege via local access.

From the Ubuntu Security Team

Avraham Shalev and Nagaraju N Kodalapura discovered that some Intel(R) Xeon(R) processors did not properly restrict access to the memory controller when using Intel(R) SGX. This may allow a local privileged attacker to further escalate their privileges.

Status

Package Ubuntu Release Status
intel-microcode 24.10 oracular
Fixed 3.20241112.0ubuntu0.24.10.1
24.04 LTS noble
Fixed 3.20241112.0ubuntu0.24.04.1
22.04 LTS jammy
Fixed 3.20241112.0ubuntu0.22.04.1
20.04 LTS focal
Fixed 3.20241112.0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 3.20241112.0ubuntu0.18.04.1+esm1
16.04 LTS xenial
Fixed 3.20241112.0ubuntu0.16.04.1+esm1
14.04 LTS trusty Ignored trusty doesn’t support late loading of microcode

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Severity score breakdown

Parameter Value
Base score 7.2 · High
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N