# CVE-2024-21820: intel-microcode: Incorrect default permissions in some Intel(R) Xeon(R) processor memorycontroller configurations when using Intel(R)...

CVE-2024-21820 is fixed in 3 products on 1 platform, first by ALAS2023-2024-748, released October 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-21820
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 24, 2024

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | intel-microcode Debian 11.6 (bullseye) | 3.20241112.1~deb11u1 | [DLA-4002-1](https://patchblox.com/security/data/fix/linux/dla-4002-1.md) | Dec 23, 2024 |
| Linux | intel-microcode Debian 12.15 (bookworm) | 3.20241112.1~deb12u1 | [DEBIAN-CVE-2024-21820](https://patchblox.com/security/data/fix/linux/debian-cve-2024-21820.md) | Nov 13, 2024 |
| Linux | intel-microcode Debian 13.5 (trixie) | 3.20241112.1 | [DEBIAN-CVE-2024-21820](https://patchblox.com/security/data/fix/linux/debian-cve-2024-21820.md) | Nov 13, 2024 |
| Linux | intel-microcode Debian 14 | 3.20241112.1 | [DEBIAN-CVE-2024-21820](https://patchblox.com/security/data/fix/linux/debian-cve-2024-21820.md) | Nov 13, 2024 |
| Linux | intel-microcode Ubuntu 18.04.6 LTS (bionic) | 3.20241112.0ubuntu0.18.04.1+esm1 | [intel-microcode 3.20241112.0ubuntu0.18.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-intel-microcode-3.20241112.0ubuntu0.18.04.1-esm1.md) | Nov 13, 2024 |
| Linux | intel-microcode Ubuntu 20.04 LTS (focal) | 3.20241112.0ubuntu0.20.04.1 | [intel-microcode 3.20241112.0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-intel-microcode-3.20241112.0ubuntu0.20.04.1.md) | Nov 13, 2024 |
| Linux | intel-microcode Ubuntu 22.04.1 LTS (jammy) | 3.20241112.0ubuntu0.22.04.1 | [intel-microcode 3.20241112.0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-intel-microcode-3.20241112.0ubuntu0.22.04.1.md) | Nov 13, 2024 |
| Linux | intel-microcode Ubuntu 24.04.5 LTS (noble) | 3.20241112.0ubuntu0.24.04.1 | [intel-microcode 3.20241112.0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-intel-microcode-3.20241112.0ubuntu0.24.04.1.md) | Nov 13, 2024 |
| Linux | intel-microcode Ubuntu 24.10 (oracular) | 3.20241112.0ubuntu0.24.10.1 | [intel-microcode 3.20241112.0ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-intel-microcode-3.20241112.0ubuntu0.24.10.1.md) | Jan 16, 2026 |
| Linux | microcode_ctl amzn 2023 | 2:2.1-53.amzn2023.0.9 | [ALAS2023-2024-748](https://patchblox.com/security/data/fix/linux/alas2023-2024-748.md) | Oct 24, 2024 |
| Linux | ucode-intel opensuse-leap 15.6 | 20241112-150200.50.1 | [SUSE-SU-2024:4053-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4053-1.md) | Nov 26, 2024 |
| Linux | ucode-intel sles 15.6 | 20241112-150200.50.1 | [SUSE-SU-2024:4053-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4053-1.md) | Nov 26, 2024 |

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Data as of 2026-11-11T13:47:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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