# RHSA-2024:1902: Security update for 3 packages

RHSA-2024:1902, released April 18, 2024, fixes 6 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2024-1902
- Platform: Linux
- Released: Apr 18, 2024
- Priority: Urgent (Closes CVE-2023-40547, rated Critical)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2024:1902

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [shim-aa64](https://patchblox.com/security/data/product/linux/shim-aa64.md) | RHEL 8 | 0:15.8-4.el8_9 |
| [shim-ia32](https://patchblox.com/security/data/product/linux/shim-ia32.md) | RHEL 8 | 0:15.8-4.el8_9 |
| [shim-x64](https://patchblox.com/security/data/product/linux/shim-x64.md) | RHEL 8 | 0:15.8-4.el8_9 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-40547](https://patchblox.com/security/data/cve/CVE-2023-40547.md) | Urgent | Redhat: CVE-2023-40547 Shim - RCE in HTTP boot support may lead to secure boot bypass | 8.3 | 0.0542 |  |
| [CVE-2023-40548](https://patchblox.com/security/data/cve/CVE-2023-40548.md) | High | shim: A buffer overflow was found in Shim in the 32-bit system | 7.4 | 0.0044 |  |
| [CVE-2023-40546](https://patchblox.com/security/data/cve/CVE-2023-40546.md) | Routine | shim: A flaw was found in Shim when an error happened while creating a new ESL variable | 6.2 | 0.0044 |  |
| [CVE-2023-40549](https://patchblox.com/security/data/cve/CVE-2023-40549.md) | Routine | shim: An out-of-bounds read flaw was found in Shim due to the lack of properboundary verification during the load of a PE b... | 6.2 | 0.0041 |  |
| [CVE-2023-40550](https://patchblox.com/security/data/cve/CVE-2023-40550.md) | Routine | shim: An out-of-bounds read flaw was found in Shim when it tried to validate theSBAT information | 5.5 | 0.0040 |  |
| [CVE-2023-40551](https://patchblox.com/security/data/cve/CVE-2023-40551.md) | Routine | shim: A flaw was found in the MZ binary format in Shim | 5.1 | 0.0040 |  |

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Data as of 2026-11-09T19:38:12Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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