# CVE-2023-49100: arm-trusted-firmware: Trusted Firmware-A (TF-A) before 2.10 has a potential read out-of-bounds in the SDEI service

CVE-2023-49100 is fixed in arm-trusted-firmware on 1 platform, first by DEBIAN-CVE-2023-49100, released February 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-49100
- Priority: Routine
- CVSS: 4.4 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 21, 2024

## Description

Trusted Firmware-A (TF-A) before 2.10 has a potential read out-of-bounds in the SDEI service. The input parameter passed in register x1 is not validated well enough in the function sdei_interrupt_bind. The parameter is passed to a call to plat_ic_get_interrupt_type. It can be any arbitrary value passing checks in the function plat_ic_is_sgi. A compromised Normal World (Linux kernel) can enable a root-privileged attacker to issue arbitrary SMC calls. Using this primitive, he can control the content of registers x0 through x6, which are used to send parameters to TF-A. Out-of-bounds addresses can be read in the context of TF-A (EL3). Because the read value is never returned to non-secure memory or in registers, no leak is possible. An attacker can still crash TF-A, however.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | arm-trusted-firmware Debian 13.5 (trixie) | 2.10.0+dfsg-1 | [DEBIAN-CVE-2023-49100](https://patchblox.com/security/data/fix/linux/debian-cve-2023-49100.md) | Feb 21, 2024 |
| Linux | arm-trusted-firmware Debian 14 | 2.10.0+dfsg-1 | [DEBIAN-CVE-2023-49100](https://patchblox.com/security/data/fix/linux/debian-cve-2023-49100.md) | Feb 21, 2024 |

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Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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