# CVE-2021-47631: linux: In the Linux kernel, the following vulnerability has been resolved:  ARM: davinci: da850-evm: Avoid NULL pointer dere...

CVE-2021-47631 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47631, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47631
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  ARM: davinci: da850-evm: Avoid NULL pointer dereference  With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:  Unable to handle kernel NULL pointer dereference at virtual address 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0  The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall().  Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.6-1 | [DEBIAN-CVE-2021-47631](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47631.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.6-1 | [DEBIAN-CVE-2021-47631](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47631.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.6-1 | [DEBIAN-CVE-2021-47631](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47631.md) | Feb 26, 2025 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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