CVE-2021-47631: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 2.6.33, before 4.9.311 (fixed in 4.9.311); from 4.10, before 4.14.276 (fixed in 4.14.276); from 4.15, before 4.19.239 (fixed in 4.19.239); from 4.20, before 5.4.190 (fixed in 5.4.190); from 5.5, before 5.10.112 (fixed in 5.10.112); from 5.11, before 5.15.35 (fixed in 5.15.35); …

Published 2025-02-26. Last modified 2026-06-17.