CVE-2021-47631

MediumCVSS 5.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

VendorProductVersions
LinuxLinux>= bae105879f2f2404155da6f50b3636193d228a62, < c06f476e5b74bcabb8c4a2fba55864a37e62843b; >= bae105879f2f2404155da6f50b3636193d228a62, < a12b356d45cbb6e8a1b718d1436b3d6239a862f3; >= bae105879f2f2404155da6f50b3636193d228a62, < c64e2ed5cc376e137e572babfd2edc38b2cfb61b; >= bae105879f2f2404155da6f50b3636193d228a62, < 89931d4762572aaee6edbe5673d41f8082de110f; >= bae105879f2f2404155da6f50b3636193d228a62, < 0a312ec66a03133d28570f07bc52749ccfef54da; >= bae105879f2f2404155da6f50b3636193d228a62, < 0940795c6834fbe7705acc5c3d4b2f7a5f67527a; >= bae105879f2f2404155da6f50b3636193d228a62, < c5628533a3ece64235d04fe11ec44d2be99e423d; >= bae105879f2f2404155da6f50b3636193d228a62, < 83a1cde5c74bfb44b49cb2a940d044bb2380f4ea
LinuxLinux2.6.33

References

Timeline

Published
Feb 26, 2025
Last modified
Jun 17, 2026
NVD status
Modified

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