{"cve":"CVE-2021-47631","nvd":{"published":"2025-02-26T06:37:04.400","modified":"2026-06-17T04:18:11.560","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a","https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da","https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea","https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f","https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2021-47631","score":0.00244,"percentile":0.15615,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}