CVE-2021-47631

MEDIUM EPSS 12.9%
Published Feb 26, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
12.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥2.6.33  –  <4.9.311
linuxlinux_kernel*≥4.10  –  <4.14.276
linuxlinux_kernel*≥4.15  –  <4.19.239
linuxlinux_kernel*≥4.20  –  <5.4.190
linuxlinux_kernel*≥5.5  –  <5.10.112
linuxlinux_kernel*≥5.11  –  <5.15.35
linuxlinux_kernel*≥5.16  –  <5.17.4
linuxlinux_kernel5.18any
linuxlinux_kernel5.18any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0940795c6834fbe7705acc5c3d4b2f7a5f67527a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0a312ec66a03133d28570f07bc52749ccfef54da
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83a1cde5c74bfb44b49cb2a940d044bb2380f4ea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/89931d4762572aaee6edbe5673d41f8082de110f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a12b356d45cbb6e8a1b718d1436b3d6239a862f3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c06f476e5b74bcabb8c4a2fba55864a37e62843b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5628533a3ece64235d04fe11ec44d2be99e423d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c64e2ed5cc376e137e572babfd2edc38b2cfb61b
    Patch