CVE-2021-47631: ARM: davinci: da850-evm: Avoid NULL pointer dereference
Vulnerability summary
CVE-2021-47631 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.6% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.24% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu106 products
- linuxAll versions (No fix recorded) | < 4.15.0-189.200 | < 5.4.0-122.138 | < 5.15.0-37.39
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1137.148 | < 5.4.0-1081.88 | < 5.15.0-1011.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ bae105879f2f2404155da6f50b3636193d228a62, < c06f476e5b74bcabb8c4a2fba55864a37e62843b | ≥ bae105879f2f2404155da6f50b3636193d228a62, < a12b356d45cbb6e8a1b718d1436b3d6239a862f3 | ≥ bae105879f2f2404155da6f50b3636193d228a62, < c64e2ed5cc376e137e572babfd2edc38b2cfb61b | ≥ bae105879f2f2404155da6f50b3636193d228a62, < 89931d4762572aaee6edbe5673d41f8082de110f | ≥ bae105879f2f2404155da6f50b3636193d228a62, < 0a312ec66a03133d28570f07bc52749ccfef54da | ≥ bae105879f2f2404155da6f50b3636193d228a62, < 0940795c6834fbe7705acc5c3d4b2f7a5f67527a | ≥ bae105879f2f2404155da6f50b3636193d228a62, < c5628533a3ece64235d04fe11ec44d2be99e423d | ≥ bae105879f2f2404155da6f50b3636193d228a62, < 83a1cde5c74bfb44b49cb2a940d044bb2380f4ea | 2.6.33
- linux_kernel≥ 2.6.33, < 4.9.311 | ≥ 4.10, < 4.14.276 | ≥ 4.15, < 4.19.239 | ≥ 4.20, < 5.4.190 | ≥ 5.5, < 5.10.112 | ≥ 5.11, < 5.15.35 | ≥ 5.16, < 5.17.4 | 5.18:rc1 | 5.18:rc2
Debian1 product
- linux< 5.17.6-1
3 vendors · 109 products
