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ID

VAR-202405-3760


CVE

CVE-2021-47316


TITLE

Linux  of  Linux Kernel  In  NULL  Pointer dereference vulnerability

Trust: 0.8

sources: JVNDB: JVNDB-2021-021426

DESCRIPTION

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix NULL dereference in nfs3svc_encode_getaclres In error cases the dentry may be NULL. Before 20798dfe249a, the encoder also checked dentry and d_really_is_positive(dentry), but that looks like overkill to me--zero status should be enough to guarantee a positive dentry. This isn't the first time we've seen an error-case NULL dereference hidden in the initialization of a local variable in an xdr encoder. But I went back through the other recent rewrites and didn't spot any similar bugs. The RUGGEDCOM RST2428P is a Layer 2 Ethernet switch based on SINEC OS with up to 28 non-blocking interfaces. SCALANCE X switches are used to connect industrial components such as programmable logic controllers (PLCs) and human-machine interfaces (HMIs). Multiple vulnerabilities exist in third-party components prior to SIEMENS SINEC OS V3.2. These vulnerabilities could be exploited to corrupt values, leading to undefined behavior or security issues

Trust: 2.16

sources: NVD: CVE-2021-47316 // JVNDB: JVNDB-2021-021426 // CNVD: CNVD-2025-19350

IOT TAXONOMY

category:['ICS']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2025-19350

AFFECTED PRODUCTS

vendor:linuxmodel:kernelscope:ltversion:5.13.4

Trust: 1.0

vendor:linuxmodel:kernelscope:gteversion:5.13

Trust: 1.0

vendor:linuxmodel:kernelscope:eqversion:5.13 that's all 5.13.4

Trust: 0.8

vendor:linuxmodel:kernelscope:eqversion: -

Trust: 0.8

vendor:siemensmodel:ruggedcom rst2428pscope:ltversion:v3.2

Trust: 0.6

vendor:siemensmodel:scalance xc-300/xr-300/xc-400/xr-500wg/xr-500 familyscope:ltversion:v3.2

Trust: 0.6

vendor:siemensmodel:scalance xcm-/xrm-/xch-/xrh-300 familyscope:ltversion:v3.2

Trust: 0.6

sources: CNVD: CNVD-2025-19350 // JVNDB: JVNDB-2021-021426 // NVD: CVE-2021-47316

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2021-47316
value: MEDIUM

Trust: 1.0

NVD: CVE-2021-47316
value: MEDIUM

Trust: 0.8

CNVD: CNVD-2025-19350
value: HIGH

Trust: 0.6

CNVD: CNVD-2025-19350
severity: HIGH
baseScore: 7.2
vectorString: AV:L/AC:L/AU:N/C:C/I:C/A:C
accessVector: LOCAL
accessComplexity: LOW
authentication: NONE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 3.9
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

nvd@nist.gov: CVE-2021-47316
baseSeverity: MEDIUM
baseScore: 5.5
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
exploitabilityScore: 1.8
impactScore: 3.6
version: 3.1

Trust: 1.0

NVD: CVE-2021-47316
baseSeverity: MEDIUM
baseScore: 5.5
vectorString: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
exploitabilityScore: NONE
impactScore: NONE
version: 3.0

Trust: 0.8

sources: CNVD: CNVD-2025-19350 // JVNDB: JVNDB-2021-021426 // NVD: CVE-2021-47316

PROBLEMTYPE DATA

problemtype:CWE-476

Trust: 1.0

problemtype:NULL Pointer dereference (CWE-476) [NVD evaluation ]

Trust: 0.8

sources: JVNDB: JVNDB-2021-021426 // NVD: CVE-2021-47316

PATCH

title:Linux Kernel Archivesurl:https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870

Trust: 0.8

title:Patch for Multiple vulnerabilities exist in third-party components of SIEMENS SINEC OS V3.2 and earlierurl:https://www.cnvd.org.cn/patchInfo/show/723061

Trust: 0.6

sources: CNVD: CNVD-2025-19350 // JVNDB: JVNDB-2021-021426

EXTERNAL IDS

db:NVDid:CVE-2021-47316

Trust: 2.6

db:SIEMENSid:SSA-355557

Trust: 1.6

db:SIEMENSid:SSA-265688

Trust: 1.0

db:JVNid:JVNVU92169998

Trust: 0.8

db:ICS CERTid:ICSA-25-226-07

Trust: 0.8

db:JVNDBid:JVNDB-2021-021426

Trust: 0.8

db:CNVDid:CNVD-2025-19350

Trust: 0.6

sources: CNVD: CNVD-2025-19350 // JVNDB: JVNDB-2021-021426 // NVD: CVE-2021-47316

REFERENCES

url:https://cert-portal.siemens.com/productcert/html/ssa-355557.html

Trust: 1.6

url:https://git.kernel.org/stable/c/e79057d15d96ef19de4de6d7e479bae3d58a2a8d

Trust: 1.0

url:https://git.kernel.org/stable/c/ab1016d39cc052064e32f25ad18ef8767a0ee3b8

Trust: 1.0

url:https://git.kernel.org/stable/c/650e6f383a6eb40f7c0a010982a74ab4b6893870

Trust: 1.0

url:https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Trust: 1.0

url:https://jvn.jp/vu/jvnvu92169998/index.html

Trust: 0.8

url:https://nvd.nist.gov/vuln/detail/cve-2021-47316

Trust: 0.8

url:https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

Trust: 0.8

sources: CNVD: CNVD-2025-19350 // JVNDB: JVNDB-2021-021426 // NVD: CVE-2021-47316

SOURCES

db:CNVDid:CNVD-2025-19350
db:JVNDBid:JVNDB-2021-021426
db:NVDid:CVE-2021-47316

LAST UPDATE DATE

2026-06-19T20:39:29.390000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2025-19350date:2025-08-22T00:00:00
db:JVNDBid:JVNDB-2021-021426date:2025-08-26T10:44:00
db:NVDid:CVE-2021-47316date:2026-05-12T10:16:37.227

SOURCES RELEASE DATE

db:CNVDid:CNVD-2025-19350date:2025-08-12T00:00:00
db:JVNDBid:JVNDB-2021-021426date:2024-12-25T00:00:00
db:NVDid:CVE-2021-47316date:2024-05-21T15:15:18.940