Is CVE-2023-21400 in the CISA KEV catalog?

No. CVE-2023-21400 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21400?

CVE-2023-21400 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2023-21400?

CVE-2023-21400 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21400?

Upgrade linux on debian 11 to 5.10.191-1 or later. Fixes are available for 140 affected products.

CVE & CISA-KEV Catalog

CVE-2023-21400

MEDIUM

6.7

CVSS v3

NVD

Description

In multiple functions of io_uring.c, there is a possible kernel memory corruption due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.

CWE-667

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.191-1CVE-2023-21400

Fixed in:5.18.2-1CVE-2023-21400

awsUbuntu

Fixed in:4.4.0-1098LSN-0098-1

Fixed in:4.15.0-1054LSN-0098-1

Fixed in:5.4.0-1009LSN-0098-1

Fixed in:5.15.0-1000LSN-0098-1

aws-5.15Ubuntu

Fixed in:5.15.0-1000LSN-0098-1

aws-6.2Ubuntu

Fixed in:6.2.0-1007LSN-0098-1

azureUbuntu

Fixed in:4.15.0-1063LSN-0098-1

Fixed in:5.4.0-1010LSN-0098-1

Fixed in:5.15.0-1000LSN-0098-1

azure-4.15Ubuntu

Fixed in:4.15.0-1115LSN-0098-1

azure-6.2Ubuntu

Fixed in:6.2.0-1000LSN-0098-1

gcpUbuntu

Fixed in:4.15.0-1118LSN-0098-1

Fixed in:5.4.0-1009LSN-0098-1

Fixed in:5.15.0-1000LSN-0098-1

gcp-4.15Ubuntu

Fixed in:4.15.0-1121LSN-0098-1

gcp-5.15Ubuntu

Fixed in:5.15.0-1000LSN-0098-1

gcp-6.2Ubuntu

Fixed in:6.2.0-1000LSN-0098-1

generic-4.15Ubuntu

Fixed in:4.15.0-69LSN-0098-1

generic-4.4Ubuntu

Fixed in:4.4.0-168LSN-0098-1

Fixed in:4.4.0-211LSN-0098-1

generic-5.15Ubuntu

Fixed in:5.15.0-0LSN-0098-1

generic-5.4Ubuntu

Fixed in:5.4.0-26LSN-0098-1

gkeUbuntu

Fixed in:5.4.0-1033LSN-0098-1

Fixed in:5.15.0-1000LSN-0098-1

gke-5.15Ubuntu

Fixed in:5.15.0-1000LSN-0098-1

gkeopUbuntu

Fixed in:5.4.0-1009LSN-0098-1

hwe-6.2Ubuntu

Fixed in:6.2.0-20LSN-0098-1

ibmUbuntu

Fixed in:5.4.0-1009LSN-0098-1

Fixed in:5.15.0-1000LSN-0098-1

linuxUbuntu

Fixed in:5.4.0-205.225USN-7234-1

Fixed in:5.15.0-82.91USN-6315-1

Fixed in:5.15.0-71LSN-0098-1

linux-awsUbuntu

Fixed in:5.4.0-1139.149USN-7234-4

Fixed in:5.15.0-1043.48USN-6315-1

linux-aws-5.15Ubuntu

Fixed in:5.15.0-1043.48~20.04.1USN-6315-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1139.149~18.04.1USN-7234-5

linux-azureUbuntu

Fixed in:5.4.0-1143.150USN-7234-3

Fixed in:5.15.0-1045.52USN-6332-1

linux-azure-5.15Ubuntu

Fixed in:5.15.0-1045.52~20.04.1USN-6332-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1143.150~18.04.1USN-7234-3

linux-azure-fdeUbuntu

Fixed in:5.15.0-1045.52.1USN-6332-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1098.105USN-7234-1

linux-gcpUbuntu

Fixed in:5.4.0-1142.151USN-7234-1

Fixed in:5.15.0-1040.48USN-6315-1

linux-gcp-5.15Ubuntu

Fixed in:5.15.0-1040.48~20.04.1USN-6330-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1142.151~18.04.1USN-7234-1

linux-gkeUbuntu

Fixed in:5.15.0-1040.45USN-6315-1

linux-gkeopUbuntu

Fixed in:5.15.0-1026.31USN-6315-1

linux-gkeop-5.15Ubuntu

Fixed in:5.15.0-1026.31~20.04.1USN-6325-1

linux-hwe-5.15Ubuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-205.225~18.04.1USN-7234-2

linux-ibmUbuntu

Fixed in:5.4.0-1085.90USN-7234-1

Fixed in:5.15.0-1036.39USN-6315-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1085.90~18.04.1USN-7234-1

linux-image-5.15.0-1026-gkeopUbuntu

Fixed in:5.15.0-1026.31~20.04.1USN-6325-1

Fixed in:5.15.0-1026.31USN-6315-1

linux-image-5.15.0-1031-nvidiaUbuntu

Fixed in:5.15.0-1031.31USN-6315-1

linux-image-5.15.0-1031-nvidia-lowlatencyUbuntu

Fixed in:5.15.0-1031.31USN-6315-1

linux-image-5.15.0-1036-ibmUbuntu

Fixed in:5.15.0-1036.39USN-6315-1

linux-image-5.15.0-1036-raspiUbuntu

Fixed in:5.15.0-1036.39USN-6348-1

linux-image-5.15.0-1038-intel-iotgUbuntu

Fixed in:5.15.0-1038.43~20.04.1USN-6348-1

Fixed in:5.15.0-1038.43USN-6325-1

linux-image-5.15.0-1040-gcpUbuntu

Fixed in:5.15.0-1040.48~20.04.1USN-6330-1

Fixed in:5.15.0-1040.48USN-6315-1

linux-image-5.15.0-1040-gkeUbuntu

Fixed in:5.15.0-1040.45USN-6315-1

linux-image-5.15.0-1040-kvmUbuntu

Fixed in:5.15.0-1040.45USN-6315-1

linux-image-5.15.0-1041-oracleUbuntu

Fixed in:5.15.0-1041.47~20.04.1USN-6315-1

Fixed in:5.15.0-1041.47USN-6315-1

linux-image-5.15.0-1043-awsUbuntu

Fixed in:5.15.0-1043.48~20.04.1USN-6315-1

Fixed in:5.15.0-1043.48USN-6315-1

linux-image-5.15.0-1045-azureUbuntu

Fixed in:5.15.0-1045.52~20.04.1USN-6332-1

Fixed in:5.15.0-1045.52USN-6332-1

linux-image-5.15.0-1045-azure-fdeUbuntu

Fixed in:5.15.0-1045.52.1USN-6332-1

linux-image-5.15.0-82-genericUbuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

Fixed in:5.15.0-82.91USN-6315-1

linux-image-5.15.0-82-generic-64kUbuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

Fixed in:5.15.0-82.91USN-6315-1

linux-image-5.15.0-82-generic-lpaeUbuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

Fixed in:5.15.0-82.91USN-6315-1

linux-image-5.15.0-82-lowlatencyUbuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

Fixed in:5.15.0-82.91USN-6315-1

linux-image-5.15.0-82-lowlatency-64kUbuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

Fixed in:5.15.0-82.91USN-6315-1

linux-image-5.4.0-1048-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-image-5.4.0-1058-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1058.62USN-7295-1

linux-image-5.4.0-1085-ibmUbuntu

Fixed in:5.4.0-1085.90~18.04.1USN-7234-1

Fixed in:5.4.0-1085.90USN-7234-1

linux-image-5.4.0-1098-bluefieldUbuntu

Fixed in:5.4.0-1098.105USN-7234-1

linux-image-5.4.0-1122-raspiUbuntu

Fixed in:5.4.0-1122.134~18.04.1USN-7234-5

Fixed in:5.4.0-1122.134USN-7234-1

linux-image-5.4.0-1126-kvmUbuntu

Fixed in:5.4.0-1126.134USN-7234-1

linux-image-5.4.0-1137-oracleUbuntu

Fixed in:5.4.0-1137.146~18.04.1USN-7234-1

Fixed in:5.4.0-1137.146USN-7234-1

linux-image-5.4.0-1139-awsUbuntu

Fixed in:5.4.0-1139.149~18.04.1USN-7234-5

Fixed in:5.4.0-1139.149USN-7234-4

linux-image-5.4.0-1142-gcpUbuntu

Fixed in:5.4.0-1142.151~18.04.1USN-7234-1

Fixed in:5.4.0-1142.151USN-7234-1

linux-image-5.4.0-1143-azureUbuntu

Fixed in:5.4.0-1143.150~18.04.1USN-7234-3

Fixed in:5.4.0-1143.150USN-7234-3

linux-image-5.4.0-205-genericUbuntu

Fixed in:5.4.0-205.225~18.04.1USN-7234-2

Fixed in:5.4.0-205.225USN-7234-1

linux-image-5.4.0-205-generic-lpaeUbuntu

Fixed in:5.4.0-205.225USN-7234-1

linux-image-5.4.0-205-lowlatencyUbuntu

Fixed in:5.4.0-205.225~18.04.1USN-7234-2

Fixed in:5.4.0-205.225USN-7234-1

linux-image-awsUbuntu

Fixed in:5.4.0.1139.149~18.04.1USN-7234-5

Fixed in:5.15.0.1043.48~20.04.31USN-6315-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1139.136USN-7234-4

linux-image-aws-lts-22.04Ubuntu

Fixed in:5.15.0.1043.42USN-6315-1

linux-image-azureUbuntu

Fixed in:5.4.0.1143.150~18.04.1USN-7234-3

Fixed in:5.15.0.1045.52~20.04.34USN-6332-1

linux-image-azure-cvmUbuntu

Fixed in:5.15.0.1045.52~20.04.34USN-6332-1

linux-image-azure-fde-lts-22.04Ubuntu

Fixed in:5.15.0.1045.52.23USN-6332-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1143.137USN-7234-3

linux-image-azure-lts-22.04Ubuntu

Fixed in:5.15.0.1045.41USN-6332-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1098.94USN-7234-1

linux-image-gcpUbuntu

Fixed in:5.4.0.1142.151~18.04.1USN-7234-1

Fixed in:5.15.0.1040.48~20.04.1USN-6330-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1142.144USN-7234-1

linux-image-gcp-lts-22.04Ubuntu

Fixed in:5.15.0.1040.36USN-6315-1

linux-image-genericUbuntu

Fixed in:5.4.0.205.201USN-7234-1

Fixed in:5.15.0.82.78USN-6315-1

linux-image-generic-64kUbuntu

Fixed in:5.15.0.82.78USN-6315-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.205.201USN-7234-1

Fixed in:5.15.0.82.78USN-6315-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-gkeUbuntu

Fixed in:5.15.0.1040.39USN-6315-1

linux-image-gke-5.15Ubuntu

Fixed in:5.15.0.1040.39USN-6315-1

linux-image-gkeopUbuntu

Fixed in:5.15.0.1026.25USN-6315-1

linux-image-gkeop-5.15Ubuntu

Fixed in:5.15.0.1026.31~20.04.22USN-6325-1

Fixed in:5.15.0.1026.25USN-6315-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1085.90~18.04.1USN-7234-1

Fixed in:5.15.0.1036.32USN-6315-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1085.114USN-7234-1

linux-image-intelUbuntu

Fixed in:5.15.0.1038.43~20.04.28USN-6348-1

linux-image-intel-iotgUbuntu

Fixed in:5.15.0.1038.43~20.04.28USN-6348-1

Fixed in:5.15.0.1038.37USN-6325-1

linux-image-kvmUbuntu

Fixed in:5.4.0.1126.122USN-7234-1

Fixed in:5.15.0.1040.36USN-6315-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.205.201USN-7234-1

Fixed in:5.15.0.82.84USN-6315-1

linux-image-lowlatency-64kUbuntu

Fixed in:5.15.0.82.84USN-6315-1

linux-image-lowlatency-64k-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.37USN-6315-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.37USN-6315-1

linux-image-nvidiaUbuntu

Fixed in:5.15.0.1031.31USN-6315-1

linux-image-nvidia-lowlatencyUbuntu

Fixed in:5.15.0.1031.31USN-6315-1

linux-image-oemUbuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

Fixed in:5.4.0.205.201USN-7234-1

linux-image-oem-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-oem-20.04bUbuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-oem-20.04cUbuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-oem-20.04dUbuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

Fixed in:5.4.0.205.201USN-7234-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1137.146~18.04.1USN-7234-1

Fixed in:5.15.0.1041.47~20.04.1USN-6315-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1137.130USN-7234-1

linux-image-oracle-lts-22.04Ubuntu

Fixed in:5.15.0.1041.36USN-6315-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1122.152USN-7234-1

Fixed in:5.15.0.1036.34USN-6348-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1122.134~18.04.1USN-7234-5

linux-image-raspi-nolpaeUbuntu

Fixed in:5.15.0.1036.34USN-6348-1

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1122.152USN-7234-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

linux-image-virtualUbuntu

Fixed in:5.4.0.205.201USN-7234-1

Fixed in:5.15.0.82.78USN-6315-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.205.225~18.04.1USN-7234-2

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.15.0.82.91~20.04.40USN-6315-1

linux-image-xilinx-zynqmpUbuntu

Fixed in:5.4.0.1058.58USN-7295-1

linux-intel-iotgUbuntu

Fixed in:5.15.0-1038.43USN-6325-1

linux-intel-iotg-5.15Ubuntu

Fixed in:5.15.0-1038.43~20.04.1USN-6348-1

linux-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-kvmUbuntu

Fixed in:5.4.0-1126.134USN-7234-1

Fixed in:5.15.0-1040.45USN-6315-1

linux-lowlatencyUbuntu

Fixed in:5.15.0-82.91USN-6315-1

linux-lowlatency-hwe-5.15Ubuntu

Fixed in:5.15.0-82.91~20.04.1USN-6315-1

linux-nvidiaUbuntu

Fixed in:5.15.0-1031.31USN-6315-1

linux-oracleUbuntu

Fixed in:5.4.0-1137.146USN-7234-1

Fixed in:5.15.0-1041.47USN-6315-1

linux-oracle-5.15Ubuntu

Fixed in:5.15.0-1041.47~20.04.1USN-6315-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1137.146~18.04.1USN-7234-1

linux-raspiUbuntu

Fixed in:5.4.0-1122.134USN-7234-1

Fixed in:5.15.0-1036.39USN-6348-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1122.134~18.04.1USN-7234-5

linux-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1058.62USN-7295-1

lowlatency-4.15Ubuntu

Fixed in:4.15.0-69LSN-0098-1

lowlatency-4.4Ubuntu

Fixed in:4.4.0-168LSN-0098-1

Fixed in:4.4.0-211LSN-0098-1

lowlatency-5.15Ubuntu

Fixed in:5.15.0-0LSN-0098-1

lowlatency-5.4Ubuntu

Fixed in:5.4.0-26LSN-0098-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Exploit1

openwall.com

Vendor Advisory1

source.android.com

Third-Party Advisory5

Mailing List1

openwall.com

Other references1

security.netapp.com

Related Vulnerabilities

Other CWE-667 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-10072	High	7.5	73%	-	Fix
CVE-2002-1850	High	7.5	17%	-	Fix
CVE-2009-2699	High	7.5	14%	-	Fix
CVE-2004-0174	High	7.5	12%	-	-
CVE-2009-4272	High	7.5	11%	-	-
CVE-2020-24606	High	8.6	5.2%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-02-13.