Is CVE-2021-26931 in the CISA KEV catalog?

No. CVE-2021-26931 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26931?

CVE-2021-26931 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-26931?

CVE-2021-26931 has an EPSS score of 0.54% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26931?

Upgrade linux on debian 11 to 5.10.19-1 or later. Fixes are available for 110 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26931

MEDIUM

5.5

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.19-1CVE-2021-26931

linuxUbuntu

Fixed in:4.4.0-208.240USN-4904-1

Fixed in:4.15.0-143.147USN-4946-1

Fixed in:5.4.0-71.79USN-4909-1

linux-awsUbuntu

Fixed in:4.4.0-1090.94USN-4904-1

Fixed in:4.4.0-1126.140USN-4904-1

Fixed in:4.15.0-1102.109USN-4946-1

Fixed in:5.4.0-1043.45USN-4909-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4909-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1102.109~16.04.1USN-4946-1

linux-azureUbuntu

Fixed in:4.15.0-1114.127~14.04.1USN-4946-1

Fixed in:5.4.0-1044.46USN-4909-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1114.127USN-4946-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4909-1

linux-dell300xUbuntu

Fixed in:4.15.0-1018.22USN-4946-1

linux-gcpUbuntu

Fixed in:4.15.0-1099.112~16.04.1USN-4946-1

Fixed in:5.4.0-1041.44USN-4909-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1099.112USN-4946-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4909-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4909-1

linux-gkeopUbuntu

Fixed in:5.4.0-1013.14USN-4909-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1013.14~18.04.1USN-4909-1

linux-hweUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-53.60~20.04.1USN-4949-1

linux-image-4.15.0-1018-dell300xUbuntu

Fixed in:4.15.0-1018.22USN-4946-1

linux-image-4.15.0-1071-oracleUbuntu

Fixed in:4.15.0-1071.79~16.04.1USN-4946-1

Fixed in:4.15.0-1071.79USN-4946-1

linux-image-4.15.0-1085-raspi2Ubuntu

Fixed in:4.15.0-1085.90USN-4946-1

linux-image-4.15.0-1091-kvmUbuntu

Fixed in:4.15.0-1091.93USN-4946-1

linux-image-4.15.0-1099-gcpUbuntu

Fixed in:4.15.0-1099.112~16.04.1USN-4946-1

Fixed in:4.15.0-1099.112USN-4946-1

linux-image-4.15.0-1102-awsUbuntu

Fixed in:4.15.0-1102.109~16.04.1USN-4946-1

Fixed in:4.15.0-1102.109USN-4946-1

linux-image-4.15.0-1102-snapdragonUbuntu

Fixed in:4.15.0-1102.111USN-4946-1

linux-image-4.15.0-1114-azureUbuntu

Fixed in:4.15.0-1114.127~14.04.1USN-4946-1

Fixed in:4.15.0-1114.127USN-4946-1

linux-image-4.15.0-143-genericUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.15.0-143-generic-lpaeUbuntu

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.15.0-143-lowlatencyUbuntu

Fixed in:4.15.0-143.147~16.04.3USN-4946-1

Fixed in:4.15.0-143.147USN-4946-1

linux-image-4.4.0-1090-awsUbuntu

Fixed in:4.4.0-1090.94USN-4904-1

linux-image-4.4.0-1091-kvmUbuntu

Fixed in:4.4.0-1091.100USN-4904-1

linux-image-4.4.0-1126-awsUbuntu

Fixed in:4.4.0-1126.140USN-4904-1

linux-image-4.4.0-1150-raspi2Ubuntu

Fixed in:4.4.0-1150.161USN-4904-1

linux-image-4.4.0-1154-snapdragonUbuntu

Fixed in:4.4.0-1154.164USN-4904-1

linux-image-4.4.0-208-genericUbuntu

Fixed in:4.4.0-208.240~14.04.1USN-4904-1

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-generic-lpaeUbuntu

Fixed in:4.4.0-208.240~14.04.1USN-4904-1

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-lowlatencyUbuntu

Fixed in:4.4.0-208.240~14.04.1USN-4904-1

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-powerpc-e500mcUbuntu

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-powerpc-smpUbuntu

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-powerpc64-embUbuntu

Fixed in:4.4.0-208.240USN-4904-1

linux-image-4.4.0-208-powerpc64-smpUbuntu

Fixed in:4.4.0-208.240USN-4904-1

linux-image-5.4.0-1013-gkeopUbuntu

Fixed in:5.4.0-1013.14~18.04.1USN-4909-1

Fixed in:5.4.0-1013.14USN-4909-1

linux-image-5.4.0-1033-raspiUbuntu

Fixed in:5.4.0-1033.36~18.04.1USN-4909-1

Fixed in:5.4.0-1033.36USN-4909-1

linux-image-5.4.0-1037-kvmUbuntu

Fixed in:5.4.0-1037.38USN-4909-1

linux-image-5.4.0-1040-gkeUbuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4909-1

linux-image-5.4.0-1041-gcpUbuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4909-1

Fixed in:5.4.0-1041.44USN-4909-1

linux-image-5.4.0-1042-oracleUbuntu

Fixed in:5.4.0-1042.45~18.04.1USN-4909-1

Fixed in:5.4.0-1042.45USN-4909-1

linux-image-5.4.0-1043-awsUbuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4909-1

Fixed in:5.4.0-1043.45USN-4909-1

linux-image-5.4.0-1044-azureUbuntu

Fixed in:5.4.0-1044.46~18.04.1USN-4909-1

Fixed in:5.4.0-1044.46USN-4909-1

linux-image-5.4.0-71-genericUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.4.0-71-generic-lpaeUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.4.0-71-lowlatencyUbuntu

Fixed in:5.4.0-71.79~18.04.1USN-4909-1

Fixed in:5.4.0-71.79USN-4909-1

linux-image-5.8.0-53-genericUbuntu

Fixed in:5.8.0-53.60~20.04.1USN-4949-1

linux-image-5.8.0-53-generic-64kUbuntu

Fixed in:5.8.0-53.60~20.04.1USN-4949-1

linux-image-5.8.0-53-generic-lpaeUbuntu

Fixed in:5.8.0-53.60~20.04.1USN-4949-1

linux-image-5.8.0-53-lowlatencyUbuntu

Fixed in:5.8.0-53.60~20.04.1USN-4949-1

linux-image-awsUbuntu

Fixed in:4.4.0.1090.87USN-4904-1

Fixed in:4.4.0.1126.131USN-4904-1

Fixed in:5.4.0.1043.26USN-4909-1

Fixed in:5.4.0.1043.44USN-4909-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1102.93USN-4946-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1102.105USN-4946-1

linux-image-azureUbuntu

Fixed in:4.15.0.1114.87USN-4946-1

Fixed in:5.4.0.1044.24USN-4909-1

Fixed in:5.4.0.1044.42USN-4909-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1114.87USN-4946-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1018.20USN-4946-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1099.100USN-4946-1

Fixed in:5.4.0.1041.28USN-4909-1

Fixed in:5.4.0.1041.50USN-4909-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1099.117USN-4946-1

linux-image-genericUbuntu

Fixed in:4.4.0.208.214USN-4904-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.71.74USN-4909-1

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

Fixed in:5.8.0.53.60~20.04.37USN-4949-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.53.60~20.04.37USN-4949-1

linux-image-generic-lpaeUbuntu

Fixed in:4.4.0.208.214USN-4904-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

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

Fixed in:5.8.0.53.60~20.04.37USN-4949-1

linux-image-generic-lpae-lts-xenialUbuntu

Fixed in:4.4.0.208.181USN-4904-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.208.181USN-4904-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1099.100USN-4946-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1040.42~18.04.7USN-4909-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1013.16USN-4909-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1013.14~18.04.14USN-4909-1

Fixed in:5.4.0.1013.16USN-4909-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1091.89USN-4904-1

Fixed in:4.15.0.1091.87USN-4946-1

Fixed in:5.4.0.1037.35USN-4909-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.208.214USN-4904-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.53.60~20.04.37USN-4949-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.208.181USN-4904-1

linux-image-oemUbuntu

Fixed in:4.15.0.143.139USN-4946-1

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1071.59USN-4946-1

Fixed in:5.4.0.1042.45~18.04.24USN-4909-1

Fixed in:5.4.0.1042.39USN-4909-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1071.81USN-4946-1

linux-image-powerpc-e500mcUbuntu

Fixed in:4.4.0.208.214USN-4904-1

linux-image-powerpc-smpUbuntu

Fixed in:4.4.0.208.214USN-4904-1

linux-image-powerpc64-embUbuntu

Fixed in:4.4.0.208.214USN-4904-1

linux-image-powerpc64-smpUbuntu

Fixed in:4.4.0.208.214USN-4904-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1033.68USN-4909-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1033.35USN-4909-1

linux-image-raspi2Ubuntu

Fixed in:4.4.0.1150.150USN-4904-1

Fixed in:4.15.0.1085.82USN-4946-1

Fixed in:5.4.0.1033.68USN-4909-1

linux-image-snapdragonUbuntu

Fixed in:4.4.0.1154.146USN-4904-1

Fixed in:4.15.0.1102.105USN-4946-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-virtualUbuntu

Fixed in:4.4.0.208.214USN-4904-1

Fixed in:4.15.0.143.130USN-4946-1

Fixed in:5.4.0.71.74USN-4909-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.143.139USN-4946-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.71.79~18.04.64USN-4909-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.53.60~20.04.37USN-4949-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.208.181USN-4904-1

linux-kvmUbuntu

Fixed in:4.4.0-1091.100USN-4904-1

Fixed in:4.15.0-1091.93USN-4946-1

Fixed in:5.4.0-1037.38USN-4909-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-208.240~14.04.1USN-4904-1

linux-oracleUbuntu

Fixed in:4.15.0-1071.79~16.04.1USN-4946-1

Fixed in:4.15.0-1071.79USN-4946-1

Fixed in:5.4.0-1042.45USN-4909-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1042.45~18.04.1USN-4909-1

linux-raspiUbuntu

Fixed in:5.4.0-1033.36USN-4909-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1033.36~18.04.1USN-4909-1

linux-raspi2Ubuntu

Fixed in:4.4.0-1150.161USN-4904-1

Fixed in:4.15.0-1085.90USN-4946-1

linux-snapdragonUbuntu

Fixed in:4.4.0-1154.164USN-4904-1

Fixed in:4.15.0-1102.111USN-4946-1

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.54%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Patch1

xenbits.xen.org

Third-Party Advisory3

Other references5

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	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 2024-11-21.