Is CVE-2025-21687 in the CISA KEV catalog?

No. CVE-2025-21687 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-21687?

CVE-2025-21687 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2025-21687?

CVE-2025-21687 has an EPSS score of 0.22% (12th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-21687?

Upgrade linux on debian 11 to 5.10.234-1 or later. Fixes are available for 158 affected products.

CVE & CISA-KEV Catalog

CVE-2025-21687

HIGH

7.8

CVSS v3

NVD

Description

In the Linux kernel, the following vulnerability has been resolved: vfio/platform: check the bounds of read/write syscalls count and offset are passed from user space and not checked, only offset is capped to 40 bits, which can be used to read/write out of bounds of the device.

CWE-125Out-of-bounds Read CWE-787Out-of-bounds Write

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.234-1CVE-2025-21687

Fixed in:6.1.128-1CVE-2025-21687

Fixed in:6.12.12-1CVE-2025-21687

linuxUbuntu

Fixed in:5.4.0-211.231USN-7391-1

Fixed in:5.15.0-135.146USN-7387-1

linux-awsUbuntu

Fixed in:5.4.0-1142.152USN-7392-3

Fixed in:5.15.0-1080.87USN-7387-1

linux-aws-5.15Ubuntu

Fixed in:5.15.0-1080.87~20.04.1USN-7388-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1142.152~18.04.1USN-7401-1

linux-aws-fipsUbuntu

Fixed in:5.4.0-1142.153+fips1USN-7392-4

Fixed in:5.15.0-1080.87+fips1USN-7387-2

linux-azureUbuntu

Fixed in:5.4.0-1147.154USN-7392-1

Fixed in:5.15.0-1084.93USN-7387-1

linux-azure-5.15Ubuntu

Fixed in:5.15.0-1086.95~20.04.1USN-7421-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1147.154~18.04.1USN-7392-1

linux-azure-fde-5.15Ubuntu

Fixed in:5.15.0-1086.95~20.04.1.1USN-7421-1

linux-azure-fipsUbuntu

Fixed in:5.4.0-1147.154+fips1USN-7392-2

Fixed in:5.15.0-1083.92+fips1USN-7387-2

linux-bluefieldUbuntu

Fixed in:5.4.0-1101.108USN-7392-1

linux-fipsUbuntu

Fixed in:5.4.0-1116.126USN-7393-1

Fixed in:5.15.0-135.146+fips1USN-7387-2

linux-gcpUbuntu

Fixed in:5.4.0-1145.154USN-7392-1

Fixed in:5.15.0-1079.88USN-7387-1

linux-gcp-5.15Ubuntu

Fixed in:5.15.0-1081.90~20.04.1USN-7459-2

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1145.154~18.04.1USN-7392-1

linux-gcp-fipsUbuntu

Fixed in:5.4.0-1145.154+fips1USN-7392-2

Fixed in:5.15.0-1079.88+fips1USN-7387-2

linux-gkeUbuntu

Fixed in:5.15.0-1077.83USN-7387-1

linux-gkeopUbuntu

Fixed in:5.15.0-1062.70USN-7387-1

linux-hwe-5.15Ubuntu

Fixed in:5.15.0-136.147~20.04.1USN-7407-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-211.231~18.04.1USN-7391-1

linux-ibmUbuntu

Fixed in:5.4.0-1088.93USN-7392-1

Fixed in:5.15.0-1072.75USN-7387-1

linux-ibm-5.15Ubuntu

Fixed in:5.15.0-1074.77~20.04.1USN-7458-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1090.95~18.04.1USN-7463-1

linux-image-5.15.0-1021-nvidia-tegra-igxUbuntu

Fixed in:5.15.0-1021.21USN-7389-1

linux-image-5.15.0-1021-nvidia-tegra-igx-rtUbuntu

Fixed in:5.15.0-1021.21USN-7389-1

linux-image-5.15.0-1033-nvidia-tegraUbuntu

Fixed in:5.15.0-1033.33USN-7389-1

linux-image-5.15.0-1033-nvidia-tegra-rtUbuntu

Fixed in:5.15.0-1033.33USN-7389-1

linux-image-5.15.0-1044-xilinx-zynqmpUbuntu

Fixed in:5.15.0-1044.48USN-7390-1

linux-image-5.15.0-1062-gkeopUbuntu

Fixed in:5.15.0-1062.70USN-7387-1

linux-image-5.15.0-1072-ibmUbuntu

Fixed in:5.15.0-1072.75USN-7387-1

linux-image-5.15.0-1073-intel-iot-realtimeUbuntu

Fixed in:5.15.0-1073.75USN-7387-3

linux-image-5.15.0-1074-ibmUbuntu

Fixed in:5.15.0-1074.77~20.04.1USN-7458-1

linux-image-5.15.0-1074-nvidiaUbuntu

Fixed in:5.15.0-1074.75USN-7387-1

linux-image-5.15.0-1074-nvidia-lowlatencyUbuntu

Fixed in:5.15.0-1074.75USN-7387-1

linux-image-5.15.0-1074-raspiUbuntu

Fixed in:5.15.0-1074.77USN-7387-1

linux-image-5.15.0-1075-intel-iotgUbuntu

Fixed in:5.15.0-1075.81USN-7387-1

linux-image-5.15.0-1076-kvmUbuntu

Fixed in:5.15.0-1076.81USN-7388-1

linux-image-5.15.0-1077-gkeUbuntu

Fixed in:5.15.0-1077.83USN-7387-1

linux-image-5.15.0-1077-intel-iotgUbuntu

Fixed in:5.15.0-1077.83~20.04.1USN-7459-1

linux-image-5.15.0-1077-oracleUbuntu

Fixed in:5.15.0-1077.83~20.04.1USN-7387-1

Fixed in:5.15.0-1077.83USN-7387-1

linux-image-5.15.0-1079-gcpUbuntu

Fixed in:5.15.0-1079.88USN-7387-1

linux-image-5.15.0-1079-gcp-fipsUbuntu

Fixed in:5.15.0-1079.88+fips1USN-7387-2

linux-image-5.15.0-1080-awsUbuntu

Fixed in:5.15.0-1080.87~20.04.1USN-7388-1

Fixed in:5.15.0-1080.87USN-7387-1

linux-image-5.15.0-1080-aws-fipsUbuntu

Fixed in:5.15.0-1080.87+fips1USN-7387-2

linux-image-5.15.0-1080-realtimeUbuntu

Fixed in:5.15.0-1080.88USN-7387-3

linux-image-5.15.0-1081-gcpUbuntu

Fixed in:5.15.0-1081.90~20.04.1USN-7459-2

linux-image-5.15.0-1083-azure-fipsUbuntu

Fixed in:5.15.0-1083.92+fips1USN-7387-2

linux-image-5.15.0-1084-azureUbuntu

Fixed in:5.15.0-1084.93USN-7387-1

linux-image-5.15.0-1086-azureUbuntu

Fixed in:5.15.0-1086.95~20.04.1USN-7421-1

linux-image-5.15.0-1086-azure-fdeUbuntu

Fixed in:5.15.0-1086.95~20.04.1.1USN-7421-1

linux-image-5.15.0-135-fipsUbuntu

Fixed in:5.15.0-135.146+fips1USN-7387-2

linux-image-5.15.0-135-genericUbuntu

Fixed in:5.15.0-135.146USN-7387-1

linux-image-5.15.0-135-generic-64kUbuntu

Fixed in:5.15.0-135.146USN-7387-1

linux-image-5.15.0-135-generic-lpaeUbuntu

Fixed in:5.15.0-135.146USN-7387-1

linux-image-5.15.0-135-lowlatencyUbuntu

Fixed in:5.15.0-135.146~20.04.1USN-7387-1

Fixed in:5.15.0-135.146USN-7387-1

linux-image-5.15.0-135-lowlatency-64kUbuntu

Fixed in:5.15.0-135.146~20.04.1USN-7387-1

Fixed in:5.15.0-135.146USN-7387-1

linux-image-5.15.0-136-genericUbuntu

Fixed in:5.15.0-136.147~20.04.1USN-7407-1

linux-image-5.15.0-136-generic-64kUbuntu

Fixed in:5.15.0-136.147~20.04.1USN-7407-1

linux-image-5.15.0-136-generic-lpaeUbuntu

Fixed in:5.15.0-136.147~20.04.1USN-7407-1

linux-image-5.4.0-1048-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-image-5.4.0-1060-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1060.64USN-7392-1

linux-image-5.4.0-1088-ibmUbuntu

Fixed in:5.4.0-1088.93USN-7392-1

linux-image-5.4.0-1090-ibmUbuntu

Fixed in:5.4.0-1090.95~18.04.1USN-7463-1

linux-image-5.4.0-1101-bluefieldUbuntu

Fixed in:5.4.0-1101.108USN-7392-1

linux-image-5.4.0-1116-fipsUbuntu

Fixed in:5.4.0-1116.126USN-7393-1

linux-image-5.4.0-1129-kvmUbuntu

Fixed in:5.4.0-1129.138USN-7392-1

linux-image-5.4.0-1129-raspiUbuntu

Fixed in:5.4.0-1129.142~18.04.1USN-7540-1

Fixed in:5.4.0-1129.142USN-7539-1

linux-image-5.4.0-1140-oracleUbuntu

Fixed in:5.4.0-1140.149~18.04.1USN-7392-1

Fixed in:5.4.0-1140.150USN-7392-1

linux-image-5.4.0-1142-awsUbuntu

Fixed in:5.4.0-1142.152~18.04.1USN-7401-1

Fixed in:5.4.0-1142.152USN-7392-3

linux-image-5.4.0-1142-aws-fipsUbuntu

Fixed in:5.4.0-1142.153+fips1USN-7392-4

linux-image-5.4.0-1145-gcpUbuntu

Fixed in:5.4.0-1145.154~18.04.1USN-7392-1

Fixed in:5.4.0-1145.154USN-7392-1

linux-image-5.4.0-1145-gcp-fipsUbuntu

Fixed in:5.4.0-1145.154+fips1USN-7392-2

linux-image-5.4.0-1147-azureUbuntu

Fixed in:5.4.0-1147.154~18.04.1USN-7392-1

Fixed in:5.4.0-1147.154USN-7392-1

linux-image-5.4.0-1147-azure-fipsUbuntu

Fixed in:5.4.0-1147.154+fips1USN-7392-2

linux-image-5.4.0-211-genericUbuntu

Fixed in:5.4.0-211.231~18.04.1USN-7391-1

Fixed in:5.4.0-211.231USN-7391-1

linux-image-5.4.0-211-generic-lpaeUbuntu

Fixed in:5.4.0-211.231USN-7391-1

linux-image-5.4.0-211-lowlatencyUbuntu

Fixed in:5.4.0-211.231~18.04.1USN-7391-1

Fixed in:5.4.0-211.231USN-7391-1

linux-image-awsUbuntu

Fixed in:5.4.0.1142.152~18.04.1USN-7401-1

Fixed in:5.15.0.1080.87~20.04.1USN-7388-1

linux-image-aws-fipsUbuntu

Fixed in:5.4.0.1142.89USN-7392-4

Fixed in:5.15.0.1080.76USN-7387-2

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1142.139USN-7392-3

linux-image-aws-lts-22.04Ubuntu

Fixed in:5.15.0.1080.82USN-7387-1

linux-image-azureUbuntu

Fixed in:5.4.0.1147.154~18.04.1USN-7392-1

Fixed in:5.15.0.1086.95~20.04.1USN-7421-1

linux-image-azure-cvmUbuntu

Fixed in:5.15.0.1086.95~20.04.1USN-7421-1

linux-image-azure-fdeUbuntu

Fixed in:5.15.0.1086.95~20.04.1.61USN-7421-1

linux-image-azure-fipsUbuntu

Fixed in:5.4.0.1147.85USN-7392-2

Fixed in:5.15.0.1083.70USN-7387-2

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1147.141USN-7392-1

linux-image-azure-lts-22.04Ubuntu

Fixed in:5.15.0.1084.82USN-7387-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1101.97USN-7392-1

linux-image-fipsUbuntu

Fixed in:5.4.0.1116.113USN-7393-1

Fixed in:5.15.0.135.76USN-7387-2

linux-image-gcpUbuntu

Fixed in:5.4.0.1145.154~18.04.1USN-7392-1

Fixed in:5.15.0.1081.90~20.04.1USN-7459-2

linux-image-gcp-fipsUbuntu

Fixed in:5.4.0.1145.87USN-7392-2

Fixed in:5.15.0.1079.69USN-7387-2

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1145.147USN-7392-1

linux-image-gcp-lts-22.04Ubuntu

Fixed in:5.15.0.1079.75USN-7387-1

linux-image-genericUbuntu

Fixed in:5.4.0.211.206USN-7391-1

Fixed in:5.15.0.135.133USN-7387-1

linux-image-generic-64kUbuntu

Fixed in:5.15.0.135.133USN-7387-1

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

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.211.206USN-7391-1

Fixed in:5.15.0.135.133USN-7387-1

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

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-gkeUbuntu

Fixed in:5.15.0.1077.76USN-7387-1

linux-image-gke-5.15Ubuntu

Fixed in:5.15.0.1077.76USN-7387-1

linux-image-gkeopUbuntu

Fixed in:5.15.0.1062.61USN-7387-1

linux-image-gkeop-5.15Ubuntu

Fixed in:5.15.0.1062.61USN-7387-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1090.95~18.04.1USN-7463-1

Fixed in:5.15.0.1074.77~20.04.1USN-7458-1

Fixed in:5.15.0.1072.68USN-7387-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1088.117USN-7392-1

linux-image-intelUbuntu

Fixed in:5.15.0.1077.83~20.04.1USN-7459-1

linux-image-intel-iot-realtimeUbuntu

Fixed in:5.15.0.1073.77USN-7387-3

linux-image-intel-iotgUbuntu

Fixed in:5.15.0.1077.83~20.04.1USN-7459-1

Fixed in:5.15.0.1075.75USN-7387-1

linux-image-kvmUbuntu

Fixed in:5.4.0.1129.125USN-7392-1

Fixed in:5.15.0.1076.72USN-7388-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.211.206USN-7391-1

Fixed in:5.15.0.135.122USN-7387-1

linux-image-lowlatency-64kUbuntu

Fixed in:5.15.0.135.122USN-7387-1

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

Fixed in:5.15.0.135.146~20.04.1USN-7387-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.15.0.135.146~20.04.1USN-7387-1

linux-image-nvidiaUbuntu

Fixed in:5.15.0.1074.74USN-7387-1

linux-image-nvidia-lowlatencyUbuntu

Fixed in:5.15.0.1074.74USN-7387-1

linux-image-nvidia-tegraUbuntu

Fixed in:5.15.0.1033.33USN-7389-1

linux-image-nvidia-tegra-igxUbuntu

Fixed in:5.15.0.1021.23USN-7389-1

linux-image-nvidia-tegra-igx-rtUbuntu

Fixed in:5.15.0.1021.23USN-7389-1

linux-image-nvidia-tegra-rtUbuntu

Fixed in:5.15.0.1033.33USN-7389-1

linux-image-oemUbuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

Fixed in:5.4.0.211.206USN-7391-1

linux-image-oem-20.04Ubuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-oem-20.04bUbuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-oem-20.04cUbuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-oem-20.04dUbuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

Fixed in:5.4.0.211.206USN-7391-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1140.149~18.04.1USN-7392-1

Fixed in:5.15.0.1077.83~20.04.1USN-7387-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1140.134USN-7392-1

linux-image-oracle-lts-22.04Ubuntu

Fixed in:5.15.0.1077.73USN-7387-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1129.160USN-7539-1

Fixed in:5.15.0.1074.72USN-7387-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1129.142~18.04.1USN-7540-1

linux-image-raspi-nolpaeUbuntu

Fixed in:5.15.0.1074.72USN-7387-1

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1129.160USN-7539-1

linux-image-realtimeUbuntu

Fixed in:5.15.0.1080.83USN-7387-3

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

linux-image-virtualUbuntu

Fixed in:5.4.0.211.206USN-7391-1

Fixed in:5.15.0.135.133USN-7387-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.211.231~18.04.1USN-7391-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.15.0.136.147~20.04.1USN-7407-1

linux-image-xilinx-zynqmpUbuntu

Fixed in:5.4.0.1060.60USN-7392-1

Fixed in:5.15.0.1044.48USN-7390-1

linux-intel-iot-realtimeUbuntu

Fixed in:5.15.0-1073.75USN-7387-3

linux-intel-iotgUbuntu

Fixed in:5.15.0-1075.81USN-7387-1

linux-intel-iotg-5.15Ubuntu

Fixed in:5.15.0-1077.83~20.04.1USN-7459-1

linux-iotUbuntu

Fixed in:5.4.0-1048.51USN-7413-1

linux-kvmUbuntu

Fixed in:5.4.0-1129.138USN-7392-1

Fixed in:5.15.0-1076.81USN-7388-1

linux-lowlatencyUbuntu

Fixed in:5.15.0-135.146USN-7387-1

linux-lowlatency-hwe-5.15Ubuntu

Fixed in:5.15.0-135.146~20.04.1USN-7387-1

linux-nvidiaUbuntu

Fixed in:5.15.0-1074.75USN-7387-1

linux-nvidia-tegraUbuntu

Fixed in:5.15.0-1033.33USN-7389-1

linux-nvidia-tegra-igxUbuntu

Fixed in:5.15.0-1021.21USN-7389-1

linux-oracleUbuntu

Fixed in:5.4.0-1140.150USN-7392-1

Fixed in:5.15.0-1077.83USN-7387-1

linux-oracle-5.15Ubuntu

Fixed in:5.15.0-1077.83~20.04.1USN-7387-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1140.149~18.04.1USN-7392-1

linux-raspiUbuntu

Fixed in:5.4.0-1129.142USN-7539-1

Fixed in:5.15.0-1074.77USN-7387-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1129.142~18.04.1USN-7540-1

linux-realtimeUbuntu

Fixed in:5.15.0-1080.88USN-7387-3

linux-xilinx-zynqmpUbuntu

Fixed in:5.4.0-1060.64USN-7392-1

Fixed in:5.15.0-1044.48USN-7390-1

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Patch9

Other references5

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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 2025-11-03.