Is CVE-2025-37879 in the CISA KEV catalog?

No. CVE-2025-37879 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-37879?

CVE-2025-37879 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2025-37879?

CVE-2025-37879 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-37879?

Upgrade linux on debian 12 to 6.1.137-1 or later. Fixes are available for 140 affected products.

CVE & CISA-KEV Catalog

CVE-2025-37879

HIGH

7.1

CVSS v3

NVD

Description

In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)

CWE-125Out-of-bounds Read

How to fix

Remediation Available

linuxDebian

Fixed in:6.1.137-1CVE-2025-37879

Fixed in:6.12.27-1CVE-2025-37879

linuxUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-awsUbuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-aws-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-aws-fipsUbuntu

Fixed in:6.8.0-1046.49+fips1USN-8028-4

linux-azureUbuntu

Fixed in:6.8.0-1046.52USN-8074-1

linux-azure-6.8Ubuntu

Fixed in:6.8.0-1051.57~22.04.1USN-8126-1

linux-azure-fipsUbuntu

Fixed in:6.8.0-1046.52+fips1USN-8074-2

linux-fipsUbuntu

Fixed in:6.8.0-100.100+fips1USN-8028-4

linux-gcpUbuntu

Fixed in:6.8.0-1047.50USN-8031-3

linux-gcp-6.8Ubuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

linux-gcp-fipsUbuntu

Fixed in:6.8.0-1047.50+fips1USN-8031-2

linux-gkeUbuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-gkeopUbuntu

Fixed in:6.8.0-1030.33USN-8028-5

linux-hwe-6.8Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-ibmUbuntu

Fixed in:6.8.0-1044.44USN-8028-8

linux-ibm-6.8Ubuntu

Fixed in:6.8.0-1044.44~22.04.1USN-8028-8

linux-image-6.8.0-100-fipsUbuntu

Fixed in:6.8.0-100.100+fips1USN-8028-4

linux-image-6.8.0-100-genericUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

Fixed in:6.8.0-100.100USN-8028-1

linux-image-6.8.0-100-generic-64kUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

Fixed in:6.8.0-100.100USN-8028-1

linux-image-6.8.0-100-lowlatencyUbuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-6.8.0-100-lowlatency-64kUbuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-6.8.0-1023-xilinxUbuntu

Fixed in:6.8.0-1023.24USN-8052-2

linux-image-6.8.0-1030-gkeopUbuntu

Fixed in:6.8.0-1030.33USN-8028-5

linux-image-6.8.0-1043-gkeUbuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-6.8.0-1043-gke-64kUbuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-6.8.0-1043-oracleUbuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-6.8.0-1043-oracle-64kUbuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-6.8.0-1044-ibmUbuntu

Fixed in:6.8.0-1044.44~22.04.1USN-8028-8

Fixed in:6.8.0-1044.44USN-8028-8

linux-image-6.8.0-1046-awsUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-6.8.0-1046-aws-64kUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-6.8.0-1046-aws-fipsUbuntu

Fixed in:6.8.0-1046.49+fips1USN-8028-4

linux-image-6.8.0-1046-azureUbuntu

Fixed in:6.8.0-1046.52USN-8074-1

linux-image-6.8.0-1046-azure-fipsUbuntu

Fixed in:6.8.0-1046.52+fips1USN-8074-2

linux-image-6.8.0-1046-nvidiaUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-6.8.0-1046-nvidia-64kUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-6.8.0-1046-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-6.8.0-1046-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-6.8.0-1047-gcpUbuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-6.8.0-1047-gcp-64kUbuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-6.8.0-1047-gcp-fipsUbuntu

Fixed in:6.8.0-1047.50+fips1USN-8031-2

linux-image-6.8.0-1047-raspiUbuntu

Fixed in:6.8.0-1047.51USN-8028-1

linux-image-6.8.0-1051-azureUbuntu

Fixed in:6.8.0-1051.57~22.04.1USN-8126-1

linux-image-6.8.0-2037-raspi-realtimeUbuntu

Fixed in:6.8.0-2037.38USN-8028-3

linux-image-6.8.1-1041-realtimeUbuntu

Fixed in:6.8.1-1041.42~22.04.1USN-8028-2

Fixed in:6.8.1-1041.42USN-8028-3

linux-image-awsUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-image-aws-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-aws-64kUbuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-image-aws-64k-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-aws-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-aws-fipsUbuntu

Fixed in:6.8.0-1046.49+fips1USN-8028-4

linux-image-aws-fips-6.8Ubuntu

Fixed in:6.8.0-1046.49+fips1USN-8028-4

linux-image-aws-lts-24.04Ubuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-azureUbuntu

Fixed in:6.8.0-1051.57~22.04.1USN-8126-1

linux-image-azure-6.8Ubuntu

Fixed in:6.8.0-1051.57~22.04.1USN-8126-1

Fixed in:6.8.0-1046.52USN-8074-1

linux-image-azure-fipsUbuntu

Fixed in:6.8.0-1046.52+fips1USN-8074-2

linux-image-azure-fips-6.8Ubuntu

Fixed in:6.8.0-1046.52+fips1USN-8074-2

linux-image-azure-lts-24.04Ubuntu

Fixed in:6.8.0-1046.52USN-8074-1

linux-image-fipsUbuntu

Fixed in:6.8.0-100.100+fips1USN-8028-4

linux-image-fips-6.8Ubuntu

Fixed in:6.8.0-100.100+fips1USN-8028-4

linux-image-gcpUbuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

linux-image-gcp-6.8Ubuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-gcp-64kUbuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

linux-image-gcp-64k-6.8Ubuntu

Fixed in:6.8.0-1047.50~22.04.2USN-8031-1

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-gcp-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-gcp-fipsUbuntu

Fixed in:6.8.0-1047.50+fips1USN-8031-2

linux-image-gcp-fips-6.8Ubuntu

Fixed in:6.8.0-1047.50+fips1USN-8031-2

linux-image-gcp-lts-24.04Ubuntu

Fixed in:6.8.0-1047.50USN-8031-3

linux-image-genericUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-generic-6.8Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

Fixed in:6.8.0-100.100USN-8028-1

linux-image-generic-64kUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-generic-64k-6.8Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

Fixed in:6.8.0-100.100USN-8028-1

linux-image-generic-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-generic-hwe-22.04Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-generic-lpaeUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-gkeUbuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-gke-6.8Ubuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-gke-64kUbuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-gke-64k-6.8Ubuntu

Fixed in:6.8.0-1043.48USN-8031-3

linux-image-gkeopUbuntu

Fixed in:6.8.0-1030.33USN-8028-5

linux-image-gkeop-6.8Ubuntu

Fixed in:6.8.0-1030.33USN-8028-5

linux-image-ibmUbuntu

Fixed in:6.8.0-1044.44USN-8028-8

linux-image-ibm-6.8Ubuntu

Fixed in:6.8.0-1044.44~22.04.1USN-8028-8

Fixed in:6.8.0-1044.44USN-8028-8

linux-image-ibm-classicUbuntu

Fixed in:6.8.0-1044.44USN-8028-8

linux-image-ibm-lts-24.04Ubuntu

Fixed in:6.8.0-1044.44USN-8028-8

linux-image-intel-iot-realtimeUbuntu

Fixed in:6.8.1-1041.42USN-8028-3

linux-image-intel-iotgUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-kvmUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-lowlatencyUbuntu

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-lowlatency-6.8Ubuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-lowlatency-64kUbuntu

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-lowlatency-64k-6.8Ubuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

Fixed in:6.8.0-100.100.1USN-8052-1

linux-image-lowlatency-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

linux-image-lowlatency-hwe-22.04Ubuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

linux-image-nvidiaUbuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-nvidia-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-nvidia-64kUbuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-nvidia-64k-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

Fixed in:6.8.0-1046.49USN-8028-5

linux-image-nvidia-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-image-nvidia-hwe-22.04Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-image-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-nvidia-lowlatency-6.8Ubuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-nvidia-lowlatency-64k-6.8Ubuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-image-oem-22.04Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-oem-22.04aUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-oem-22.04bUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-oem-22.04cUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-oem-22.04dUbuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-oracleUbuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

linux-image-oracle-6.8Ubuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-oracle-64kUbuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

linux-image-oracle-64k-6.8Ubuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-oracle-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-oracle-lts-24.04Ubuntu

Fixed in:6.8.0-1043.44USN-8028-5

linux-image-raspiUbuntu

Fixed in:6.8.0-1047.51USN-8028-1

linux-image-raspi-6.8Ubuntu

Fixed in:6.8.0-1047.51USN-8028-1

linux-image-raspi-realtimeUbuntu

Fixed in:6.8.0-2037.38USN-8028-3

linux-image-raspi-realtime-6.8Ubuntu

Fixed in:6.8.0-2037.38USN-8028-3

linux-image-realtimeUbuntu

Fixed in:6.8.1-1041.42USN-8028-3

linux-image-realtime-6.8.1Ubuntu

Fixed in:6.8.1-1041.42~22.04.1USN-8028-2

Fixed in:6.8.1-1041.42USN-8028-3

linux-image-realtime-hwe-22.04Ubuntu

Fixed in:6.8.1-1041.42~22.04.1USN-8028-2

linux-image-virtualUbuntu

Fixed in:6.8.0-100.100USN-8028-1

linux-image-virtual-6.8Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

Fixed in:6.8.0-100.100USN-8028-1

linux-image-virtual-hwe-22.04Ubuntu

Fixed in:6.8.0-100.100~22.04.1USN-8028-6

linux-image-xilinxUbuntu

Fixed in:6.8.0.1023.24USN-8052-2

linux-image-xilinx-6.8Ubuntu

Fixed in:6.8.0.1023.24USN-8052-2

linux-image-xilinx-zynqmpUbuntu

Fixed in:6.8.0.1023.24USN-8052-2

linux-lowlatencyUbuntu

Fixed in:6.8.0-100.100.1USN-8052-1

linux-lowlatency-hwe-6.8Ubuntu

Fixed in:6.8.0-100.100.1~22.04.1USN-8028-6

linux-nvidiaUbuntu

Fixed in:6.8.0-1046.49USN-8028-5

linux-nvidia-6.8Ubuntu

Fixed in:6.8.0-1046.49~22.04.1USN-8028-5

linux-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1046.49.1USN-8028-7

linux-oracleUbuntu

Fixed in:6.8.0-1043.44USN-8028-5

linux-oracle-6.8Ubuntu

Fixed in:6.8.0-1043.44~22.04.1USN-8028-5

linux-raspiUbuntu

Fixed in:6.8.0-1047.51USN-8028-1

linux-raspi-realtimeUbuntu

Fixed in:6.8.0-2037.38USN-8028-3

linux-realtimeUbuntu

Fixed in:6.8.1-1041.42USN-8028-3

linux-realtime-6.8Ubuntu

Fixed in:6.8.1-1041.42~22.04.1USN-8028-2

linux-xilinxUbuntu

Fixed in:6.8.0-1023.24USN-8052-2

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

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Patch5

Third-Party Advisory1

lists.debian.org

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 2025-11-12.