Is CVE-2025-21670 in the CISA KEV catalog?

No. CVE-2025-21670 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-21670?

CVE-2025-21670 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2025-21670?

CVE-2025-21670 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-21670?

Upgrade linux on debian 13 to 6.12.11-1 or later. Fixes are available for 123 affected products.

CVE & CISA-KEV Catalog

CVE-2025-21670

MEDIUM

5.5

CVSS v3

NVD

Description

In the Linux kernel, the following vulnerability has been resolved: vsock/bpf: return early if transport is not assigned Some of the core functions can only be called if the transport has been assigned. As Michal reported, a socket might have the transport at NULL, for example after a failed connect(), causing the following trace: BUG: kernel NULL pointer dereference, address: 00000000000000a0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+ RIP: 0010:vsock_connectible_has_data+0x1f/0x40 Call Trace: vsock_bpf_recvmsg+0xca/0x5e0 sock_recvmsg+0xb9/0xc0 __sys_recvfrom+0xb3/0x130 __x64_sys_recvfrom+0x20/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e So we need to check the `vsk->transport` in vsock_bpf_recvmsg(), especially for connected sockets (stream/seqpacket) as we already do in __vsock_connectible_recvmsg().

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

linuxDebian

Fixed in:6.12.11-1CVE-2025-21670

linuxUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-awsUbuntu

Fixed in:6.8.0-1030.32USN-7595-1

linux-aws-6.8Ubuntu

Fixed in:6.8.0-1030.32~22.04.1USN-7595-1

linux-azureUbuntu

Fixed in:6.8.0-1030.35USN-7596-1

linux-azure-6.11Ubuntu

Fixed in:6.11.0-1013.13~24.04.1USN-7448-1

linux-azure-6.8Ubuntu

Fixed in:6.8.0-1030.35~22.04.1USN-7596-1

linux-azure-nvidiaUbuntu

Fixed in:6.8.0-1018.19USN-7596-2

linux-gcpUbuntu

Fixed in:6.8.0-1031.33USN-7595-5

linux-gcp-6.8Ubuntu

Fixed in:6.8.0-1031.33~22.04.1USN-7595-5

linux-gkeUbuntu

Fixed in:6.8.0-1026.30USN-7595-1

linux-gkeopUbuntu

Fixed in:6.8.0-1013.15USN-7595-1

linux-hwe-6.11Ubuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-hwe-6.8Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-ibmUbuntu

Fixed in:6.8.0-1027.27USN-7595-1

linux-image-6.11.0-1012-lowlatencyUbuntu

Fixed in:6.11.0-1012.13~24.04.1USN-7445-1

linux-image-6.11.0-1012-lowlatency-64kUbuntu

Fixed in:6.11.0-1012.13~24.04.1USN-7445-1

linux-image-6.11.0-1013-azureUbuntu

Fixed in:6.11.0-1013.13~24.04.1USN-7448-1

linux-image-6.11.0-1013-azure-fdeUbuntu

Fixed in:6.11.0-1013.13~24.04.1USN-7448-1

linux-image-6.11.0-1020-oemUbuntu

Fixed in:6.11.0-1020.20USN-7445-1

linux-image-6.11.0-24-genericUbuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-image-6.11.0-24-generic-64kUbuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-image-6.8.0-1013-gkeopUbuntu

Fixed in:6.8.0-1013.15USN-7595-1

linux-image-6.8.0-1018-azure-nvidiaUbuntu

Fixed in:6.8.0-1018.19USN-7596-2

linux-image-6.8.0-1026-gkeUbuntu

Fixed in:6.8.0-1026.30USN-7595-1

linux-image-6.8.0-1027-ibmUbuntu

Fixed in:6.8.0-1027.27USN-7595-1

linux-image-6.8.0-1027-oracleUbuntu

Fixed in:6.8.0-1027.28~22.04.1USN-7595-4

Fixed in:6.8.0-1027.28USN-7595-4

linux-image-6.8.0-1027-oracle-64kUbuntu

Fixed in:6.8.0-1027.28~22.04.1USN-7595-4

Fixed in:6.8.0-1027.28USN-7595-4

linux-image-6.8.0-1029-nvidiaUbuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

Fixed in:6.8.0-1029.32USN-7595-1

linux-image-6.8.0-1029-nvidia-64kUbuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

Fixed in:6.8.0-1029.32USN-7595-1

linux-image-6.8.0-1029-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1029.32.1USN-7595-1

linux-image-6.8.0-1029-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1029.32.1USN-7595-1

linux-image-6.8.0-1029-oemUbuntu

Fixed in:6.8.0-1029.29USN-7595-1

linux-image-6.8.0-1029-raspiUbuntu

Fixed in:6.8.0-1029.33USN-7595-4

linux-image-6.8.0-1030-awsUbuntu

Fixed in:6.8.0-1030.32~22.04.1USN-7595-1

Fixed in:6.8.0-1030.32USN-7595-1

linux-image-6.8.0-1030-aws-64kUbuntu

Fixed in:6.8.0-1030.32~22.04.1USN-7595-1

Fixed in:6.8.0-1030.32USN-7595-1

linux-image-6.8.0-1030-azureUbuntu

Fixed in:6.8.0-1030.35~22.04.1USN-7596-1

Fixed in:6.8.0-1030.35USN-7596-1

linux-image-6.8.0-1030-azure-fdeUbuntu

Fixed in:6.8.0-1030.35~22.04.1USN-7596-1

Fixed in:6.8.0-1030.35USN-7596-1

linux-image-6.8.0-1031-gcpUbuntu

Fixed in:6.8.0-1031.33~22.04.1USN-7595-5

Fixed in:6.8.0-1031.33USN-7595-5

linux-image-6.8.0-1031-gcp-64kUbuntu

Fixed in:6.8.0-1031.33~22.04.1USN-7595-5

Fixed in:6.8.0-1031.33USN-7595-5

linux-image-6.8.0-2024-raspi-realtimeUbuntu

Fixed in:6.8.0-2024.25USN-7595-3

linux-image-6.8.0-62-genericUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-6.8.0-62-generic-64kUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-6.8.0-62-lowlatencyUbuntu

Fixed in:6.8.0-62.65.1~22.04.1USN-7595-1

Fixed in:6.8.0-62.65.1USN-7595-1

linux-image-6.8.0-62-lowlatency-64kUbuntu

Fixed in:6.8.0-62.65.1~22.04.1USN-7595-1

Fixed in:6.8.0-62.65.1USN-7595-1

linux-image-6.8.0-64-genericUbuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

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

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-6.8.1-1023-realtimeUbuntu

Fixed in:6.8.1-1023.24USN-7595-2

linux-image-awsUbuntu

Fixed in:6.8.0-1030.32~22.04.1+1USN-7595-1

Fixed in:6.8.0-1030.32+1USN-7595-1

linux-image-aws-64kUbuntu

Fixed in:6.8.0-1030.32~22.04.1+1USN-7595-1

Fixed in:6.8.0-1030.32+1USN-7595-1

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

Fixed in:6.8.0-1030.32+1USN-7595-1

linux-image-aws-lts-24.04Ubuntu

Fixed in:6.8.0-1030.32+1USN-7595-1

linux-image-azureUbuntu

Fixed in:6.8.0-1030.35~22.04.1USN-7596-1

Fixed in:6.11.0-1013.13~24.04.1USN-7448-1

linux-image-azure-fdeUbuntu

Fixed in:6.8.0-1030.35~22.04.1USN-7596-1

Fixed in:6.11.0-1013.13~24.04.1USN-7448-1

linux-image-azure-fde-lts-24.04Ubuntu

Fixed in:6.8.0-1030.35USN-7596-1

linux-image-azure-lts-24.04Ubuntu

Fixed in:6.8.0-1030.35USN-7596-1

linux-image-azure-nvidiaUbuntu

Fixed in:6.8.0-1018.19USN-7596-2

linux-image-gcpUbuntu

Fixed in:6.8.0-1031.33~22.04.1USN-7595-5

linux-image-gcp-64kUbuntu

Fixed in:6.8.0-1031.33~22.04.1USN-7595-5

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

Fixed in:6.8.0-1031.33USN-7595-5

linux-image-gcp-lts-24.04Ubuntu

Fixed in:6.8.0-1031.33USN-7595-5

linux-image-genericUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-generic-6.8Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-generic-64kUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-generic-64k-6.8Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

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

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-generic-64k-hwe-24.04Ubuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-image-generic-hwe-22.04Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-generic-hwe-24.04Ubuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-image-generic-lpaeUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-gkeUbuntu

Fixed in:6.8.0-1026.30USN-7595-1

linux-image-gkeopUbuntu

Fixed in:6.8.0-1013.15USN-7595-1

linux-image-gkeop-6.8Ubuntu

Fixed in:6.8.0-1013.15USN-7595-1

linux-image-ibmUbuntu

Fixed in:6.8.0-1027.27USN-7595-1

linux-image-ibm-classicUbuntu

Fixed in:6.8.0-1027.27USN-7595-1

linux-image-ibm-lts-24.04Ubuntu

Fixed in:6.8.0-1027.27USN-7595-1

linux-image-kvmUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-lowlatencyUbuntu

Fixed in:6.8.0-62.65.1USN-7595-1

linux-image-lowlatency-64kUbuntu

Fixed in:6.8.0-62.65.1USN-7595-1

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

Fixed in:6.8.0-62.65.1~22.04.1USN-7595-1

linux-image-lowlatency-64k-hwe-24.04Ubuntu

Fixed in:6.11.0-1012.13~24.04.1USN-7445-1

linux-image-lowlatency-hwe-22.04Ubuntu

Fixed in:6.8.0-62.65.1~22.04.1USN-7595-1

linux-image-lowlatency-hwe-24.04Ubuntu

Fixed in:6.11.0-1012.13~24.04.1USN-7445-1

linux-image-nvidiaUbuntu

Fixed in:6.8.0-1029.32USN-7595-1

linux-image-nvidia-6.8Ubuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

linux-image-nvidia-64kUbuntu

Fixed in:6.8.0-1029.32USN-7595-1

linux-image-nvidia-64k-6.8Ubuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

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

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

linux-image-nvidia-hwe-22.04Ubuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

linux-image-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1029.32.1USN-7595-1

linux-image-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1029.32.1USN-7595-1

linux-image-oem-22.04Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-oem-22.04aUbuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-oem-22.04bUbuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-oem-22.04cUbuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-oem-22.04dUbuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-oem-24.04Ubuntu

Fixed in:6.8.0-1029.29USN-7595-1

linux-image-oem-24.04aUbuntu

Fixed in:6.8.0-1029.29USN-7595-1

linux-image-oem-24.04bUbuntu

Fixed in:6.11.0-1020.20USN-7445-1

linux-image-oracleUbuntu

Fixed in:6.8.0-1027.28~22.04.1USN-7595-4

Fixed in:6.8.0-1027.28USN-7595-4

linux-image-oracle-64kUbuntu

Fixed in:6.8.0-1027.28~22.04.1USN-7595-4

Fixed in:6.8.0-1027.28USN-7595-4

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

Fixed in:6.8.0-1027.28USN-7595-4

linux-image-oracle-lts-24.04Ubuntu

Fixed in:6.8.0-1027.28USN-7595-4

linux-image-raspiUbuntu

Fixed in:6.8.0-1029.33USN-7595-4

linux-image-raspi-realtimeUbuntu

Fixed in:6.8.0-2024.25USN-7595-3

linux-image-realtimeUbuntu

Fixed in:6.8.1-1023.24USN-7595-2

linux-image-virtualUbuntu

Fixed in:6.8.0-62.65USN-7595-1

linux-image-virtual-6.8Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-virtual-hwe-22.04Ubuntu

Fixed in:6.8.0-64.67~22.04.1USN-7653-1

linux-image-virtual-hwe-24.04Ubuntu

Fixed in:6.11.0-24.24~24.04.1USN-7445-1

linux-lowlatencyUbuntu

Fixed in:6.8.0-62.65.1USN-7595-1

linux-lowlatency-hwe-6.11Ubuntu

Fixed in:6.11.0-1012.13~24.04.1USN-7445-1

linux-lowlatency-hwe-6.8Ubuntu

Fixed in:6.8.0-62.65.1~22.04.1USN-7595-1

linux-nvidiaUbuntu

Fixed in:6.8.0-1029.32USN-7595-1

linux-nvidia-6.8Ubuntu

Fixed in:6.8.0-1029.32~22.04.1USN-7595-1

linux-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1029.32.1USN-7595-1

linux-oem-6.11Ubuntu

Fixed in:6.11.0-1020.20USN-7445-1

linux-oem-6.8Ubuntu

Fixed in:6.8.0-1029.29USN-7595-1

linux-oracleUbuntu

Fixed in:6.8.0-1027.28USN-7595-4

linux-oracle-6.8Ubuntu

Fixed in:6.8.0-1027.28~22.04.1USN-7595-4

linux-raspiUbuntu

Fixed in:6.8.0-1029.33USN-7595-4

linux-raspi-realtimeUbuntu

Fixed in:6.8.0-2024.25USN-7595-3

linux-realtimeUbuntu

Fixed in:6.8.1-1023.24USN-7595-2

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Patch3

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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 2025-10-01.