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Fencer Vulns
high 8.8

CVE-2025-39973 json

i40e: add validation for ring_len param

published 2025-10-15 12 mo ago modified 2026-10-19 20 d ago also EUVD-2025-34599

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

i40e: add validation for ring_len param

The `ring_len` parameter provided by the virtual function (VF) is assigned directly to the hardware memory context (HMC) without any validation.

To address this, introduce an upper boundary check for both Tx and Rx queue lengths. The maximum number of descriptors supported by the hardware is 8k-32. Additionally, enforce alignment constraints: Tx rings must be a multiple of 8, and Rx rings must be a multiple of 32.

Patch / fix

  • Linux Linux 5.4.300, 5.10.245, 5.15.194, 6.1.155, 6.6.109, 6.12.50, 6.16.10, 6.17
  • linux Debian 12 6.1.158-1
  • linux Debian 13 6.12.57-1
  • linux Debian 14 6.16.10-1

debian advisories DEBIAN-CVE-2025-39973

  • linux Ubuntu 22.04 LTS 5.15.0-170.180
  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux Ubuntu 25.10 6.17.0-6.6
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1100.107
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-aws Ubuntu 25.10 6.17.0-1003.3
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1100.109
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55

ubuntu advisories UBUNTU-CVE-2025-39973

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.1 6.12.0-124.16.1.el10_1
  • rv RHEL 10.1 6.12.0-124.16.1.el10_1
  • perf RHEL 10.1 6.12.0-124.16.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.16.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.16.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.16.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.16.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.16.1.el10_1

red hat advisories RHSA-2026:1623RHSA-2026:1581RHSA-2026:1445RHSA-2026:0643RHSA-2026:0536RHSA-2026:0173

  • kernel-livepatch-SLE16_Update_1 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 7-160000.1.1
  • kernel-livepatch-SLE16_Update_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 9-160000.4.3
  • kernel-livepatch-MICRO-6-0-RT_Update_6 Linux Micro 6.1, Linux Micro 6.0 15-3.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.1, Linux Micro 6.0 17-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_8 Linux Micro 6.1, Linux Micro 6.0 14-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_7 Linux Micro 6.1 15-1.3
  • kgraft-patch-SLE12-SP5_Update_73 SLE Live Patching 12 SP5 6-2.1
  • kgraft-patch-SLE12-SP5_Update_72 SLE Live Patching 12 SP5 8-2.1

suse advisories SUSE-SU-2026:1304-1SUSE-SU-2026:1298-1SUSE-SU-2026:1297-1SUSE-SU-2026:21099-1SUSE-SU-2026:21219-1SUSE-SU-2026:1287-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.7.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.7.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.7.1

opensuse advisories openSUSE-SU-2025:20091-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.16.1.el10_1
  • kernel AlmaLinux 8 4.18.0-553.85.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.85.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.85.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.85.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.85.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.85.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.85.1.el8_10

almalinux advisories ALSA-2025:22395ALSA-2025:21917ALSA-2025:21920

  • kernel Azure Linux 3.0 6.6.112.1-1

azure linux advisories AZL-68495

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-39973 updated cvss 7.5

kernel: i40e: add validation for ring_len param

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.