CVE-2025-39971Network attack vector

Guest-triggered memory corruption via queue index misvalidation

Published Oct 15, 2025 · Updated Oct 15, 2025

Out-of-bounds access in Linux kernel i40e allows guest OS users to corrupt memory via a crafted virtual-function queue configuration. In i40e_vc_config_queues_msg(), ADq queue mapping validates an attacker-controlled traffic-class index against the full vf->ch array rather than vf->num_tc, then dereferences an uninitialized channel entry. The path requires an active i40e SR-IOV virtual function with ADq enabled; successful misuse can corrupt memory or crash the host kernel.

CVSS severity7.6
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux kernel i40e allows guest OS users to corrupt memory via a crafted virtual-function queue configuration. In i40e_vc_config_queues_msg(), ADq queue mapping validates an attacker-controlled traffic-class index against the full vf->ch array rather than vf->num_tc, then dereferences an uninitialized channel entry. The path requires an active i40e SR-IOV virtual function with ADq enabled; successful misuse can corrupt memory or crash the host kernel.

The record

CVE
CVE-2025-39971
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.17
  2. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <1fa0aadade34481c567cdf4a897c0d4e4d548bd1
  3. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <2cc26dac0518d2fa9b67ec813ee60e183480f98a
  4. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <5c1f96123113e0bdc6d8dc2b0830184c93da9f65
  5. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <8b9c7719b0987b1c6c5fc910599f3618a558dbde
  6. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <a6ff2af78343eceb0f77ab1a2fe802183bc21648
  7. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <bfcc1dff429d4b99ba03e40ddacc68ea4be2b32b
  8. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f1ad24c5abe1eaef69158bac1405a74b3c365115
  9. Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f5f91d164af22e7147130ef8bebbdb28d8ecc6e2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <1fa0aadade34481c567cdf4a897c0d4e4d548bd1; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <2cc26dac0518d2fa9b67ec813ee60e183480f98a; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <5c1f96123113e0bdc6d8dc2b0830184c93da9f65; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <8b9c7719b0987b1c6c5fc910599f3618a558dbde; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <a6ff2af78343eceb0f77ab1a2fe802183bc21648; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <bfcc1dff429d4b99ba03e40ddacc68ea4be2b32b; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f1ad24c5abe1eaef69158bac1405a74b3c365115; version=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f5f91d164af22e7147130ef8bebbdb28d8ecc6e2

Published CVSS scores

7.6Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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