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.
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
- Oct 15, 2025CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=4.17
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <1fa0aadade34481c567cdf4a897c0d4e4d548bd1
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <2cc26dac0518d2fa9b67ec813ee60e183480f98a
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <5c1f96123113e0bdc6d8dc2b0830184c93da9f65
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <8b9c7719b0987b1c6c5fc910599f3618a558dbde
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <a6ff2af78343eceb0f77ab1a2fe802183bc21648
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <bfcc1dff429d4b99ba03e40ddacc68ea4be2b32b
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f1ad24c5abe1eaef69158bac1405a74b3c365115
- Affected versionversion=c27eac48160de72dee33d42b5a33cc7b8a2eb1f5 <f5f91d164af22e7147130ef8bebbdb28d8ecc6e2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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