CVE-2026-80693

Received Received - Intake

Buffer Overflow in Linux Kernel idpf Driver

Publication date: 2026-08-28

Last updated on: 2026-08-29

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: idpf: bound interrupt-vector register fill to the allocated array idpf_get_reg_intr_vecs() fills the caller-allocated reg_vals[] array from the VIRTCHNL2_OP_ALLOC_VECTORS reply in adapter->req_vec_chunks, bounding its inner loop only by the per-chunk num_vectors. The array is sized separately: idpf_intr_reg_init() allocates kzalloc_objs(struct idpf_vec_regs, total_vecs) from caps.num_allocated_vectors and only checks the returned count after the fill. The sum of per-chunk num_vectors is never reconciled against total_vecs, so a reply with a small num_allocated_vectors but chunks summing higher writes past the end of reg_vals[]. Impact: a control plane (a PF or hypervisor device model) that returns a VIRTCHNL2_OP_ALLOC_VECTORS reply whose per-chunk num_vectors sum exceeds num_allocated_vectors writes struct idpf_vec_regs entries past the end of the reg_vals kmalloc allocation (KASAN slab-out-of-bounds write). Bound the fill loop to the array capacity passed in by the callers, mirroring the sibling idpf_vport_get_q_reg(). The existing num_regs < num_vecs check then rejects an undersized reply without the out-of-bounds write happening first.

CVSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-08-29

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-80693

EUVD

EUVD-2026-67428

Affected Vendors & Products

Vendor	Product	Version / Range
intel	idpf	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a buffer overflow in the idpf driver. A control plane or hypervisor can send a malicious reply with per-chunk vector counts that exceed the allocated array size. This causes the driver to write past the end of the allocated memory when filling the reg_vals array, leading to a slab-out-of-bounds write.

Detection Guidance

This vulnerability involves a kernel-level out-of-bounds write in the idpf driver. Detection requires checking for kernel logs indicating slab-out-of-bounds errors or KASAN reports related to idpf. Monitor dmesg for errors like 'KASAN: slab-out-of-bounds' or 'idpf' warnings. No specific commands are provided in the context.

Impact Analysis

This vulnerability can lead to memory corruption, crashes, or potential privilege escalation if exploited. Systems using the affected Linux kernel driver may experience instability or security breaches due to the out-of-bounds write.

Compliance Impact

This vulnerability could potentially impact compliance with standards like GDPR or HIPAA by enabling unauthorized memory writes through a slab-out-of-bounds write in the Linux kernel. Such memory corruption may lead to data leaks, privilege escalation, or system instability, which could violate data integrity and confidentiality requirements under these regulations.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve this vulnerability. Monitor vendor advisories for idpf driver updates and apply them promptly.

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