Linux Kernel up to 7.1.7 idpf idpf_get_reg_intr_vecs reg_vals out-of-bounds write

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.7 and classified as very critical. This vulnerability affects the function idpf_get_reg_intr_vecs of the component idpf. Executing a manipulation of the argument reg_vals can lead to out-of-bounds write. This vulnerability is tracked as CVE-2026-80693. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.1.7 and classified as very critical. This vulnerability affects the function idpf_get_reg_intr_vecs of the component idpf. The manipulation of the argument reg_vals with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-80693 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/28/2026).

Upgrading to version 7.1.8 eliminates this vulnerability. Applying the patch 41bb8748124d0d8ee5d8e1eace9dfbc874bc9564/9f7007ee9858c99aa43101bc8352c672fee85644 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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