CVE-2026-74703

Summary

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

vhost-scsi: Validate T10 PI scatterlist counts

When T10 PI is negotiated, vhost-scsi splits protection bytes from the data iterator before mapping the request scatterlists. A malformed request can claim protection bytes that cover or exceed the full payload length. The former leaves no data bytes to map, while the latter underflows exp_data_len before advancing the iterator. Both cases can let a zero data SGL count reach sg_alloc_table_chained(), which triggers BUG_ON(!nents).

Reject protection lengths that cover or exceed the payload before subtracting prot_bytes and advancing the iterator. Also propagate negative errors from the protection SGL calculation before calling the allocator, matching the data SGL path.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/2417a498cf3fe64d06faf87e236eda98dd4f04e0
• https://git.kernel.org/stable/c/f8fe3f8d342da750dd10361bf66009fd3072926b
• https://git.kernel.org/stable/c/d876c493fc4b811941bfeb4c80beb2dfc4bf025e

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