CVE-2026-74703
Description
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.
How to fix
- Linux Linux2417a498cf3fe64d06faf87e236eda98dd4f04e0, f8fe3f8d342da750dd10361bf66009fd3072926b, d876c493fc4b811941bfeb4c80beb2dfc4bf025e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | bca939d5bcd00d6faea99c47eafd60bed573ef03 ≤ v < 2417a498cf3fe64d06faf87e236eda98dd4f04e0, bca939d5bcd00d6faea99c47eafd60bed573ef03 ≤ v < f8fe3f8d342da750dd10361bf66009fd3072926b, bca939d5bcd00d6faea99c47eafd60bed573ef03 ≤ v < d876c493fc4b811941bfeb4c80beb2dfc4bf025e, 6.15 | 2417a498cf3fe64d06faf87e236eda98dd4f04e0, f8fe3f8d342da750dd10361bf66009fd3072926b, d876c493fc4b811941bfeb4c80beb2dfc4bf025e |
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