CVE-2026-31464

Summary

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

scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory.

Fix by clamping num_written to max_targets before storing it.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3
• https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc
• https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89
• https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161
• https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780
• https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983
• https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db
• https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f

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