Description

In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix mempool alloc size Convert the max size to bytes to match the units of the divisor that calculates the worst-case number of PRP entries. The result is used to determine how many PRP Lists are required. The code was previously rounding this to 1 list, but we can require 2 in the worst case. In that scenario, the driver would corrupt memory beyond the size provided by the mempool. While unlikely to occur (you'd need a 4MB in exactly 127 phys segments on a queue that doesn't support SGLs), this memory corruption has been observed by kfence.

References 5

• git.kernel.org https://git.kernel.org/stable/c/9141144b37f30e3e7fa024bcfa0a13011e546ba9
• git.kernel.org https://git.kernel.org/stable/c/b1814724e0d7162bdf4799f2d565381bc2251c63
• git.kernel.org https://git.kernel.org/stable/c/c89a529e823d51dd23c7ec0c047c7a454a428541
• git.kernel.org https://git.kernel.org/stable/c/dfb6d54893d544151e7f480bc44cfe7823f5ad23
• git.kernel.org https://git.kernel.org/stable/c/e1777b4286e526c58b4ee699344b0ad85aaf83a0

Remediation