CVE-2022-50756

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux943e942e6266f22babee5efeb00f8f672fbff5bd < dfb6d54893d544151e7f480bc44cfe7823f5ad23affected
LinuxLinux943e942e6266f22babee5efeb00f8f672fbff5bd < 9141144b37f30e3e7fa024bcfa0a13011e546ba9affected
LinuxLinux943e942e6266f22babee5efeb00f8f672fbff5bd < e1777b4286e526c58b4ee699344b0ad85aaf83a0affected
LinuxLinux943e942e6266f22babee5efeb00f8f672fbff5bd < b1814724e0d7162bdf4799f2d565381bc2251c63affected
LinuxLinux943e942e6266f22babee5efeb00f8f672fbff5bd < c89a529e823d51dd23c7ec0c047c7a454a428541affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.87 <= 5.15.*unaffected
LinuxLinux6.0.17 <= 6.0.*unaffected
LinuxLinux6.1.3 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References