CVE-2019-19045

A memory leak in the mlx5_fpga_conn_create_cq() function in drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c in the Linux kernel before 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering mlx5_vector2eqn() failures, aka CID-c8c2a057fdc7.

Weakness

The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11
• https://github.com/torvalds/linux/commit/c8c2a057fdc7de1cd16f4baa51425b932a42eb39
• https://security.netapp.com/advisory/ntap-20191205-0001/
• https://usn.ubuntu.com/4225-1/
• https://usn.ubuntu.com/4225-2/
• https://usn.ubuntu.com/4226-1/
• https://usn.ubuntu.com/4227-1/
• https://usn.ubuntu.com/4227-2/