CVE-2022-49076 RDMA/hfi1: Fix use-after-free bug for mm struct

In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPIAbort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1mmurbunregister then drops the last reference and the mm ...

CVE-2022-49076

CVE-2022-49076 concerns the Linux kernel RDMA/hfi1 subsystem. The issue is a use-after-free in the mm struct lifecycle: under certain conditions (e.g., MPI_Abort), hfi1_mmu_rb_unregister() may drop the last reference to a task mm, freeing it before its final use in hfi1_release_user_pages. This c...