Bug 2347953 (CVE-2022-49076)

Summary: CVE-2022-49076 kernel: RDMA/hfi1: Fix use-after-free bug for mm struct
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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This vulnerability affects the Linux kernel's RDMA (Remote Direct Memory Access) subsystem, specifically the hfi1 driver. It arises from a use-after-free condition involving the memory management (mm) structure.
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Description OSIDB Bzimport 2025-02-26 03:12:30 UTC 
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 MPI_Abort, the hfi1 cleanup code may
represent the last reference held on the task mm.
hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed
before the final use in hfi1_release_user_pages().  A new task may
allocate the mm structure while it is still being used, resulting in
problems. One manifestation is corruption of the mmap_sem counter leading
to a hang in down_write().  Another is corruption of an mm struct that is
in use by another task.
Comment 1 Avinash Hanwate 2025-02-26 14:06:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022656-CVE-2022-49076-cddc@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 18:26:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022656-CVE-2022-49076-cddc@gregkh/T