CVE-2026-89509

Summary

In the Linux kernel, the following vulnerability has been resolved:

RDMA/ionic: Embed counter driver data in rdma_counter allocation

Commit 7e53b31acc7f ("RDMA/core: Create and destroy rdma_counter using rdma_zalloc_drv_obj()") requires drivers implementing counter ops to embed struct rdma_counter in a driver-specific struct, register its size via INIT_RDMA_OBJ_SIZE, and provide a counter_init callback.

The ionic driver was merged without this adaptation, causing a NULL pointer dereference in alloc_and_bind() since rdma_zalloc_drv_obj() allocates zero bytes when size_rdma_counter is unset.

Consolidate struct ionic_counter into a new struct ionic_rdma_counter that embeds struct rdma_counter, replace the xarray with a lightweight ida for ID allocation, and add the required counter_init and INIT_RDMA_OBJ_SIZE declarations.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxea4c399642b85dc30f44d90ee805c6a18fa03062 < c98197ee3cd28288da13dc9881bb9e74daa7cbbcaffected
LinuxLinuxea4c399642b85dc30f44d90ee805c6a18fa03062 < 08b8630b557828aedb1d9ef0a6e2ec421f334ee2affected
LinuxLinuxea4c399642b85dc30f44d90ee805c6a18fa03062 < cf3ebd89e754015625fee90aa938f6bc79a2c974affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References