CVE-2026-23206

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.

• linux linux kernel (>= 5.13 < 5.15.200) • linux linux kernel (>= 5.16 < 6.1.163) • linux linux kernel (>= 6.2 < 6.6.124) • linux linux kernel (>= 6.7 < 6.12.70) • linux linux kernel (>= 6.13 < 6.18.10) • linux linux kernel 6.19