CVE-2026-23206

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6afPatch
• https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2bPatch
• https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60Patch
• https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3Patch
• https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6fPatch
• https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66Patch