CVE-2026-23206
Description
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.
How to fix
- linux linux_kernel5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10 or later
- git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af
- git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2b
- git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60
- git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3
- git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6f
- git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.13 ≤ v < 5.15.200, 5.16 ≤ v < 6.1.163, 6.2 ≤ v < 6.6.124, 6.7 ≤ v < 6.12.70, 6.13 ≤ v < 6.18.10, 6.19 | 5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10 |
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