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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < 2fcccca88456b592bd668db13aa1d29ed257ca2baffected
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < 80165ff16051448d6f840585ebe13f2400415df3affected
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < b97415c4362f739e25ec6f71012277086fabdf6faffected
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < 4acc40db06ffd0fd92683505342b00c8a7394c60affected
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < 155eb99aff2920153bf21217ae29565fff81e6afaffected
LinuxLinux0b1b71370458860579831e77485883fcf2e8fbbe < ed48a84a72fefb20a82dd90a7caa7807e90c6f66affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.200 <= 5.15.*unaffected
LinuxLinux6.1.163 <= 6.1.*unaffected
LinuxLinux6.6.124 <= 6.6.*unaffected
LinuxLinux6.12.70 <= 6.12.*unaffected
LinuxLinux6.18.10 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References