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 zeroThe driver allocates arrays for ports, FDBs, and filter blocks usingkcalloc() with ethsw->sw_attr.num_ifs as the element count. When thedevice reports zero interfaces (either due to hardware configurationor firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10)instead of null.Later in dpaa2_switch_probe(), the NAPI initialization unconditionallyaccesses ethsw->ports[0]->netdev, which attempts to dereferenceZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.Add a check to ensure num_ifs is greater than zero after retrievingdevice attributes. This prevents the zero-sized allocations andsubsequent invalid pointer dereference.

Risk Information

Base Score

5.5

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.035

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234