Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.13, < 5.15.200 |
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2026-23206?
CVE-2026-23206 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 block...
How severe is CVE-2026-23206?
CVE-2026-23206 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23206?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.