CVE-2022-49134

Summary

In the Linux kernel, the following vulnerability has been resolved:

mlxsw: spectrum: Guard against invalid local ports

When processing events generated by the device's firmware, the driver protects itself from events reported for non-existent local ports, but not for the CPU port (local port 0), which exists, but does not have all the fields as any local port.

This can result in a NULL pointer dereference when trying access 'struct mlxsw_sp_port' fields which are not initialized for CPU port.

Commit 63b08b1f6834 ("mlxsw: spectrum: Protect driver from buggy firmware") already handled such issue by bailing early when processing a PUDE event reported for the CPU port.

Generalize the approach by moving the check to a common function and making use of it in all relevant places.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux28b1987ef5064dd5c43538ba1168ef7b801f3cad < 4cad27ba2e5a5843a7fab5aa30de2b8e8c3db3a8affected
LinuxLinux28b1987ef5064dd5c43538ba1168ef7b801f3cad < bcdfd615f83b4bd04678109bf18022d1476e4bbfaffected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.17.3 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References