CVE-2024-42282

Summary

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

net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling

Move the freeing of the dummy net_device from mtk_free_dev() to mtk_remove().

Previously, if alloc_netdev_dummy() failed in mtk_probe(), eth->dummy_dev would be NULL. The error path would then call mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev was allocated (but it was not), potentially causing a NULL pointer dereference.

By moving free_netdev() to mtk_remove(), we ensure it's only called when mtk_probe() has succeeded and dummy_dev is fully allocated. This addresses a potential NULL pointer dereference detected by Smatch[1].

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb209bd6d0bffb8991aba568e2d9a892c86a1a43c < af6bd5c9901b13a26eaf4d57d97a813297791596affected
LinuxLinuxb209bd6d0bffb8991aba568e2d9a892c86a1a43c < 16f3a28cf5f876a7f3550d8f4c870a7b41bcfaefaffected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.10.3 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References