CVE-2026-31736

Summary

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

net: ethernet: mtk_ppe: avoid NULL deref when gmac0 is disabled

If the gmac0 is disabled, the precheck for a valid ingress device will cause a NULL pointer deref and crash the system. This happens because eth->netdev[0] will be NULL but the code will directly try to access netdev_ops.

Instead of just checking for the first net_device, it must be checked if any of the mtk_eth net_devices is matching the netdev_ops of the ingress device.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux73cfd947dbdb25ef9863ac49c4596a7d53ad4025 < 0b832aad33e6f160fda310f0306a6483d85e9d6eaffected
LinuxLinux73cfd947dbdb25ef9863ac49c4596a7d53ad4025 < 5dff799c677152dde963c3917bacd9127b03e145affected
LinuxLinux73cfd947dbdb25ef9863ac49c4596a7d53ad4025 < 7b2380f0a0e374010c1a4a13203511b9dee5b166affected
LinuxLinux73cfd947dbdb25ef9863ac49c4596a7d53ad4025 < 976ff48c2ac6e6b25b01428c9d7997bcd0fb2949affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References