CVE-2026-64120

In the Linux kernel, the following vulnerability has been resolved: net: ethtool: fix NULL pointer dereference in phy_reply_size In phy_prepare_data(), several strings such as 'name', 'drvname', 'upstream_sfp_name', and 'downstream_sfp_name' are allocated using kstrdup(). However, these allocations were not checked for failure. If kstrdup() fails for 'name', it returns NULL while the function continues. This leads to a kernel NULL pointer dereference and panic later in phy_reply_size() when it unconditionally calls strlen() on the NULL pointer. While other strings like 'upstream_sfp_name' might be checked before access in certain code paths, failing to handle these allocations consistently can lead to incomplete data reporting or hidden bugs. Fix this by adding proper NULL checks for all kstrdup() calls in phy_prepare_data() and implement a centralized error handling path using goto labels to ensure all previously allocated resources are freed on failure.

• CWE-476

• https://git.kernel.org/stable/c/3dbe20a3809347bacda890822e7ca013bd85a18cPatch
• https://git.kernel.org/stable/c/4908f1395fb1b832ceec11584af649874a2732eaPatch
• https://git.kernel.org/stable/c/61f53c1e58d68723bc1db10912a53f1991f08719Patch

Published

Jul 19, 2026

Last Modified

Aug 13, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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