CVE-2026-64120

CVE CVE-2026-64120EUVD EUVD-2026-45805Published 2026-07-19T15:40:19.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 9dd2ad5e92b962d1349a7541d167e8e214e49f95 <3dbe20a3809347bacda890822e7ca013bd85a18c; patch: 0; 9dd2ad5e92b962d1349a7541d167e8e214e49f95 <4908f1395fb1b832ceec11584af649874a2732ea; patch: 7.1; 9dd2ad5e92b962d1349a7541d167e8e214e49f95 <61f53c1e58d68723bc1db10912a53f1991f08719; patch: 6.18.34; 6.16; patch: 7.0.11

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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