net: ethtool: fix NULL pointer dereference in phy_reply_size

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Summary

CVECVE-2026-64120
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:53 UTC
Updated2026-07-19 16:17:53 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 61f53c1e58d68723bc1db10912a53f1991f08719 git Not specified
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 3dbe20a3809347bacda890822e7ca013bd85a18c git Not specified
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 4908f1395fb1b832ceec11584af649874a2732ea git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/61f53c1e58d68723bc1db10912a53f1991f08719 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3dbe20a3809347bacda890822e7ca013bd85a18c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4908f1395fb1b832ceec11584af649874a2732ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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