net: ethtool: phy: avoid NULL deref when PHY driver is unbound

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Summary

CVECVE-2026-64228
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:51 UTC
Updated2026-07-24 16:16:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: ethtool: phy: avoid NULL deref when PHY driver is unbound phydev->drv can become NULL while the phy_device is still attached to its net_device, namely after the PHY driver is unbound via sysfs: echo <mdio_id> > /sys/bus/mdio_bus/drivers/<phy_drv>/unbind phy_remove() clears phydev->drv but doesn't call phy_detach(), so the phy_device stays in the link topology xarray and ethnl_req_get_phydev() still hands it back. ETHTOOL_MSG_PHY_GET then oopses on: rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL); drvname is already treated as optional by phy_reply_size(), phy_fill_reply() and phy_cleanup_data(), so just skip the allocation when there is no driver bound.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 3586924625559e6f9876d726c80ff0a75f0d5849 git Not specified
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 17fe2381f967d353183f374a1c0181a6d194158c git Not specified
CNA Linux Linux affected 9dd2ad5e92b962d1349a7541d167e8e214e49f95 e3adf69f8eb121a9128c2b0029efd050d3649153 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/17fe2381f967d353183f374a1c0181a6d194158c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e3adf69f8eb121a9128c2b0029efd050d3649153 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3586924625559e6f9876d726c80ff0a75f0d5849 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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