net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops

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Summary

CVECVE-2026-53323
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 20:17:25 UTC
Updated2026-06-26 20:17:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops DSA replaces the conduit (master) device's ethtool_ops with its own wrappers that aggregate stats from both the conduit and DSA switch ports. Taking the lock again inside the DSA wrappers causes a deadlock. Stumbled upon this when booting qemu with fbnic and CONFIG_NET_DSA_LOOP=y (which looks like some kind of testing device that auto-populates the ports of eth0). `ethtool -i` is enough to deadlock. This means we have basically zero coverage for DSA stuff with real ops locked devs. Remove the redundant netdev_lock_ops()/netdev_unlock_ops() calls from the DSA conduit ethtool wrappers.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2bcf4772e45adb00649a4e9cbff14b08a144f9e3 74d64ae4254e99ef8c8215b057a76edac82c5f99 git Not specified
CNA Linux Linux affected 2bcf4772e45adb00649a4e9cbff14b08a144f9e3 abe91fd045874d21834482adcd7a9693e7377056 git Not specified
CNA Linux Linux affected 2bcf4772e45adb00649a4e9cbff14b08a144f9e3 0f99e0c3e19badaf3fdced0d3feba623e59eed41 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0f99e0c3e19badaf3fdced0d3feba623e59eed41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74d64ae4254e99ef8c8215b057a76edac82c5f99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/abe91fd045874d21834482adcd7a9693e7377056 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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