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cve-program · CVE-2026-99043
Published
ice: fix metadata_dst refcount handling on representor teardown
In the Linux kernel, the following vulnerability has been resolved:
ice: fix metadata_dst refcount handling on representor teardown
ice_eswitch_release_repr() uses metadata_dst_free() to release the
representor's metadata_dst. metadata_dst_free() directly frees the
underlying memory without checking the dst_entry refcount.
When ice_eswitch_port_start_xmit() processes a packet, it takes a
reference via dst_hold() and attaches the metadata_dst to the skb.
If the representor is torn down while packets are still queued on
the lower device (e.g. in a qdisc), the metadata_dst is freed while
references are still held.
Use dst_release() instead, which correctly decrements the refcount
and only frees the object when all references are dropped. The dst
subsystem already handles metadata_dst cleanup in dst_destroy() when
DST_METADATA is set.
Other drivers sharing this pattern (nfp, airoha, bnxt) already use
dst_release() for their metadata_dst lifecycle.
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