Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f5396b8a663f7a78ee5b75a47ee524b40795b265 before 1f263235651775f93c15d90c9f25c3f4a4ef6512; affected f5396b8a663f7a78ee5b75a47ee524b40795b265 before 6f5544f53f1e58ea8a49fb9f9158d5793b9205b0; affected f5396b8a663f7a78ee5b75a47ee524b40795b265 before beb05f484a1e4a5a66e3678e4b7f3147f651c080; affected f5396b8a663f7a78ee5b75a47ee524b40795b265 before 5e4d20db5179e83a4948927bc39e489a9a83256d; affected f5396b8a663f7a78ee5b75a47ee524b40795b265 before 58858b8f14803a7eeac297b3ce20f3b21bf2ff66 |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.11 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1f263235651775f93c15d90c9f25c3f4a4ef6512
- https://git.kernel.org/stable/c/6f5544f53f1e58ea8a49fb9f9158d5793b9205b0
- https://git.kernel.org/stable/c/beb05f484a1e4a5a66e3678e4b7f3147f651c080
- https://git.kernel.org/stable/c/5e4d20db5179e83a4948927bc39e489a9a83256d
- https://git.kernel.org/stable/c/58858b8f14803a7eeac297b3ce20f3b21bf2ff66