net: airoha: Fix use-after-free in metadata dst teardown

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Summary

CVECVE-2026-53248
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:42 UTC
Updated2026-06-25 09:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: airoha: Fix use-after-free in metadata dst teardown airoha_metadata_dst_free() runs metadata_dst_free() which frees the metadata_dst with kfree() immediately, bypassing the RCU grace period. In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from the skb to the metadata_dst. This function requires RCU read-side protection and the dst must remain valid until all RCU readers complete. Since metadata_dst_free() calls kfree() directly, an use-after-free can occur if any skb still holds a noref pointer to the dst when the driver tears it down. Replace metadata_dst_free() with dst_release() which properly goes through the refcount path: when the refcount drops to zero, it schedules the actual free via call_rcu_hurry(), ensuring all RCU readers have completed before the memory is freed.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected af3cf757d5c99011b9b94ea8d78aeaccc0153fdc 6f829e2c17a53a35321268339cd252aff6d6d723 git Not specified
CNA Linux Linux affected af3cf757d5c99011b9b94ea8d78aeaccc0153fdc 4b5a574e033e66d2131eff1c18feef8d8643c67e git Not specified
CNA Linux Linux affected af3cf757d5c99011b9b94ea8d78aeaccc0153fdc b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b5a574e033e66d2131eff1c18feef8d8643c67e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f829e2c17a53a35321268339cd252aff6d6d723 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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