CVE-2026-46323
Description
In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06
- https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1
- https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a
- https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40
- https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.