CVE-2026-46323
Vulnerability 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.
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.
Vulnerability Details
Published Date
Last Modified
Source
NVD
Vendor
Linux
Product
Linux
External 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
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