PT-2026-47760 · Linux · Linux

Published 2026-06-09 · Updated 2026-06-09 · CVE-2026-46323

Mitre

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.

Related Identifiers

CVE-2026-46323

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46323 · Security Note
• https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40 · Note
• https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1 · Note
• https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06 · Note
• https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a · Note
• https://git.kernel.org/stable/c/e334cbf3388fd9334503a778a82d9e9f14dd2f71 · Note