7.8
High
CVE-2026-46323 In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive()…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.1 | earliest → < 7.1 | 7.1 |
| Linux 7.0 | earliest → < 7.0.11 | 7.0.11 |
| Linux 6.18 | earliest → < 6.18.34 | 6.18.34 |
| Linux 6.12 | earliest → < 6.12.92 | 6.12.92 |
| Linux 6.6 | earliest → < 6.6.142 | 6.6.142 |
| Linux 6.1 | earliest → < 6.1.176 | 6.1.176 |
| Linux | 6.0 | No fix stated |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Versions not published | |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Versions not published |
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