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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-46323

net: gro: don't merge zcopy skbs

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Status
Published
Published
Updated
Assigning organization
Linux

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8daffected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < 1f9c828556416fbe3f49386708ce999fc4d4da06affected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < 479084ae0e1d9cb7929cb4298d35623de189f80aaffected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < e334cbf3388fd9334503a778a82d9e9f14dd2f71affected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < 44bea2032af0425e4ce6d26a8af0ede79db49ec1affected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc to < 4db79a322db8c97f7b73b8a347395ef4d685eb40affected

Linux Linux

Default version status: affected

  • 6.0affected
  • 0 to < 6.0unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.142 to ≤ 6.6.*unaffected
  • 6.12.92 to ≤ 6.12.*unaffected
  • 6.18.34 to ≤ 6.18.*unaffected
  • 7.0.11 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References